Method and apparatus for optical frequency measurement

Details Method and apparatus for optical frequency measurement Method and apparatus for optical frequency measurement

2008-01-17

2010-11-09

Lyons, Michael A (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

Reexamination Certificate

active

07830526

ABSTRACT:
A method and an apparatus for optical frequency measurement, using one or two frequency-stabilized mode-locked laser combs operating at different repetition rates to mix with a laser under measurement (LUM) respectively so as to generate two beat frequencies. The ordinal comb number where the beat frequency is generated is determined by measuring the ordinal comb number difference where the two beat frequencies are generated at different repetition rates so as to obtain the frequency of the LUM. The ordinal comb number difference is measured by using a dispersion device to offer an approximate ordinal comb number or by operating a mode-locked laser at three different repetition rates.

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Jin-Long Peng and Ren Huei Shu, Determination of absolute mode number using two mode-locked laser combs in optical frequency metrology, Apr. 16, 2007, 8 pages, vol. 15, Center for Measurement Standards, 321 Section 2. Kuang Fu Road, Hsinchu 30042, Taiwan.
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