Phase locking of a mode-locked titanium-sapphire laser-based optical frequency comb to a reference laser using a fast piezoelectric actuator

Shuhei Hatanaka; Kazuhiko Sugiyama; Masatoshi Mitaki; Masatoshi Misono; Sergey N Slyusarev; Masao Kitano

doi:10.1364/AO.56.003615

Phase locking of a mode-locked titanium-sapphire laser-based optical frequency comb to a reference laser using a fast piezoelectric actuator

Appl Opt. 2017 Apr 20;56(12):3615-3621. doi: 10.1364/AO.56.003615.

Authors

Shuhei Hatanaka, Kazuhiko Sugiyama, Masatoshi Mitaki, Masatoshi Misono, Sergey N Slyusarev, Masao Kitano

PMID: 28430232
DOI: 10.1364/AO.56.003615

Abstract

We phase lock an octave-spanning optical frequency comb, generated using a mode-locked titanium-sapphire laser and a photonic-crystal fiber, to a continuous-wave laser line-narrowed to a reference cavity. To phase lock the pulse-repetition frequency, the cavity length of the mode-locked laser is controlled by using a fast piezoelectric-actuated mirror of a servo bandwidth up to 80 kHz. The residual phase noise is 0.35 rad, and 89% of the power is concentrated to the carrier. To apply the system to optical frequency-ratio measurements and to evaluate the phase locking, a simultaneous frequency measurement of the beat between the other mode of the comb and another laser line-narrowed to a different resonance of the common reference cavity is demonstrated.