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  - Ostermeyer, Martin
A1  - Korn, Dietmar
A1  - Puhlmann, Dirk
A1  - Henkel, Carsten
A1  - Eisert, Jens
T1  - Two-dimensional characterization of spatially entangled photon pairs
N2  - We characterize the entanglement in position and momentum of photon pairs generated in type-II parametric down- conversion. Coincidence maps of the photon positions in the near-field and far-field planes are observed in two transverse dimensions using scanning fiber probes. We estimate the covariance matrix of an effective two-mode system and apply criteria for entanglement based on covariance matrices to certify space-momentum entanglement. The role of higher- order spatial modes for observing spatial entanglement between the two photons is discussed.
Y1  - 2009
UR  - http://www.informaworld.com/openurl?genre=journal&issn=0950-0340
U6  - https://doi.org/10.1080/09500340903359962
SN  - 0950-0340
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  - Ostermeyer, Martin
A1  - Mudge, Damien
A1  - Veitch, Peter John
A1  - Munch, Jesper
T1  - Thermally induced birefringence in Nd : YAG slab lasers
N2  - We study thermally induced birefringence in crystalline Nd:YAG zigzag slab lasers and the associated depolarization losses. The optimum crystallographic orientation of the zigzag slab within the Nd:YAG boule and photoelastic effects in crystalline Nd:YAG slabs are briefly discussed. The depolarization is evaluated using the temperature and stress distributions, calculated using a finite element model, for realistically pumped and cooled slabs of finite dimensions. Jones matrices are then used to calculate the depolarization of the zigzag laser mode. We compare the predictions with measurements of depolarization, and suggest useful criteria for the design of the gain media for such lasers.
Y1  - 2006
UR  - http://www.opticsinfobase.org/
U6  - https://doi.org/10.1364/AO.45.005368
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  - BOOK
A1  - Ostermeyer, Martin
A1  - Brandenburg, Ingo
T1  - Simulation of the extraction of near diffraction limited Gaussian beams from side pumped core doped ceramic Nd:YAG and conventional laser rods
N2  - The application of the recently developed core doped ceramic Nd:YAG rods has the potential to provide better beam qualities compared to conventional rods since the hard aperture of the rod's boundary can be made wider while the width of the gain region remains the same. Thus, beam truncation and consequential diffraction can be reduced. We apply a finite elements model to calculate the resulting refractive index profiles in conventional and core doped rods. Propagating a Gaussian beam through both rod geometries the impact of aberrations and diffraction is compared for different side pumped scenarios. The potential advantage of the core doped geometry is discussed. (c) 2005 Optical Society of America
Y1  - 2005
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  - 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  -