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Proceedings Paper

Laser vibrometer using GaAs adaptive photodetectors based on the effect of the non-steady-state photoelectromotive force
Author(s): Igor A. Sokolov; Vladimir V. Kulikov; Costas Kalpouzos; Nikos A. Vainos
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Paper Abstract

We report on simple high-sensitivity interferometric technique of detecting vibrations and present characteristics of laser vibrometer using GaAs adaptive photodetectors based on the effect of the non-steady-state photoelectromotive force. It enables efficient direct conversion of high-frequency phase modulation of speckle- like optical wave reflected from the vibrating object into an output electrical signal with concomitant setting of optical operation point of the interferometer and suppression of amplitude laser noise. The results of measurements of small vibration amplitudes of the mirror and diffusely scattering objects are presented. Preliminary studies at 1.06 micrometers showed that it is possible to detect ultrasonic vibrations with the amplitude of 0.2 angstrom with a signal power of 20 mW and a bandwidth of 15.5 MHz. The sensitivity of GaAs adaptive photodetectors at 0.63 micrometers was found to be 0.1 angstrom for excitation frequency 1 kHz, registration bandwidth 1 Hz and average laser power on the photodetector 200 (mu) W. This optical phase-to- electrical signal converter is not sensible to ambient vibrations, thermal drift, amplitude laser noise and is therefore appropriated for industrial applications.

Paper Details

Date Published: 1 June 1998
PDF: 8 pages
Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); doi: 10.1117/12.307684
Show Author Affiliations
Igor A. Sokolov, A.F. Ioffe Physical-Technical Institute (Russia)
Vladimir V. Kulikov, A.F. Ioffe Physical-Technical Institute (Russia)
Costas Kalpouzos, FORTH-IESL (Greece)
Nikos A. Vainos, FORTH-IESL (Greece)


Published in SPIE Proceedings Vol. 3411:
Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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