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Applied Optics

Applied Optics


  • Vol. 25, Iss. 17 — Sep. 1, 1986
  • pp: 2976–2980

Distance measurement by the wavelength shift of laser diode light

Hisao Kikuta, Koichi Iwata, and Ryo Nagata  »View Author Affiliations

Applied Optics, Vol. 25, Issue 17, pp. 2976-2980 (1986)

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This paper proposes a method for measuring distance larger than the wavelength of light with an interferometer using a laser diode. This method uses the fact that the wavelength of the emitted light of a laser diode varies in proportion to the diode’s injection current. The phase difference between the two interfering beams varies due to the sinusoidal variation of wavelength. The variation of the phase difference is detected by the optical heterodyne method. The magnitude of the variation is proportional to the measuring distance and the light wavelength shift. If the wavelength shift is known, a distance larger than the wavelength can be obtained from measurement of the phase variation. This method is a kind of multiwavelength interferometry using a single light source. We have done some fundamental experiments with this method and have confirmed its applicability to practical applications.

© 1986 Optical Society of America

Original Manuscript: March 5, 1986
Published: September 1, 1986

Hisao Kikuta, Koichi Iwata, and Ryo Nagata, "Distance measurement by the wavelength shift of laser diode light," Appl. Opt. 25, 2976-2980 (1986)

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