@article{HeuerMenzel2000,
  author    = {Heuer, Axel and Menzel, Ralf},
  title     = {Temporal features of SBS phase conjugation},
  isbn      = {0-8194-3545-7},
  year      = {2000},
  language  = {en}
}
@article{HeuerMenzel2000,
  author    = {Heuer, Axel and Menzel, Ralf},
  title     = {Low threshold SBS phase conjugation for quasi-cw laser systems},
  year      = {2000},
  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{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{KlemzKubinaOstermeyeretal.2001,
  author    = {Klemz, Guido and Kubina, P. and Ostermeyer, Martin and Menzel, Ralf},
  title     = {Diode pumped high power TEM_00 Nd:YAG rod laser with birefringence compensation},
  year      = {2001},
  language  = {en}
}
@article{HaenischHeuerMenzel2001,
  author    = {H{\"a}nisch, Christoph and Heuer, Axel and Menzel, Ralf},
  title     = {Threshold reduction of stimulated Brillouin scattering (SBS) using fiber loop schemes},
  year      = {2001},
  language  = {en}
}
@article{AfshaarvahidHeuerMenzeletal.2001,
  author    = {Afshaarvahid, Shahraam and Heuer, Axel and Menzel, Ralf and Munch, Jesper},
  title     = {Temporal structure of stimulated-Brillouin-scattering reflectivity considering transversal-mode development},
  year      = {2001},
  language  = {en}
}
@article{Menzel2001,
  author    = {Menzel, Ralf},
  title     = {Photonics : Linear and nonlinear interactions of laser light and matter},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {3-540-67074-2},
  pages     = {873 S.},
  year      = {2001},
  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{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{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{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}
}
@book{HeuerHaenischOstermeyeretal.2002,
  author    = {Heuer, Axel and H{\"a}nisch, Christoph and Ostermeyer, Martin and Menzel, Ralf},
  title     = {Low Power Threshold Phase Conjugating Mirrors by SBS in Yb-doped Fiber Amplifiers},
  year      = {2002},
  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{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{HeuerHaenischMenzel2003,
  author    = {Heuer, Axel and H{\"a}nisch, Christoph and Menzel, Ralf},
  title     = {New concept for low threshold optical phase conjugation via SBS in a fiber amplifier},
  isbn      = {0-8194-4772-2},
  year      = {2003},
  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{HeuerHaenischMenzel2003,
  author    = {Heuer, Axel and H{\"a}nisch, Christoph and Menzel, Ralf},
  title     = {Low-power phase conjugation based on stimulated Brillouin scattering in fiber amplifiers},
  year      = {2003},
  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{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{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{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{Menzel2004,
  author    = {Menzel, Ralf},
  title     = {Metrological Applications},
  isbn      = {3-540-20114-9},
  year      = {2004},
  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{HeuerMenzel2004,
  author    = {Heuer, Axel and Menzel, Ralf},
  title     = {Principles of Phase Conjugating Brillouin Mirrors},
  isbn      = {0-471-43957-6},
  year      = {2004},
  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}
}
@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}
}
@article{KappeOstermeyerMenzel2005,
  author    = {Kappe, Philip and Ostermeyer, Martin and Menzel, Ralf},
  title     = {Active mode locking of a phase-conjugating SBS-laser oscillator},
  issn      = {0946-2171},
  year      = {2005},
  abstract  = {We present a flashlamp-pumped Nd: YAG laser simultaneously emitting pulse structures on microsecond, nanosecond and picosecond time scales. Within a microsecond flashlamp pump pulse a nonlinear reflector based on stimulated Brillouin scattering (SBS) generates several Q-switch pulses. The phase-conjugating effect of the SBS reflector provides a compensation of phase distortions generated inside the laser rod, resulting in transverse fundamental mode operation. Additional acousto-optic loss modulation inside the resonator leads to mode locking. As a result, each Q-switch pulse is subdivided into several picosecond pulses. Energies of up to 2 mJ for the mode-locked pulses with durations between 220 and 800 ps are demonstrated. The wide variability of the laser's temporal output parameters as well as its high beam quality make it a splendid tool for fundamental research in laser materials processing},
  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}
}
@article{LiMoehwaldSpitzetal.2005,
  author    = {Li, L. and M{\"o}hwald, Helmuth and Spitz, Christian and von Seggern, David and Mucke, M. and Menzel, Ralf},
  title     = {Long-lived photoinduced charge separation inside polarity gradient capsules},
  year      = {2005},
  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{KappeOstermeyerMenzel2005,
  author    = {Kappe, Philip and Ostermeyer, Martin and Menzel, Ralf},
  title     = {Active mode locking of a phase-conjugating SBS-laser oscillator},
  issn      = {0946-2171},
  year      = {2005},
  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{JechowRaabMenzel2006,
  author    = {Jechow, Andreas and Raab, Volker and Menzel, Ralf},
  title     = {High cw power using an external cavity for spectral beam combining of diode laser-bar emission},
  issn      = {0003-6935},
  doi       = {10.1364/AO.45.003545},
  year      = {2006},
  abstract  = {In extension to known concepts of wavelength-multiplexing diode laser arrays, a new external cavity is presented. The setup simultaneously improves the beam quality of each single emitter of a standard 25 emitter broad-area stripe laser bar and spectrally superimposes the 25 beams into one. By using this external resonator in an "off-axis" arrangement, beam qualities of M-slow(2) < 14 and M-fast(2) < 3 with optical powers in excess of 10 W in cw operation are obtained.},
  language  = {en}
}
@article{Menzel2007,
  author    = {Menzel, Ralf},
  title     = {Photonics : linear and nonlinear interactions of laser light and matter},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-540-67074-2},
  pages     = {1024 S.},
  year      = {2007},
  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}
}
@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}
}