Optical Review

, Volume 9, Issue 1, pp 13–17 | Cite as

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

  • Xuefeng Zhao
  • Takamasa Suzuki
  • Osami Sasaki


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 modulation laser diode interferometer electronic-shutter integrating-bucket method sinusoidal phase modulating feedback control 


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Copyright information

© The Optical Society of Japan 2002

Authors and Affiliations

  • Xuefeng Zhao
    • 1
  • Takamasa Suzuki
    • 1
  • Osami Sasaki
    • 1
  1. 1.Faculty of EngineeringNiigata UniversityNiigataJapan

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