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Self-mixing type of phase-locked laser diode interferometer
Self-mixing type of phase-locked laser diode interferometer
Suzuki, Takamasa
39
Hirabayashi, Shigeyuki
7495
Sasaki, Osami
7496
Maruyama, Takeo
7497
optical feedback
self-mixing
laser diode
phase lock
range finder
displacement measurement
A new type of phase-locked laser diode interferometer that uses self-mixing interference in the optical system is described. The self-mixing interference (SMI) signal is obtained easily by optical feedback, i.e., feeding back the laser beam from the object to the laser diode (LD). The SMI signal can be detected by a photodiode in the package of the LD. Therefore, a beamsplitter, reference mirror, and external photodetector are not required, and an interference signal is obtained using a simple optical system. Although the mechanism of SMI is completely different from that of conventional interference, it is shown that the response of the SMI signal to phase changes is the same as that of conventional interference. We used the phase-locked technique to fix the phase change and demonstrated measurement of absolute distance and displacement.
journal article
International Society for Optical Engineering, SPIE
1999-05
application/pdf
Optical Engineering
3
38
543
548
Optical Engineering
AA00333891
00913286
https://niigata-u.repo.nii.ac.jp/record/2213/files/38_3_543-548.pdf
eng
info:doi/10.1117/1.602132
Copyright 1999 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.