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Pulse Timing Stabilization of a Mode-Locked Laser Using an External Phase Modulator

A new technique is proposed and demonstrated for stabilizing the pulse timing of a mode-locked laser by the use of an electro-optic phase modulator placed outside the laser cavity. The output pulses are phase-locked to an electrical reference oscillator by controlling the phase modulator and the laser cavity length simultaneously. The experiment is carried out using a laser diode-pumped Cr:LiSAF laser operating at 100 MHz and a timing jitter of 4.2 fs relative to the reference has been achieved for a bandwidth of 25 mHz–10 kHz.