5:30 PM - 5:45 PM
[15p-C32-15] A Simple Means of Synchronizing Pulse Repetition Frequencies of Two Mode-Locked Lasers
Keywords:Ultrafast Pulsed Laser, Time resolved optical experiments
An ultrafast time-resolved experimental apparatus was constructed using a twin mode-locked laser oscillator of variable cavity lengths, which share an excitation laser and an optical breadboard, for relative stability against environmental fluctuations. Their relative phase of the pulse repetition frequencies at higher harmonics was detected and locked after heterodyne down-conversion using a common microwave oscillator and wave shaping by cascaded limiter amplifier chains. An intensity cross-correlation width of ~70 fs, which was similar to those of auto-correlations, was obtained for a long time by an optical intensity correlator when locked. Time resolved experiments of complex molecular systems are under investigation.