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Proceedings Paper

Laser diode phase-conjugate interferometry with a frequency-modulated continuous-wave technique
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Paper Abstract

Laser-diode phase-conjugate interferometry with self-pumped phase-conjugate mirrors (SPPCMs) is presented by using a frequency-modulated continuous-wave (FMCW) technique. The phase is shifted to produce a spatially uniform phase change uncancelled by a phase conjugator between two beams of an unbalanced interferometer. The phase-modulated conjugate wave with the frequency-ramped laser diode (LD) is stable since the frequency-modulated LD can decrease the grating contrast due to the average action of moving gratings inside a crystal. A wavefront-matched interferometer has been constructed with two BaTiO3, SPPCMs instead of usual two mirrors. The wavefront-matched unbalanced interferometer does not depend on the distortion of input wave, but can only detect the spatially uniform phase change introduced by the displacement of one cat mirror in two phase-conjugate mirrors. The FMCW technique can be applied to a tunable-LD wavefront-matched interferometer for distance measurement that is not significantly dependent on the phase distortion. The distance introduced by the displacement of one cat mirror in the interferometer can be measured by detecting the carrier beat frequencies with an rf spectrum analyzer.

Paper Details

Date Published: 19 October 2000
PDF: 9 pages
Proc. SPIE 4110, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI, (19 October 2000); doi: 10.1117/12.404765
Show Author Affiliations
Yukihiro Ishii, Univ. of Industrial Technology (Japan)
Takeshi Takahashi, Univ. of Industrial Technology (Japan)


Published in SPIE Proceedings Vol. 4110:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VI
Shizhuo Yin; Francis T. S. Yu, Editor(s)

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