@article{ZinkWernerJechowetal.2014,
  author    = {Zink, Christof and Werner, Nils and Jechow, Andreas and Heuer, Axel and Menzel, Ralf},
  title     = {Multi-wavelength operation of a single broad area diode laser by spectral beam combining},
  series = {IEEE photonics technology letters},
  volume    = {26},
  journal   = {IEEE photonics technology letters},
  number    = {3},
  publisher = {Inst. of Electr. and Electronics Engineers},
  address   = {Piscataway},
  issn      = {1041-1135},
  doi       = {10.1109/LPT.2013.2291963},
  pages     = {253 -- 256},
  year      = {2014},
  abstract  = {Stabilized multi-wavelength emission from a single emitter broad area diode laser (BAL) is realized by utilizing an external cavity with a spectral beam combining architecture. Self-organized emitters that are equidistantly spaced across the slow axis are enforced by the spatially distributed wavelength selectivity of the external cavity. This resulted in an array like near-field emission although the BAL is physically a single emitter without any epitaxial sub-structuring and only one electrical contact. Each of the self-organized emitters is operated at a different wavelength and the emission is multiplexed into one spatial mode with near-diffraction limited beam quality. With this setup, multi-line emission of 31 individual spectral lines centered around and a total spectral width of 3.6 nm is realized with a 1000 mu m wide BAL just above threshold. To the best of our knowledge, this is the first demonstration of such a self-organization of emitters by optical feedback utilizing a spectral beam combining architecture.},
  language  = {en}
}
@article{ZinkNiebuhrJechowetal.2014,
  author    = {Zink, Christof and Niebuhr, Mario and Jechow, Andreas and Heuer, Axel and Menzel, Ralf},
  title     = {Broad area diode laser with on-chip transverse Bragg grating stabilized in an off-axis external cavity},
  series = {Optics express : the international electronic journal of optics},
  volume    = {22},
  journal   = {Optics express : the international electronic journal of optics},
  number    = {12},
  publisher = {Optical Society of America},
  address   = {Washington},
  issn      = {1094-4087},
  doi       = {10.1364/OE.22.014108},
  pages     = {14108 -- 14113},
  year      = {2014},
  abstract  = {The emission characteristics of a novel, specially designed broad area diode laser (BAL) with on-chip transversal Bragg resonance (TBR) grating in lateral direction were investigated in an off-axis external cavity setup. The internal TBR grating defines a low loss transversal mode at a specific angle of incidence and a certain wavelength. By providing feedback at this specific angle with an external mirror, it is possible to select this low loss transverse mode and stabilize the BAL. Near diffraction limited emission with an almost single lobed far field pattern could be realized, in contrast to the double lobed far field pattern of similar setups using standard BALs or phase-locked diode laser arrays. Furthermore, we could achieve a narrow bandwidth emission with a simplified setup without external frequency selective elements. (C) 2014 Optical Society of America},
  language  = {en}
}
@article{vonSeggernModrakowskiSpitzetal.2004,
  author    = {von Seggern, David and Modrakowski, Claudia and Spitz, Christian and Schl{\"u}ter, A. D. and Menzel, Ralf},
  title     = {Charge transfer initiated by optical excitation in diester substituted biphenylpyrene as a function of the solvent characterized by excited state absorption spectroscopy},
  year      = {2004},
  abstract  = {Cross-sections for ground and excited state absorptions of the charge transfer system 3-(3-tert- butoxycarbonylamino-propyl)-4'-pyren-1-yl-biphenyl-2,5-dicarbo xylicacid dimethyl ester (Py-C) are determined from nonlinear absorption and fluorescence measurements as a function of solvent. While in non-polar solvents no stable charge transfer (CT) state occurs after optical excitation, in polar solvents the CT state is stabilized. (C) 2004 Elsevier B.V. All rights reserved},
  language  = {en}
}
@article{UnterhuberPovazayBizhevaetal.2004,
  author    = {Unterhuber, Angelika and Povazay, B. and Bizheva, K. and Hermann, B. and Sattmann, Harald and Stingl, A. and Le, Trang and Seefeldt, Michael and Menzel, Ralf and Preusser, Matthias and Budka, Herbert and Schubert, Christian and Reitsamer, H. and Ahnelt, Peter Kurt and Morgan, J. E.},
  title     = {Advances in broad bandwidth light sources for ultrahigh resolution optical coherence tomography},
  issn      = {0031-9155},
  year      = {2004},
  abstract  = {Novel ultra-broad bandwidth light sources enabling unprecedented sub-2 pm axial resolution over the 400 nm-1700 nm wavelength range have been developed and evaluated with respect to their feasibility for clinical ultrahigh resolution optical coherence tomography (UHR OCT) applications. The state-of-the-art light sources described here include a compact Kerr lens mode locked Ti:sapphire laser (lambda(c) = 785 nm, Deltalambda = 260 nm, P-out = 50 mW) and different nonlinear fibre-based light sources with spectral bandwidths (at full width at half maximum) up to 350 nm at lambda(c) = 1130 nm and 470 nm at lambda(c) = 1375 run. In vitro UHR OCT imaging is demonstrated at multiple wavelengths in human cancer cells, animal ganglion cells as well as in neuropathologic and ophthalmic biopsies in order to compare and optimize UHR OCT image contrast, resolution and penetration depth},
  language  = {en}
}
@article{TedeschiLiMoehwaldetal.2004,
  author    = {Tedeschi, Concetta and Li, L. and M{\"o}hwald, Helmuth and Spitz, Christian and von Seggern, David and Menzel, Ralf and Kirstein, Stefan},
  title     = {Engineering of layer-by-layer coated capsules with the prospect of materials for efficient and directed electron transfer},
  year      = {2004},
  abstract  = {We show a Lefschetz fixed point formula for holomorphic functions in a bounded domain D with smooth boundary in the complex plane. To introduce the Lefschetz number for a holomorphic map of D, we make use of the Bergman kernel of this domain. The Lefschetz number is proved to be the sum of the usual contributions of fixed points of the map in D and contributions of boundary fixed points, these latter being different for attracting and repulsing fixed points},
  language  = {en}
}
@article{SpitzvonSeggernGrunwaldtetal.2002,
  author    = {Spitz, Christian and von Seggern, David and Grunwaldt, Gisela and Menzel, Ralf},
  title     = {Biochemical Diagnostics by Excited State Absorption Spectroscopy},
  isbn      = {0-8194-4365-4},
  year      = {2002},
  language  = {en}
}
@article{SkoczowskyJechowStuermeretal.2010,
  author    = {Skoczowsky, Danilo and Jechow, Andreas and St{\"u}rmer, Herbert and Poßner, Torsten and Sacher, Joachim and Menzel, Ralf},
  title     = {Quasi-monolithic ring resonator for efficient frequency doubling of an external cavity diode laser},
  issn      = {0946-2171},
  doi       = {10.1007/s00340-009-3802-7},
  year      = {2010},
  abstract  = {A quasi-monolithic second-harmonic-generation ring resonator assembled with miniaturized components is presented. The ring contains a 10-mm-long bulk periodically poled lithium niobate crystal for second-harmonic generation, four plane mirrors and two gradient-index lenses. All parts are mounted on a glass substrate with an overall size of 19.5 mmx8.5 mmx4 mm. As pump source a broad-area laser diode operated in an external resonator with Littrow arrangement is utilized. This external cavity diode laser provides near diffraction limited, narrow-bandwidth emission with an optical output power of 450 mW at a wavelength of 976 nm. Locking of the diode laser emission to the resonance frequency of the ring cavity was achieved by an optical self-injection locking technique. With this setup more than 126 mW of diffraction-limited blue light at 488 nm could be generated. The opto-optical conversion efficiency was 28\% and a wall plug efficiency better than 5.5\% could be achieved.},
  language  = {en}
}
@article{SkoczowskyJechowMenzeletal.2010,
  author    = {Skoczowsky, Danilo and Jechow, Andreas and Menzel, Ralf and Paschke, Katrin and Erbert, G{\"o}tz},
  title     = {Efficient second-harmonic generation using a semiconductor tapered amplifier in a coupled ring-resonator geometry},
  issn      = {0146-9592},
  doi       = {10.1364/OL.35.000232},
  year      = {2010},
  abstract  = {A new approach for efficient second-harmonic generation using diode lasers is presented. The experimental setup is based on a tapered amplifier operated in a ring resonator that is coupled to a miniaturized enhancement ring resonator containing a periodically poled lithium niobate crystal. Frequency locking of the diode laser emission to the resonance frequency of the enhancement cavity is realized purely optically, resulting in stable, single-frequency operation. Blue light at 488 nm with an output power of 310 mW is generated with an optical-to-optical conversion efficiency of 18\%.},
  language  = {en}
}
@article{SeefeldtHeuerMenzel2003,
  author    = {Seefeldt, Michael and Heuer, Axel and Menzel, Ralf},
  title     = {Compact white-light source with an average output power of 2.4 W and 900 nm spectral bandwidth},
  year      = {2003},
  language  = {en}
}
@article{SchwarzeGarzTeuchneretal.2014,
  author    = {Schwarze, Thomas and Garz, Andreas and Teuchner, Klaus and Menzel, Ralf and Holdt, Hans-J{\"u}rgen},
  title     = {Two-photon probes for metal ions based on phenylaza[18]crown-6 ethers and 1,2,3-triazoles as pi-linkers},
  series = {ChemPhysChem : a European journal of chemical physics and physical chemistry},
  volume    = {15},
  journal   = {ChemPhysChem : a European journal of chemical physics and physical chemistry},
  number    = {12},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1439-4235},
  doi       = {10.1002/cphc.201402232},
  pages     = {2436 -- 2439},
  year      = {2014},
  language  = {en}
}
@article{SandmannGarzMenzel2016,
  author    = {Sandmann, Michael and Garz, Andreas and Menzel, Ralf},
  title     = {Physiological response of two different Chlamydomonas reinhardtii strains to light-dark rhythms},
  series = {Botany},
  volume    = {94},
  journal   = {Botany},
  publisher = {NRC Research Press},
  address   = {Ottawa},
  issn      = {1916-2790},
  doi       = {10.1139/cjb-2015-0144},
  pages     = {53 -- 64},
  year      = {2016},
  abstract  = {Cells of a cell-wall deficient line (cw15-type) of Chlamydomonas reinhardtii and of the corresponding wild type were grown during repetitive light-dark cycles. In a direct comparison, both lines showed approximately the same relative biomass increase during light phase but the cw-line produced significantly more, and smaller, daughter cells. Throughout the light period the average cellular starch content, the cellular chlorophyll content, the cellular rate of dark respiration, and the cellular rate of photosynthesis of the cw-line was lower. Despite this, several non-cell volume related parameters like the development of starch content per cell volume were clearly different over time between the strains. Additionally, the chlorophyll-based photosynthesis rates were 2-fold higher in the mutant than in the wild-type cells, and the ratio of chlorophyll a to chlorophyll b as well as the light-saturation index were also consistently higher in the mutant cells. Differences in the starch content were also confirmed by single cell analyses using a sensitive SHG-based microscopy approach. In summary, the cw15-type mutant deviates from its genetic background in the entire cell physiology. Both lines should be used in further studies in comparative systems biology with focus on the detailed relation between cell volume increase, photosynthesis, starch metabolism, and daughter cell productivity.},
  language  = {en}
}
@article{SanderHerrmannMenzel1996,
  author    = {Sander, Rolf and Herrmann, V. and Menzel, Ralf},
  title     = {Transient absorption spectra and bleaching of 4'-n-Pentyl-4-Cyanoterphenyl in Cyclohexane : determination of cross sections and recovery times},
  year      = {1996},
  language  = {en}
}
@article{RaetzelWilkensMenzel2017,
  author    = {R{\"a}tzel, Dennis and Wilkens, Martin and Menzel, Ralf},
  title     = {Effect of polarization entanglement in photon-photon scattering},
  series = {Physical review : A, Atomic, molecular, and optical physics},
  volume    = {95},
  journal   = {Physical review : A, Atomic, molecular, and optical physics},
  number    = {1},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {2469-9926},
  doi       = {10.1103/PhysRevA.95.012101},
  pages     = {6},
  year      = {2017},
  abstract  = {It is found that the differential cross section of photon-photon scattering is a function of the degree of polarization entanglement of the two-photon state. A reduced general expression for the differential cross section of photon-photon scattering is derived by applying simple symmetry arguments. An explicit expression is obtained for the example of photon-photon scattering due to virtual electron-positron pairs in quantum electrodynamics. It is shown how the effect in this explicit example can be explained as an effect of quantum interference and that it fits with the idea of distance-dependent forces.},
  language  = {en}
}
@misc{RaetzelWilkensMenzel2016,
  author    = {R{\"a}tzel, Dennis and Wilkens, Martin and Menzel, Ralf},
  title     = {Gravitational properties of light},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-90553},
  year      = {2016},
  abstract  = {The gravitational field of a laser pulse of finite lifetime, is investigated in the framework of linearized gravity. Although the effects are very small, they may be of fundamental physical interest. It is shown that the gravitational field of a linearly polarized light pulse is modulated as the norm of the corresponding electric field strength, while no modulations arise for circular polarization. In general, the gravitational field is independent of the polarization direction. It is shown that all physical effects are confined to spherical shells expanding with the speed of light, and that these shells are imprints of the spacetime events representing emission and absorption of the pulse. Nearby test particles at rest are attracted towards the pulse trajectory by the gravitational field due to the emission of the pulse, and they are repelled from the pulse trajectory by the gravitational field due to its absorption. Examples are given for the size of the attractive effect. It is recovered that massless test particles do not experience any physical effect if they are co-propagating with the pulse, and that the acceleration of massless test particles counter-propagating with respect to the pulse is four times stronger than for massive particles at rest. The similarities between the gravitational effect of a laser pulse and Newtonian gravity in two dimensions are pointed out. The spacetime curvature close to the pulse is compared to that induced by gravitational waves from astronomical sources.},
  language  = {en}
}
@article{RaetzelWilkensMenzel2016,
  author    = {R{\"a}tzel, Dennis and Wilkens, Martin and Menzel, Ralf},
  title     = {Gravitational properties of light},
  series = {New journal of physics : the open-access journal for physics},
  volume    = {18},
  journal   = {New journal of physics : the open-access journal for physics},
  publisher = {IOP Science},
  address   = {London},
  issn      = {1367-2630},
  doi       = {10.1088/1367-2630/18/2/023009},
  pages     = {1 -- 16},
  year      = {2016},
  abstract  = {The gravitational field of a laser pulse of finite lifetime, is investigated in the framework of linearized gravity. Although the effects are very small, they may be of fundamental physical interest. It is shown that the gravitational field of a linearly polarized light pulse is modulated as the norm of the corresponding electric field strength, while no modulations arise for circular polarization. In general, the gravitational field is independent of the polarization direction. It is shown that all physical effects are confined to spherical shells expanding with the speed of light, and that these shells are imprints of the spacetime events representing emission and absorption of the pulse. Nearby test particles at rest are attracted towards the pulse trajectory by the gravitational field due to the emission of the pulse, and they are repelled from the pulse trajectory by the gravitational field due to its absorption. Examples are given for the size of the attractive effect. It is recovered that massless test particles do not experience any physical effect if they are co-propagating with the pulse, and that the acceleration of massless test particles counter-propagating with respect to the pulse is four times stronger than for massive particles at rest. The similarities between the gravitational effect of a laser pulse and Newtonian gravity in two dimensions are pointed out. The spacetime curvature close to the pulse is compared to that induced by gravitational waves from astronomical sources.},
  language  = {en}
}
@article{RaetzelWilkensMenzel2016,
  author    = {R{\"a}tzel, Dennis and Wilkens, Martin and Menzel, Ralf},
  title     = {Gravitational properties of light-the gravitational field of a laser pulse},
  series = {NEW JOURNAL OF PHYSICS},
  volume    = {18},
  journal   = {NEW JOURNAL OF PHYSICS},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {1367-2630},
  doi       = {10.1088/1367-2630/18/2/023009},
  pages     = {16},
  year      = {2016},
  abstract  = {The gravitational field of a laser pulse of finite lifetime, is investigated in the framework of linearized gravity. Although the effects are very small, they may be of fundamental physical interest. It is shown that the gravitational field of a linearly polarized light pulse is modulated as the norm of the corresponding electric field strength, while no modulations arise for circular polarization. In general, the gravitational field is independent of the polarization direction. It is shown that all physical effects are confined to spherical shells expanding with the speed of light, and that these shells are imprints of the spacetime events representing emission and absorption of the pulse. Nearby test particles at rest are attracted towards the pulse trajectory by the gravitational field due to the emission of the pulse, and they are repelled from the pulse trajectory by the gravitational field due to its absorption. Examples are given for the size of the attractive effect. It is recovered that massless test particles do not experience any physical effect if they are co-propagating with the pulse, and that the acceleration of massless test particles counter-propagating with respect to the pulse is four times stronger than for massive particles at rest. The similarities between the gravitational effect of a laser pulse and Newtonian gravity in two dimensions are pointed out. The spacetime curvature close to the pulse is compared to that induced by gravitational waves from astronomical sources.},
  language  = {en}
}
@article{RaetzelWilkensMenzel2016,
  author    = {R{\"a}tzel, Dennis and Wilkens, Martin and Menzel, Ralf},
  title     = {The effect of entanglement in gravitational photon-photon scattering},
  series = {epl : a letters journal exploring the frontiers of physics},
  volume    = {115},
  journal   = {epl : a letters journal exploring the frontiers of physics},
  publisher = {EDP Sciences},
  address   = {Mulhouse},
  issn      = {0295-5075},
  doi       = {10.1209/0295-5075/115/51002},
  pages     = {S12 -- S13},
  year      = {2016},
  abstract  = {The differential cross-section for gravitational photon-photon scattering calculated in perturbative quantum gravity is shown to depend on the degree of polarization entanglement of the two photons. The interaction between photons in the symmetric Bell state is stronger than between not entangled photons. In contrast, the interaction between photons in the anti-symmetric Bell state is weaker than between not entangled photons. The results are interpreted in terms of quantum interference, and it is shown how they fit into the idea of distance-dependent forces. Copyright (C) EPLA, 2016},
  language  = {en}
}
@article{RaetzelWilkensMenzel2017,
  author    = {Raetzel, Dennis and Wilkens, Martin and Menzel, Ralf},
  title     = {Gravitational properties of light: The emission of counter-propagating laser pulses from an atom},
  series = {Physical review : D, Particles, fields, gravitation, and cosmology},
  volume    = {95},
  journal   = {Physical review : D, Particles, fields, gravitation, and cosmology},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {2470-0010},
  doi       = {10.1103/PhysRevD.95.084008},
  pages     = {11},
  year      = {2017},
  language  = {en}
}
@article{RaabUllnerMenzel2000,
  author    = {Raab, Volker and Ullner, Ekkehard and Menzel, Ralf},
  title     = {Novel External Resonators for High Power Diode Lasers with Improved Beam Quality},
  year      = {2000},
  language  = {en}
}
@article{RaabSkoczowskyMenzel2003,
  author    = {Raab, Volker and Skoczowsky, Danilo and Menzel, Ralf},
  title     = {Tuning high-power diodes with as much as 0.38 W of power and M2 = 1.2 over a range of 32 nm with 3-GHz bandwidth},
  year      = {2003},
  language  = {en}
}
@article{RaabMenzel2002,
  author    = {Raab, Volker and Menzel, Ralf},
  title     = {External resonator design for high-power laser diodes that yields 400 mW of TEM00 power},
  year      = {2002},
  language  = {en}
}
@article{RaabMenzel2002,
  author    = {Raab, Volker and Menzel, Ralf},
  title     = {Phase-locked array of 25 broad-area lasers},
  isbn      = {0-8194-4368-9},
  year      = {2002},
  language  = {en}
}
@article{PuhlmannHenkelHeueretal.2016,
  author    = {Puhlmann, Dirk and Henkel, Carsten and Heuer, Axel and Pieplow, Gregor and Menzel, Ralf},
  title     = {Characterization of a remote optical element with bi-photons},
  series = {Physica scripta : an international journal for experimental and theoretical physics},
  volume    = {91},
  journal   = {Physica scripta : an international journal for experimental and theoretical physics},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {0031-8949},
  doi       = {10.1088/0031-8949/91/2/023006},
  pages     = {113 -- 114},
  year      = {2016},
  abstract  = {We present a simple setup that exploits the interference of entangled photon pairs. 'Signal' photons are sent through a Mach-Zehnder-like interferometer, while 'idlers' are detected in a variable polarization state. Two-photon interference (in coincidence detection) is observed with very high contrast and for significant time delays between signal and idler detection events. This is explained by quantum erasure of the polarization tag and a delayed choice protocol involving a non-local virtual polarizer. The phase of the two-photon fringes is scanned by varying the path length in the signal beam or by rotating a birefringent crystal in the idler beam. We exploit this to characterize one beam splitter of the signal photon interferometer (reflection and transmission amplitudes including losses), using only information about coincidences and control parameters in the idler path. This is possible because our bi-photon state saturates the Greenberger-Yelin-Englert inequality between contrast and predictability.},
  language  = {en}
}
@article{OstermeyerMittlerMenzel1999,
  author    = {Ostermeyer, Martin and Mittler, Kay and Menzel, Ralf},
  title     = {Q switch and longitudinal modes of a laser oscillator with a stimulated-Brillouin-scattering mirror},
  year      = {1999},
  language  = {en}
}
@article{OstermeyerMenzel2004,
  author    = {Ostermeyer, Martin and Menzel, Ralf},
  title     = {Laser resonators with brillouin mirrors},
  series = {Phase conjugate laser optics},
  journal   = {Phase conjugate laser optics},
  publisher = {Wiley},
  address   = {Hoboken, NJ},
  isbn      = {0-471-43957-6},
  year      = {2004},
  language  = {en}
}
@article{OstermeyerMenzel1997,
  author    = {Ostermeyer, Martin and Menzel, Ralf},
  title     = {34 Watt flash lamp pumped single rod ND:YAG laser with 1.2 * DL beam quality via special resonator design},
  year      = {1997},
  language  = {en}
}
@article{OstermeyerMenzel1999,
  author    = {Ostermeyer, Martin and Menzel, Ralf},
  title     = {50 Watt average output power with 1.2*DL beam quality from a single rod Nd:YALO laser with phase-conjugating SBS mirror},
  year      = {1999},
  language  = {en}
}
@article{OstermeyerMenzel1999,
  author    = {Ostermeyer, Martin and Menzel, Ralf},
  title     = {Single rod efficient Nd:YAG and Nd:YALO-lasers with average output powers of 46 and 47 W in diffraction limited beams with M2 < 1.2 and 100 W with M2 < 3.7},
  year      = {1999},
  language  = {en}
}
@article{OstermeyerLorenzMenzel1997,
  author    = {Ostermeyer, Martin and Lorenz, Dieter and Menzel, Ralf},
  title     = {Nd-laser oscillators with phase-conjugating SBS mirrors for high average output powers and fundamental mode operation},
  year      = {1997},
  language  = {en}
}
@article{OstermeyerLorenzHodgsonetal.1997,
  author    = {Ostermeyer, Martin and Lorenz, Dieter and Hodgson, N. and Menzel, Ralf},
  title     = {Transverse Modes in Laser Resonators with Phase Conjugating Mirror Based on Stimulated Brillouin Scattering (SBS)},
  year      = {1997},
  language  = {en}
}
@article{OstermeyerKlemzMenzel2002,
  author    = {Ostermeyer, Martin and Klemz, Guido and Menzel, Ralf},
  title     = {Double rod Nd:YAG laser with 180 W average output and diffraction limited beam quality via path-matched birefringence compensation},
  isbn      = {0-8194-4368-9},
  year      = {2002},
  language  = {en}
}
@article{OstermeyerKlemzKubinaetal.2005,
  author    = {Ostermeyer, Martin and Klemz, Guido and Kubina, P. and Menzel, Ralf},
  title     = {Enhanced brightness and extraction efficiency of Nd:YAG rod lasers resulting in 180 W output power with M2<1.2},
  isbn      = {1-557-52697-4},
  year      = {2005},
  language  = {en}
}
@article{OstermeyerKlemzKubinaetal.2002,
  author    = {Ostermeyer, Martin and Klemz, Guido and Kubina, P. and Menzel, Ralf},
  title     = {Quasi-continuous-wave birefringence-compensated single- and double-rod Nd : YAG lasers},
  year      = {2002},
  language  = {en}
}
@article{OstermeyerKlemzHeueretal.2002,
  author    = {Ostermeyer, Martin and Klemz, Guido and Heuer, Axel and Menzel, Ralf},
  title     = {High Brightness Double and Single Rod Nd:YAG Laser Oscillators with up to 180 W and M2 < 1.2},
  year      = {2002},
  language  = {en}
}
@article{OstermeyerKappeMenzeletal.2005,
  author    = {Ostermeyer, Martin and Kappe, Philip and Menzel, Ralf and Wulfmeyer, Volker},
  title     = {Diode-pumped Nd : YAG master oscillator power amplifier with high pulse energy, excellent beam quality, and frequency-stabilized master oscillator as a basis for a next-generation lidar system},
  issn      = {0003-6935},
  year      = {2005},
  abstract  = {In the original publication [Ostermeyer et al., Appl. Opt., 44, 582-590 (2005)], Fig. 5 appeared twice as Figs. 4 and 5. This inaccuracy is corrected here. (c) 2005 Optical Society of America},
  language  = {en}
}
@book{OstermeyerKappeMenzeletal.2005,
  author    = {Ostermeyer, Martin and Kappe, Philip and Menzel, Ralf and Wulfmeyer, Volker},
  title     = {Diode-pumped Nd : YAG master oscillator power amplifier with high pulse energy, excellent beam quality, and frequency-stabilized master oscillator as a basis for a next-generation lidar system},
  year      = {2005},
  abstract  = {A pulsed, diode-laser-pumped Nd:YAG master oscillator power amplifier (MOPA) in rod geometry, frequency stabilized with a modified Pound-Drever-Hall scheme is presented. The apparatus delivers 33-ns pulses with a maximum pulse energy of 0.5 J at 1064 nm. The system was set up in two different configurations for repetition rates of 100 or 250 Hz. The beam quality was measured to be 1.5 times the diffraction limit at a pulse energy of 405 mJ and a repetition rate of 100 Hz. At 250 Hz with the same pulse energy, the M-2 was better than 2.1. The radiation is frequency converted with an efficiency of 50\% to 532 nm. This MOPA system will be the pump laser of transmitters for a variety of high-end, scanning lidar systems. (C) 2005 Optical Society of America},
  language  = {en}
}
@book{OstermeyerKappeMenzeletal.2005,
  author    = {Ostermeyer, Martin and Kappe, Philip and Menzel, Ralf and Sommer, S. and Dausinger, Friedrich},
  title     = {Laser drilling in thin materials with bursts of ns-pulses generated by stimulated Brillouin scattering (SBS)},
  year      = {2005},
  abstract  = {A passively Q-switched laser with a nonlinear mirror on the basis of stimulated Brillouin scattering (SBS), generates bursts of pulses with a few 10 ns pulse duration and a separation between 20-90 mu s. Percussion drilling and trepanning are performed in different materials with 1 mm thickness. The optimum parameter set of these pulse trains with regard to the burr height and ablation rate is investigated. Differences in the processing results between single pulse and multi pulse structures are discussed. In addition the laser allowed for transiently mode locked operation. Results for mode locked and merely Q-switched operation were compared},
  language  = {en}
}
@article{OstermeyerHodgsonMenzel1998,
  author    = {Ostermeyer, Martin and Hodgson, N. and Menzel, Ralf},
  title     = {High-power, fundamental mode Nd:YALO laser using a phase-conjugate resonator based on SBS},
  year      = {1998},
  language  = {en}
}
@article{OstermeyerHeuerWatermannetal.1996,
  author    = {Ostermeyer, Martin and Heuer, Axel and Watermann, V. and Menzel, Ralf},
  title     = {Single rod Nd:laser with phase conjugating SBS-mirror and large transversal mode for average output powers above 20 Watts},
  year      = {1996},
  language  = {en}
}
@article{OstermeyerHeuerWatermannetal.1996,
  author    = {Ostermeyer, Martin and Heuer, Axel and Watermann, V. and Menzel, Ralf},
  title     = {Resonators with phase conjugating SBS-mirror for solid state lasers with high output powers},
  year      = {1996},
  language  = {en}
}
@article{OstermeyerHeuerMenzel1996,
  author    = {Ostermeyer, Martin and Heuer, Axel and Menzel, Ralf},
  title     = {Q-switching of Nd-lasers with high repetition rates by SBS phase conjugation},
  year      = {1996},
  language  = {en}
}
@article{OstermeyerHeuerMenzel1998,
  author    = {Ostermeyer, Martin and Heuer, Axel and Menzel, Ralf},
  title     = {27 Watt average output power with 1.2*DL beam quality from a single rod Nd:YAG-Laser with phase conjugating SBS- mirror},
  year      = {1998},
  language  = {en}
}
@article{NiebuhrZinkJechowetal.2015,
  author    = {Niebuhr, Mario and Zink, Christof and Jechow, Andreas and Heuer, Axel and Glebov, Leonid B. and Menzel, Ralf},
  title     = {Mode stabilization of a laterally structured broad area diode laser using an external volume Bragg grating},
  series = {Optics express : the international electronic journal of optics},
  volume    = {23},
  journal   = {Optics express : the international electronic journal of optics},
  number    = {9},
  publisher = {Optical Society of America},
  address   = {Washington},
  issn      = {1094-4087},
  doi       = {10.1364/OE.23.012394},
  pages     = {12394 -- 12400},
  year      = {2015},
  abstract  = {An external volume Bragg grating (VBG) is used for transverse and longitudinal mode stabilization of a broad area diode laser (BAL) with an on-chip transverse Bragg resonance (TBR) grating. The internal TBR grating defines a transverse low-loss mode at a specific propagation angle inside the BAL. Selection of the TBR mode was realized via the angular geometry of an external resonator assembly consisting of the TBR BAL and a feedback element. A feedback mirror provides near diffraction limited and spectral narrow output in the TBR mode albeit requiring an intricate alignment procedure. If feedback is provided via a VBG, adjustment proves to be far less critical and higher output powers were achieved. Moreover, additional modulation in the far field distribution became discernible allowing for a better study of the TBR concept. (C) 2015 Optical Society of America},
  language  = {en}
}
@article{MittlerOstermeyerHeueretal.1997,
  author    = {Mittler, Kay and Ostermeyer, Martin and Heuer, Axel and Menzel, Ralf},
  title     = {Longitudinal mode structure of Nd-lasers with phase conjugating mirrors based on stimulated Brillouin scattering in different materials},
  year      = {1997},
  language  = {en}
}
@article{MittlerLorenzMenzel1999,
  author    = {Mittler, Kay and Lorenz, Dieter and Menzel, Ralf},
  title     = {Time resolved emission spectra of a broadband ns-laser with 0.5 W average output power used as light source for the coherence radar},
  year      = {1999},
  language  = {en}
}
@article{MittlerLorenzMenzel1999,
  author    = {Mittler, Kay and Lorenz, Dieter and Menzel, Ralf},
  title     = {Time-resolved measurements of the spectra of a broadband laser used as light source for the coherence radar},
  year      = {1999},
  language  = {en}
}
@article{MittlerLorenzMenzel1999,
  author    = {Mittler, Kay and Lorenz, Dieter and Menzel, Ralf},
  title     = {Broadband operation of a gain-switched Ti:sapphire laser for measurements with the coherence radar},
  issn      = {0277-786X},
  year      = {1999},
  language  = {en}
}
@article{MenzelRaabLorenzetal.2000,
  author    = {Menzel, Ralf and Raab, Volker and Lorenz, Dieter and Heuer, Axel},
  title     = {Efficient phase conjugating mirror with a low threshold in a tapered optical fiber},
  year      = {2000},
  language  = {en}
}
@article{MenzelPuhlmannHeueretal.2012,
  author    = {Menzel, Ralf and Puhlmann, Dirk and Heuer, Axel and Schleich, Wolfgang P.},
  title     = {Wave-particle dualism and complementarity unraveled by a different mode},
  series = {Proceedings of the National Academy of Sciences of the United States of America},
  volume    = {109},
  journal   = {Proceedings of the National Academy of Sciences of the United States of America},
  number    = {24},
  publisher = {National Acad. of Sciences},
  address   = {Washington},
  issn      = {0027-8424},
  doi       = {10.1073/pnas.1201271109},
  pages     = {9314 -- 9319},
  year      = {2012},
  abstract  = {The precise knowledge of one of two complementary experimental outcomes prevents us from obtaining complete information about the other one. This formulation of Niels Bohr's principle of complementarity when applied to the paradigm of wave-particle dualism-that is, to Young's double-slit experiment-implies that the information about the slit through which a quantum particle has passed erases interference. In the present paper we report a double-slit experiment using two photons created by spontaneous parametric down-conversion where we observe interference in the signal photon despite the fact that we have located it in one of the slits due to its entanglement with the idler photon. This surprising aspect of complementarity comes to light by our special choice of the TEM01 pump mode. According to quantum field theory the signal photon is then in a coherent superposition of two distinct wave vectors giving rise to interference fringes analogous to two mechanical slits.},
  language  = {en}
}
@article{MenzelPuhlmannHeuer2017,
  author    = {Menzel, Ralf and Puhlmann, Dirk and Heuer, Axel},
  title     = {Complementarity in single photon interference - the role of the mode function and vacuum fields},
  series = {Journal of the European Optical Society-Rapid},
  volume    = {13},
  journal   = {Journal of the European Optical Society-Rapid},
  publisher = {Springer},
  issn      = {1990-2573},
  doi       = {10.1186/s41476-017-0036-x},
  pages     = {7},
  year      = {2017},
  abstract  = {Background In earlier experiments the role of the vacuum fields could be demonstrated as the source of complementarity with respect to the temporal properties (Heuer et al., Phys. Rev. Lett. 114:053601, 2015). Methods Single photon first order interferences of spatially separated regions from the cone structure of spontaneous parametric down conversion allow for analyzing the role of the mode function in quantum optics regarding the complementarity principle. Results Here the spatial coherence properties of these vacuum fields are demonstrated as the physical reason for complementarity in these single photon quantum optical experiments. These results are directly connected to the mode picture in classical optics. Conclusion The properties of the involved vacuum fields selected via the measurement process are the physical background of the complementarity principle in quantum optics.},
  language  = {en}
}