Active synchronization and carrier phase locking of two separate mode-locked femtosecond lasers

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作者：

R Shelton，LS Ma，H Kapteyn，M Murnane，J Hall，J Ye

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摘要：

Two independent mode-locked femtosecond lasers are synchronized to an unprecedented precision. The rms timing jitter between the lasers is 4.3 fs observed within a 160 Hz bandwidth over tens of seconds, or 26 fs within a 50 kHz bandwidth. Novel multi-stage phase-locked loops help to preserve this ultrahigh timing resolution while setting on arbitrary delay between the two pulse trains (05 ns). Under such synchronization, phase locking between the carrier frequencies of the two femtosecond lasers has been achieved. It is also demonstrated that the same level of synchronization can be achieved with two lasers at different repetition frequencies.

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关键词：

New Development, Experimental/ high-speed optical techniques laser mode locking optical phase locked loops solid lasers synchronisation timing jitter/ two separate mode-locked femtosecond lasers carrier phase locking active synchronization unprecedented precision rms timing jitter bandwidth multi-stage phase-locked loops ultrahigh timing resolution delay two pulse trains carrier frequencies repetition frequencies Tl:sapphire lasers 160 Hz 50 kHz/ A4260F Laser beam modulation, pulsing and switching mode locking and tuning A4280W Ultrafast optical techniques B4330B Laser beam modulation, pulsing and switching mode locking and tuning/ bandwidth 1.6E+02 Hz bandwidth 5.0E+04 Hz