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http://dx.doi.org/10.3807/JOSK.2015.19.4.357

Improvement of a Pound-Drever-Hall Technique to Measure Precisely the Free Spectral Range of a Fabry-Perot Etalon  

Seo, Dong-Sun (Department of Electronics, Myongji University)
Park, Chongdae (Department of Electronics, Myongji University)
Leaird, Daniel E. (School of Electrical & Computer Engineering, Purdue University)
Weiner, Andrew M. (School of Electrical & Computer Engineering, Purdue University)
Publication Information
Journal of the Optical Society of Korea / v.19, no.4, 2015 , pp. 357-362 More about this Journal
Abstract
We examine the principle of a modified Pound-Drever-Hall (PDH) technique to measure the free spectral range of a Fabry-Perot etalon (FPE). The FPE's periodic transmission of phase-modulated light allows us to adopt a sampling theorem to develop a new relationship for the PDH error signal. This leads us to find the key parameters governing the measurement accuracy: the phase modulation index ${\beta}$ and the FPE finesse. Without any additional complexity for background noise reduction, we achieve a measurement accuracy of 0.5 ppm. The improvement is mainly attributed to the wide-band phase modulation approaching ${\beta}=10$, and partly to the use of both reflected and transmitted light from the FPE and good FPE finesse.
Keywords
Fabry-Perot etalon; Free spectral range; Pound-Drever-Hall technique; Optical frequency stabilization;
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Times Cited By KSCI : 1  (Citation Analysis)
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