TY - JOUR A1 - Sander, Rolf A1 - Herrmann, V. A1 - Menzel, Ralf T1 - Transient absorption spectra and bleaching of 4'-n-Pentyl-4-Cyanoterphenyl in Cyclohexane : determination of cross sections and recovery times Y1 - 1996 ER - TY - JOUR A1 - Elsner, Robert A1 - Puhlmann, Dirk A1 - Pieplow, Gregor A1 - Heuer, Axel A1 - Menzel, Ralf T1 - Transverse distinguishability of entangled photons with arbitrarily shaped spatial near- and far-field distributions JF - Journal of the Optical Society of America : B, Optical physics N2 - 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 Y1 - 2015 U6 - https://doi.org/10.1364/JOSAB.32.001910 SN - 0740-3224 SN - 1520-8540 VL - 32 IS - 9 SP - 1910 EP - 1919 PB - Optical Society of America CY - Washington ER - TY - JOUR A1 - Heuer, Axel A1 - Schultheiss, J. A1 - Hodgson, N. A1 - Kurths, Jürgen A1 - Menzel, Ralf A1 - Raab, Volker T1 - Transverse effects in phase conjugate laser mirrors based on stimulated brillouin scattering Y1 - 1999 ER - TY - JOUR A1 - Ostermeyer, Martin A1 - Lorenz, Dieter A1 - Hodgson, N. A1 - Menzel, Ralf T1 - Transverse Modes in Laser Resonators with Phase Conjugating Mirror Based on Stimulated Brillouin Scattering (SBS) Y1 - 1997 ER - TY - JOUR A1 - Raab, Volker A1 - Skoczowsky, Danilo A1 - Menzel, Ralf T1 - 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 Y1 - 2003 ER - TY - JOUR A1 - Elsner, Robert A1 - Ullmann, Roland A1 - Heuer, Axel A1 - Menzel, Ralf A1 - Ostermeyer, Martin T1 - Two-dimensional modeling of transient gain gratings in saturable gain media JF - OPTICS EXPRESS N2 - A transient two-dimensional model describing degenerate four-wave mixing inside saturable gain media is presented. The new model is compared to existing one-dimensional models with their qualitative results confirmed. Large quantitative differences with respect to peak reflectivity and optimum pump fluence are observed. Furthermore, the influence of the beam focus size, the transverse position and the crossing angle on the reflectivity of the grating is investigated using the improved model. It is demonstrated that the phase conjugate reflectivity depends sensitively on the transverse features of the interacting beams with a transverse shift in the position of the pump beams yielding a threefold improvement in reflectivity. (C) 2012 Optical Society of America Y1 - 2012 U6 - https://doi.org/10.1364/OE.20.006887 SN - 1094-4087 VL - 20 IS - 7 SP - 6887 EP - 6896 PB - OPTICAL SOC AMER CY - WASHINGTON ER - TY - JOUR A1 - Schwarze, Thomas A1 - Garz, Andreas A1 - Teuchner, Klaus A1 - Menzel, Ralf A1 - Holdt, Hans-Jürgen T1 - Two-photon probes for metal ions based on phenylaza[18]crown-6 ethers and 1,2,3-triazoles as pi-linkers JF - ChemPhysChem : a European journal of chemical physics and physical chemistry KW - absorption KW - cations KW - click chemistry KW - dyes/pigments KW - fluorescence Y1 - 2014 U6 - https://doi.org/10.1002/cphc.201402232 SN - 1439-4235 SN - 1439-7641 VL - 15 IS - 12 SP - 2436 EP - 2439 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Menzel, Ralf A1 - Puhlmann, Dirk A1 - Heuer, Axel A1 - Schleich, Wolfgang P. T1 - Wave-particle dualism and complementarity unraveled by a different mode JF - Proceedings of the National Academy of Sciences of the United States of America N2 - 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. Y1 - 2012 U6 - https://doi.org/10.1073/pnas.1201271109 SN - 0027-8424 VL - 109 IS - 24 SP - 9314 EP - 9319 PB - National Acad. of Sciences CY - Washington ER -