Talks and Poster Presentations (with Proceedings-Entry):
F. Bammer, B. Holzinger, T. Schumi:
"A single crystal photo-elastic modulator";
Talk: Photonics West 2007,
San Jose, Kalifornien, USA;
01-22-2007
- 01-24-2007; in: "Proceedings of SPIE, Optical Components and Materials IV",
S. Jiang, M. Digonnet (ed.);
SPIE,
6469
(2007),
ISSN: 0277-786x;
64690O-1
- 64690O-8.
English abstract:
We present theoretical and experimental data and possible applications of a photo-elastic-modulator (PEM) made of LiTaO3. The device with dimensions 13.2x7.1x5.5 mm in x-, y- and z-direction and electrodes on the zx-surfaces offers basic modulation frequencies at 199, 348 and 377 kHz corresponding to the longitudinal oscillations in x- and y-direction and to a yz-shear oscillation mode. The light travels along the optical axis. At the main resonance at 199 kHz the voltage amplitude to achieve a quarter wave retardation amplitude is only ~2.5V, a very low value due to the strong piezo-electric response and the low loss of LiTaO3. Hence when compared to a conventional photo-elastic modulator, which is made out of at least two components, the device is extremely compact, cheap and easy to operate, especially when placed in a feedback loop of an amplifier such that it operates on one fixed frequency
Keywords:
photo-elastic modulators, LiNbO3, LiTaO3, ellipsometry
Electronic version of the publication:
http://publik.tuwien.ac.at/files/pub-mb_5759.pdf
Created from the Publication Database of the Vienna University of Technology.