Abstract
Two asynchronous, broadband 3.3+µm pulse trains with a stabilized repetition+rate difference of up to 5+kHz were generated from a single optical parametric oscillator. With additional carrier+envelope+offset stabilization, it could be applied to coherent dual+frequency+comb spectroscopy.
Highlights
Dual-laser pulse trains with slightly different repetition rates are needed for asynchronous optical sampling (AOS) and dual frequency-comb spectroscopy (DFCS) [1,2,3,4]
In recent work we reported a synchronously-pumped Optical parametric oscillators (OPOs) (SPOPO) producing broadband midIR pulses from a cavity containing a long MgO:PPLN crystal [5]
We report the first, to our knowledge, SPOPO pumped by a pair of asynchronous pulse trains
Summary
Dual-laser pulse trains with slightly different repetition rates are needed for asynchronous optical sampling (AOS) and dual frequency-comb spectroscopy (DFCS) [1,2,3,4]. The high intracavity dispersion of this OPO made it insensitive to cavity-length variations, giving oscillation over a 120-μm range (equivalent to an 8-kHz repetition-rate detuning) with only 3 nm of signal tuning. This insensitivity can be exploited to allow the OPO to be pumped simultaneously by two lasers with different repetition rates, enabling asynchronous signal / idler pulse trains to be generated with only with slightly different central wavelengths. We report the first, to our knowledge, SPOPO pumped by a pair of asynchronous pulse trains
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