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Proceedings Paper

Off-resonance properties of a photoelastic modulator
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Paper Abstract

Polarization modulation in photo-elastic modulators (PEM) driven on and off resonance has been investigated for a commercially available PEM using a high speed infrared (lambda=1550 nm) polarimeter. Off-resonance operation was explored in the hope of finding a slower operating mode than the primary resonance. The primary resonance, used for normal PEM operation, was 5 Hz wide with a Q of 8500. The phase transfer function was well behaved and typical of electrical resonances. Device startup and shutdown had smooth amplitude changes occurring over 1/3rd of a second. The photo-elastic modulator was examined at drive frequencies significantly below the resonant frequency. Driving the PEM with several odd sub-harmonics generated resonance at the fundamental frequency. Three other lower frequency resonances were discovered, but all at an oscillation amplitude more than 12 db below the amplitude of the fundamental resonance. Thus a practical configuration to allow slower operation of the PEM was not found.

Paper Details

Date Published: 18 August 2005
PDF: 6 pages
Proc. SPIE 5888, Polarization Science and Remote Sensing II, 58880A (18 August 2005); doi: 10.1117/12.621527
Show Author Affiliations
Karlton Crabtree, College of Optical Sciences/The Univ. of Arizona (United States)
Neil Beaudry, College of Optical Sciences/The Univ. of Arizona (United States)
Russell Chipman, College of Optical Sciences/The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 5888:
Polarization Science and Remote Sensing II
Joseph A. Shaw; J. Scott Tyo, Editor(s)

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