R
Richard Kowarschik
Researcher at University of Jena
Publications - 213
Citations - 1962
Richard Kowarschik is an academic researcher from University of Jena. The author has contributed to research in topics: Photorefractive effect & Interferometry. The author has an hindex of 23, co-authored 211 publications receiving 1850 citations. Previous affiliations of Richard Kowarschik include Schiller International University & Bosch.
Papers
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Investigation of photo-induced absorption in a Bi12TiO20 crystal
A. Matusevich,A. Matusevich,Alexei L. Tolstik,M. G. Kisteneva,Stanislav M. Shandarov,V. Matusevich,Armin Kiessling,Richard Kowarschik +7 more
TL;DR: In this paper, a photorefractive Bi12TiO20 (BTO) crystal is exposed with high intensity pulsed-laser beams 532 nm and the photo-induced dynamics of the absorption between 480 and 900 nm are studied and explained by two long-lived energy levels in the forbidden band.
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Broadening of the light self-trapping due to thermal defocusing in PQ-PMMA polymeric layers
TL;DR: The channel formation by the self-trapping of a (1 + 1)D beam in polymeric media based on a polymethylmethacrylate (PMMA) matrix containing phenanthrenequinone molecules is predicted theoretically and observed experimentally for the first time.
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Optimum orientation of volume phase gratings in sillenite crystals: is it always [111]?
Ekaterina Shamonina,V. P. Kamenov,Klaus H. Ringhofer,G. Cedilnik,Armin Kiessling,Richard Kowarschik +5 more
TL;DR: In this article, the authors study the simultaneous influence of optical activity, piezoelectric effect, and elasto-optic effect on two-wave mixing under diffusion recording in photorefractive Bi12TiO20 and Bi12SiO20 crystals and find numerically the maximum of the TWM gain as a function of the orientation of the grating vector.
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Camera influence on the phase-measurement accuracy of a phase-shifting speckle interferometer.
Thomas Maack,Richard Kowarschik +1 more
TL;DR: To obtain the minimum phase-measurement error, it is found that the mean speckle intensity ought to be adjusted to be 0.058 times the saturation intensity of the camera and the beam ratio is to be 5.7.
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Giant momentary readout produced by switching electric fields during two-wave mixing in sillenites.
Ekaterina Shamonina,Klaus H. Ringhofer,B. I. Sturman,V. P. Kamenov,G. Cedilnik,M. Esselbach,Armin Kiessling,Richard Kowarschik,Alexei A. Kamshilin,Victor V. Prokofiev,Timo Jaaskelainen +10 more
TL;DR: It is shown theoretically and experimentally that switching an applied square-wave field produces strong and short pulses of the outgoing signal during two-wave mixing in sillenite crystals that can be used in new optical schemes based on time-separated recording and readout processes.