Abstract

We have proposed recently a novel laser frequency measurement system at 1.5 μm wavelength region with 1×10¹⁰ accuracy.^[1] This system is composed of two parts. One is the nonlinear optical frequency convertors to phase-lock a 1,5-μm wavelength semiconductor laser, used as a secondary standard, to two frequency-stabilized He-Ne lasers used as primary standards. Note that a similar phase locking has been also proposed by Telle, et al.^[2] The other part is an “optical frequency comb generator” as a local oscillator to measure the frequency difference between the secondary standard laser and the laser under measurement.

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