Off-resonance properties of a photoelastic modulator

Karlton Crabtree, Neil Beaudry, Russell A Chipman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 1/3 rd 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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJ.A. Shaw, J.S. Tyo
Pages1-6
Number of pages6
Volume5888
DOIs
StatePublished - 2005
EventPolarization Science and Remote Sensing II - San Diego, CA, United States
Duration: Aug 2 2005Aug 4 2005

Other

OtherPolarization Science and Remote Sensing II
CountryUnited States
CitySan Diego, CA
Period8/2/058/4/05

Fingerprint

Modulators
modulators
polarization modulation
shutdowns
Polarimeters
polarimeters
transfer functions
Transfer functions
resonant frequencies
Natural frequencies
high speed
Modulation
Polarization
low frequencies
Infrared radiation
harmonics
oscillations
configurations

Keywords

  • Photo-elastic modulator
  • Polarimetry
  • Polarization modulation
  • Retardance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Crabtree, K., Beaudry, N., & Chipman, R. A. (2005). Off-resonance properties of a photoelastic modulator. In J. A. Shaw, & J. S. Tyo (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 5888, pp. 1-6). [58880A] https://doi.org/10.1117/12.621527

Off-resonance properties of a photoelastic modulator. / Crabtree, Karlton; Beaudry, Neil; Chipman, Russell A.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / J.A. Shaw; J.S. Tyo. Vol. 5888 2005. p. 1-6 58880A.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Crabtree, K, Beaudry, N & Chipman, RA 2005, Off-resonance properties of a photoelastic modulator. in JA Shaw & JS Tyo (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 5888, 58880A, pp. 1-6, Polarization Science and Remote Sensing II, San Diego, CA, United States, 8/2/05. https://doi.org/10.1117/12.621527
Crabtree K, Beaudry N, Chipman RA. Off-resonance properties of a photoelastic modulator. In Shaw JA, Tyo JS, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5888. 2005. p. 1-6. 58880A https://doi.org/10.1117/12.621527
Crabtree, Karlton ; Beaudry, Neil ; Chipman, Russell A. / Off-resonance properties of a photoelastic modulator. Proceedings of SPIE - The International Society for Optical Engineering. editor / J.A. Shaw ; J.S. Tyo. Vol. 5888 2005. pp. 1-6
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