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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 23 — Aug. 10, 2007
  • pp: 5631–5634

Heterodyne wavelength meter for continuous-wave lasers

Xin Wang, Yan Li, and Shulian Zhang  »View Author Affiliations

Applied Optics, Vol. 46, Issue 23, pp. 5631-5634 (2007)

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A wavelength meter based on a heterodyne interferometer is presented. A single-wavelength test laser beam is modulated to two orthogonal linearly polarized components with different frequencies by a pair of acousto-optic modulators. Then the modulated laser beam and a two-wavelength laser beam are sent to a heterodyne interferometer in a common path. The ratio of two laser interference phase shifts in the heterodyne interferometer is equal to the ratio of their wavelengths. The heterodyne technique measures the heterodyne interference phase but not the interference intensity, which means that it could measure a light source whose intensity is not stable. The heterodyne interference signal is an alternating signal that can easily magnify and process the circuit that makes up the heterodyne wavelength meter and could be used to measure the low-intensity light source even when there are environmental disturbances. A tunable diode laser wavelength range of 630 637   nm has been measured to an accuracy of 5 parts in 10 7 .

© 2007 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 2, 2007
Revised Manuscript: April 19, 2007
Manuscript Accepted: May 19, 2007
Published: August 8, 2007

Xin Wang, Yan Li, and Shulian Zhang, "Heterodyne wavelength meter for continuous-wave lasers," Appl. Opt. 46, 5631-5634 (2007)

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