TY  - JOUR
A1  - Heuer, Axel
A1  - Hänisch, Christoph
A1  - Menzel, Ralf
T1  - New concept for low threshold optical phase conjugation via SBS in a fiber amplifier
Y1  - 2003
SN  - 0-8194-4772-2
ER  - 
TY  - BOOK
A1  - Heuer, Axel
A1  - Hänisch, Christoph
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - Low Power Threshold Phase Conjugating Mirrors by SBS in Yb-doped Fiber Amplifiers
Y1  - 2002
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
T1  - Phase conjugating SBS-mirror for low powers and reflectivities above 90 % in an internally tapered optical fiber
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Low threshold SBS phase conjugation for quasi-cw laser systems
Y1  - 2000
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  - Heuer, Axel
A1  - Menzel, Ralf
A1  - Milonni, P. W.
T1  - Complementarity in biphoton generation with stimulated or induced coherence
JF  - Physical review : A, Atomic, molecular, and optical physics
N2  - Coherence can be induced or stimulated in parametric down-conversion using two or three crystals when, for example, the idler modes of the crystals are aligned. Previous experiments with induced coherence [Phys. Rev. Lett. 114, 053601 (2015)] focused on which-path information and the role of vacuum fields in realizing complementarity via reduced visibility in single-photon interference. Here we describe experiments comparing induced and stimulated coherence. Different single-photon interference experiments were performed by blocking one of the pump beams in a three-crystal setup. Each counted photon is emitted from one of two crystals and which-way information may or not be available, depending on the setup. Distinctly different results are obtained in the induced and stimulated cases, especially when a variable transmission filter is inserted between the crystals. A simplified theoretical model accounts for all the experimental results and is also used to address the question of whether the phases of the signal and idler fields in parametric down-conversion are correlated.
Y1  - 2015
U6  - https://doi.org/10.1103/PhysRevA.92.033834
SN  - 1050-2947
SN  - 1094-1622
VL  - 92
IS  - 3
PB  - American Physical Society
CY  - College Park
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  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Raabe, S.
A1  - Menzel, Ralf
T1  - Phase memory across two single-photon interferometers including wavelength conversion
JF  - Physical review : A, Atomic, molecular, and optical physics
N2  - Spontaneous parametric down-conversion (SPDC) in a nonlinear crystal generates two single photons (signal and idler) with random phases. Thus, no first-order interference between them occurs. However, coherence can be induced in a cascaded setup of two crystals if, e.g., the idler modes of both crystals are aligned to be indistinguishable. Due to the effect of phase memory it is found that the first-order interference of the signal beams can be controlled by the phase delay between the pump beams. Even for pump photon delays much larger than the coherence length of the SPDC photons, the visibility is above 90%. The high visibilities reported here prove an almost perfect phase memory effect across the two interferometers for the pump and the signal photon modes.
Y1  - 2014
U6  - https://doi.org/10.1103/PhysRevA.90.045803
SN  - 1050-2947
SN  - 1094-1622
VL  - 90
IS  - 4
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Sagahti, A.
A1  - Jechow, Andreas
A1  - Skoczowsky, D.
A1  - Menzel, Ralf
T1  - Multi-wavelength, high spatial brightness operation of a phase-locked stripe-array diode laser
JF  - Laser physics
N2  - Stable continuous wave multi-wavelength operation of a stripe-array diode laser with an externalcavity spectral beam combining geometry is presented. In this setup each emitter of the stripe-array is forced to operate at a different wavelength, which leads to a decoupling between the usually phase-locked emitters. With a reflective diffraction grating with a period of 300 lines per mm, 33 equidistant laser lines around a center wavelength of 978 nm were realized, spanning a spectral range of 26 nm. With this novel approach near-diffraction limited emission with a beam quality of M (2) < 1.2 and an output power of 450 mW was achieved. This laser light source can be used for applications requiring low temporal but high spatial coherence.
Y1  - 2012
U6  - https://doi.org/10.1134/S1054660X12010057
SN  - 1054-660X
VL  - 22
IS  - 1
SP  - 160
EP  - 164
PB  - Pleiades Publ.
CY  - New York
ER  -