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Proceedings Paper

A single crystal photo-elastic-modulator
Author(s): F. Bammer; B. Holzinger; T. Schumi
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Paper 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 ~2.5 V, 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.

Paper Details

Date Published: 20 February 2007
PDF: 8 pages
Proc. SPIE 6469, Optical Components and Materials IV, 64690O (20 February 2007); doi: 10.1117/12.699304
Show Author Affiliations
F. Bammer, Vienna Univ. of Technology (Austria)
B. Holzinger, Vienna Univ. of Technology (Austria)
T. Schumi, Vienna Univ. of Technology (Austria)

Published in SPIE Proceedings Vol. 6469:
Optical Components and Materials IV
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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