Optical Review

, Volume 9, Issue 1, pp 13–17

Photothermal Phase-Modulating Laser Diode Interferometer with High-Speed Feedback Control


  • Xuefeng Zhao
    • Faculty of EngineeringNiigata University
  • Takamasa Suzuki
    • Faculty of EngineeringNiigata University
  • Osami Sasaki
    • Faculty of EngineeringNiigata University

DOI: 10.1007/s10043-002-0013-4

Cite this article as:
Zhao, X., Suzuki, T. & Sasaki, O. OPT REV (2002) 9: 13. doi:10.1007/s10043-002-0013-4


We propose a photothermal phase-modulating laser diode interferometer equipped with a high-speed feedback control system. The CCD camera’s shutter-function raises the modulating frequency, which in turn elicits a higher feedback response, thus enabling us to eliminate nearly all external disturbance. With the recent application of a system purpose-built for discriminating between numerous fringe sequences, we have also reduced processing time.

Key words

photothermal modulationlaser diodeinterferometerelectronic-shutterintegrating-bucket methodsinusoidal phase modulatingfeedback control

Copyright information

© The Optical Society of Japan 2002