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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 6 — Feb. 20, 2007
  • pp: 930–934

Direct frequency counting with enhanced beat signal-to-noise ratio for absolute frequency measurement of a He–Ne∕I2 laser at 633 nm

Won-Kyu Lee, Dae-Su Yee, and Ho Suhng Suh  »View Author Affiliations

Applied Optics, Vol. 46, Issue 6, pp. 930-934 (2007)

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We obtain a heterodyne beat signal between an iodine-stabilized He–Ne laser at 633 nm and a low power comb mode of an optical frequency synthesizer with an enhanced signal-to-noise ratio (SNR) up to 35   dB . This is accomplished by the adoption of a fiber coupler and the reduction of the shot noise induced by adjacent comb modes. SNR is improved more than 15 dB compared with that of conventional methods. We measure the absolute frequency of the He–Ne laser mentioned above directly utilizing the enhanced SNR. A quantitative analysis of SNR and some information on experimental criteria for the correct frequency counting are given.

© 2007 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.3940) Instrumentation, measurement, and metrology : Metrology
(230.5160) Optical devices : Photodetectors

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 30, 2006
Manuscript Accepted: November 20, 2006
Published: February 2, 2007

Won-Kyu Lee, Dae-Su Yee, and Ho Suhng Suh, "Direct frequency counting with enhanced beat signal-to-noise ratio for absolute frequency measurement of a He-Ne/I2 laser at 633 nm," Appl. Opt. 46, 930-934 (2007)

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