, Volume 9, Issue 1, pp 13-17

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

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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.