1-GHz repetition rate femtosecond OPO with stabilized offset between signal and idler frequency combs.
We report an optical parametric oscillator (OPO) based on periodically poled lithium niobate (PPLN) that is synchronously pumped by a femtosecond Ti:sapphire laser at 1 GHz repetition rate. The signal output has a center wavelength of 1558 nm and its spectral bandwidth amounts to 40 nm. The OPO operates in a regime where the signal- and idler frequency combs exhibit a partial overlap around 1600 nm. In this near-degeneracy region, a beat at the offset between the signal and idler frequency combs is detected. Phase-locking this beat to an external reference stabilizes the spectral envelopes of the signal- and idler output. At the same time, the underlying frequency combs are stabilized relative to each other with an instability of 1.5x10(-17) at 1 s gate time.
Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany. Raphael.Gebs@uni-konstanz.de
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D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D008962:Models, Theoretical; D009556:Niobium / Q000737:chemistry* / Q000528:radiation effects*; D010087:Oxides / Q000737:chemistry* / Q000528:radiation effects*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*
D010087:Oxides; D009556:Niobium; C091692:lithium niobate