TY  - JOUR
A1  - Hänisch, Christoph
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Threshold reduction of stimulated Brillouin scattering (SBS) using fiber loop schemes
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
A1  - Marx, Robert
A1  - Puhlmann, Dirk
A1  - Heuer, Axel
A1  - Schleich, Wolfgang
T1  - The photon
BT  - the role of its mode function in analyzing complementarity
JF  - Journal of the Optical Society of America : B, Optical physics
N2  - 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.
Y1  - 2019
U6  - https://doi.org/10.1364/JOSAB.36.001668
SN  - 0740-3224
SN  - 1520-8540
VL  - 36
IS  - 6
SP  - 1668
EP  - 1675
PB  - Optical Society of America
CY  - Washington
ER  - 
TY  - JOUR
A1  - Rätzel, Dennis
A1  - Wilkens, Martin
A1  - Menzel, Ralf
T1  - The effect of entanglement in gravitational photon-photon scattering
JF  - epl : a letters journal exploring the frontiers of physics
N2  - 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
Y1  - 2016
U6  - https://doi.org/10.1209/0295-5075/115/51002
SN  - 0295-5075
SN  - 1286-4854
VL  - 115
SP  - S12
EP  - S13
PB  - EDP Sciences
CY  - Mulhouse
ER  - 
TY  - JOUR
A1  - Afshaarvahid, Shahraam
A1  - Heuer, Axel
A1  - Menzel, Ralf
A1  - Munch, Jesper
T1  - Temporal structure of stimulated-Brillouin-scattering reflectivity considering transversal-mode development
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Temporal features of SBS phase conjugation
Y1  - 2000
SN  - 0-8194-3545-7
ER  - 
TY  - JOUR
A1  - Jechow, Andreas
A1  - Lichtner, Mark
A1  - Menzel, Ralf
A1  - Radziunas, Mindaugas
A1  - Skoczowsky, Danilo
A1  - Vladimirov, Andrei G.
T1  - Stripe-array diode-laser in an off-axis external cavity : theory and experiment
N2  - Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles ña depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle 2a a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration.
Y1  - 2009
UR  - http://www.opticsinfobase.org/oe/Issue.cfm
U6  - https://doi.org/10.1364/OE.17.019599
SN  - 1094-4087
ER  - 
TY  - JOUR
A1  - Jechow, Andreas
A1  - Lichtner, Mark
A1  - Menzel, Ralf
A1  - Radziunas, Mindaugas
A1  - Skoczowsky, Danilo
A1  - Vladimirov, Andrei G.
T1  - Stripe-array diode-laser in an off-axis external cavity : theory and experiment
N2  - Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles +/-alpha depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle 2 alpha a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration.
Y1  - 2009
UR  - http://www.opticsexpress.org/Issue.cfm
U6  - https://doi.org/10.1364/OE.17.019599
SN  - 1094-4087
ER  - 
TY  - JOUR
A1  - Lorenz, Dieter
A1  - Brandenburg, Ingo
A1  - Menzel, Ralf
T1  - Spectral broadening of the laser spectrum of gain-switched Ti:sapphire laser with nonlinear absorbers
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Hodgson, N.
A1  - Lorenz, Dieter
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - Solid state lasers with high brightness via optical phase conjugation for micromachining
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Watermann, V.
A1  - Menzel, Ralf
T1  - Single rod Nd:laser with phase conjugating SBS-mirror and large transversal mode for average output powers above 20 Watts
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - 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
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
T1  - SBS-Phase Conjugation for Thermal Lens Compensation in 100 Watt Average Power Solid-State Lasers
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Menzel, Ralf
A1  - Sander, Rolf
A1  - Schulzke, M.
A1  - Schwartz, J.
T1  - SBS at different wavelengths between 308 and 725 nm
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Watermann, V.
A1  - Menzel, Ralf
T1  - Resonators with phase conjugating SBS-mirror for solid state lasers with high output powers
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Skoczowsky, Danilo
A1  - Jechow, Andreas
A1  - Stürmer, Herbert
A1  - Poßner, Torsten
A1  - Sacher, Joachim
A1  - Menzel, Ralf
T1  - Quasi-monolithic ring resonator for efficient frequency doubling of an external cavity diode laser
N2  - 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.
Y1  - 2010
UR  - http://www.springerlink.com/content/100502
U6  - https://doi.org/10.1007/s00340-009-3802-7
SN  - 0946-2171
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Klemz, Guido
A1  - Kubina, P.
A1  - Menzel, Ralf
T1  - Quasi-continuous-wave birefringence-compensated single- and double-rod Nd : YAG lasers
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Q-switching of Nd-lasers with high repetition rates by SBS phase conjugation
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Mittler, Kay
A1  - Menzel, Ralf
T1  - Q switch and longitudinal modes of a laser oscillator with a stimulated-Brillouin-scattering mirror
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Principles of Phase Conjugating Brillouin Mirrors
Y1  - 2004
SN  - 0-471-43957-6
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
A1  - Ostermeyer, Martin
T1  - Power tunable Nd-oscillators with diffraction limited beams via SBS phase conjugation
Y1  - 1996
ER  -