26 November 2007 Phase-shifting laser diode Sagnac interferometer for surface profile measurement
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A phase-shifting Sagnac interferometer that uses wavelength tunability of the laser diode is proposed. A Sagnac interferometer itself is robust for the mechanical disturbances because it has a common path configuration and requires no special reference. Unbalanced optical path introduced between p- and s-polarized beams enables us to implement easy phase-shift by the direct current modulation. Several experimental results indicate that the proposed system is useful for the disturbance-free precise measurement.
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Takamasa Suzuki, Takamasa Suzuki, Masato Shirai, Masato Shirai, Osami Sasaki, Osami Sasaki, } "Phase-shifting laser diode Sagnac interferometer for surface profile measurement", Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 68290A (26 November 2007); doi: 10.1117/12.756447; https://doi.org/10.1117/12.756447

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