@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{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{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{HeuerSchultheissHodgsonetal.1999,
  author    = {Heuer, Axel and Schultheiss, J. and Hodgson, N. and Kurths, J{\"u}rgen and Menzel, Ralf and Raab, Volker},
  title     = {Transverse effects in phase conjugate laser mirrors based on stimulated brillouin scattering},
  year      = {1999},
  language  = {en}
}
@article{ElsnerPuhlmannPieplowetal.2015,
  author    = {Elsner, Robert and Puhlmann, Dirk and Pieplow, Gregor and Heuer, Axel and Menzel, Ralf},
  title     = {Transverse distinguishability of entangled photons with arbitrarily shaped spatial near- and far-field distributions},
  series = {Journal of the Optical Society of America : B, Optical physics},
  volume    = {32},
  journal   = {Journal of the Optical Society of America : B, Optical physics},
  number    = {9},
  publisher = {Optical Society of America},
  address   = {Washington},
  issn      = {0740-3224},
  doi       = {10.1364/JOSAB.32.001910},
  pages     = {1910 -- 1919},
  year      = {2015},
  abstract  = {Entangled photons generated by spontaneous parametric downconversion are ubiquitous in quantum optics. In general, they exhibit a complex spatial photon count distribution. This spatial structure is responsible for seemingly surprising results concerning, e.g., complementarity such as the apparent simultaneous observation of interference fringes V and which-way information D at a double slit, as recently reported by Menzel et al. [Proc. Natl. Acad. Sci. USA 109, 9314 (2012)]. We implement a complete quantitative model of the SPDC interaction that fully incorporates the effects of crystal anisotropies, phase matching, and the pump beam structure and allows for arbitrary manipulations of the SPDC light in the near and far fields. This enables us to establish an upper bound D-2 + V-2 <= 1.47 for the experimental parameters reported by Menzel et al. We report new experimental results that agree excellently with these theoretical predictions. The new model enables a detailed quantitative analysis of this surprising result and the fair sampling interpretation of biphotons passing a double slit. (C) 2015 Optical Society of America},
  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{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     = {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{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{MenzelMarxPuhlmannetal.2019,
  author    = {Menzel, Ralf and Marx, Robert and Puhlmann, Dirk and Heuer, Axel and Schleich, Wolfgang},
  title     = {The photon},
  series = {Journal of the Optical Society of America : B, Optical physics},
  volume    = {36},
  journal   = {Journal of the Optical Society of America : B, Optical physics},
  number    = {6},
  publisher = {Optical Society of America},
  address   = {Washington},
  issn      = {0740-3224},
  doi       = {10.1364/JOSAB.36.001668},
  pages     = {1668 -- 1675},
  year      = {2019},
  abstract  = {We investigate the role of the spatial mode function in a single-photon experiment designed to demonstrate the principle of complementarity. Our approach employs entangled photons created by spontaneous parametric downconversion from a pump mode in a TEM01 mode together with a double slit. Measuring the interference of the signal photons behind the double slit in coincidence with the entangled idler photons at different positions, we select signal photons of different mode functions. When the signal photons belong to the TEM01-like double-hump mode, we obtain almost perfect visibility of the interference fringes, and no "which slit" information is available in the idler photon detected before the slits. This result is remarkable because the entangled signal and idler photon pairs are created each time in only one of the two intensity humps. However, when we break the symmetry between the two maxima of the signal photon mode structure, the paths through the slits for these additional photons become distinguishable and the visibility vanishes. It is the mode function of the photons selected by the detection system that decides if interference or "which slit" information is accessible in the experiment.},
  language  = {en}
}