Optical frequency combs: From frequency metrology to optical phase control

Jun Ye, H. Schnatz, L.W. Hollberg
2003 IEEE Journal of Selected Topics in Quantum Electronics  
We report the first full stabilization of an optical frequency comb generated from a femtosecond diode-pumped solid-state laser (DPSSL) operating in the 1.5-µm spectral region. The stability of the comb is characterized in free-running and in phase-locked operation by measuring the noise properties of the carrier-envelope offset (CEO) beat, of the repetition rate, and of a comb line at 1558 nm. The high Q-factor of the semiconductor saturable absorber mirror (SESAM)-modelocked 1.5-µm DPSSL
more » ... d 1.5-µm DPSSL results in a low-noise CEO-beat, for which a tight phase lock can be much more easily realized than for a fiber comb. Using a moderate feedback bandwidth of only 5.5 kHz, we achieved a residual integrated phase noise of 0.72 rad rms for the locked CEO, which is one of the smallest values reported for a frequency comb system operating in this spectral region. The fractional frequency stability of the CEO-beat is 20-fold better than measured in a standard self-referenced commercial fiber comb system and contributes only 10 −15 to the optical carrier frequency instability at 1 s averaging time.
doi:10.1109/jstqe.2003.819109 fatcat:q2mqfr72bjd5dlsdraprj4kiie