Source: http://proxy.osapublishing.org/oe/abstract.cfm?uri=oe-23-2-1276
Timestamp: 2019-04-21 17:13:25+00:00

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A 15-GHz mode spacing optical frequency comb based on a Kerr-lens mode-locked Yb:Y2O3 ceramic laser has been developed. Individual modes were clearly resolved by a commercial spectrometer. To demonstrate the long-term operation of the optical frequency comb, a single longitudinal mode was phase-locked to a frequency-stabilized continuous wave laser and the repetition rate to a radio frequency standard. To the best of our knowledge, 15 GHz is the largest reported mode spacing (repetition rate) for both a Kerr-lens mode-locked laser and a direct femtosecond laser based-optical frequency comb.
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Fig. 2 (a) Schematic diagram of the experimental configuration used to phase-lock frep and fbeat. HWP (QWP); half (quarter)-wave plate, PBS; polarization beam splitter, VCO; voltage-controlled oscillator, Amp.; RF amplifier, frep (fbeat) detector; 50-GHz (25-GHz) InGaAs photodetector. (b) Spectrum of the phase-locked beat signal between the 15-GHz OFC and the ECDL fbeat. (c) Long-term stability measurement of fbeat (top) and frep (bottom) using frequency counters with a gate time of 1 s.

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