Low-threshold, high-repetition-frequency femtosecond optical parametric oscillator based on chirped-pulse frequency conversion
JOSA B, Vol. 20, Issue 6, pp. 1309-1316 (2003)
http://dx.doi.org/10.1364/JOSAB.20.001309
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Abstract
We report a quasi-phase-matched optical parametric oscillator that incorporates a chirped nonlinear crystal and uses prechirped pulses matched to the crystal chirp to improve the conversion efficiency and reduce the operational threshold. A 20-mm crystal of aperiodically poled KTiOPO4 is phase matched to stretched Ti:sapphire pump pulses. The Ti:sapphire laser produces 104-MHz output pulses at 850 nm that are stretched from 190 to 900 fs with an average output power of 750 mW. The system has demonstrated a pump depletion of more than 80%, a signal slope efficiency of 35%, and a threshold of 14.4 mW. The cavity showed tuning from 1194 to 1455 nm over a length range of 130 μm. The approach described demonstrates the potential of using chirped-pulse–chirped-crystal quasi-phase matching in long nonlinear crystals as a method to reduce ultrafast optical parametric oscillator thresholds.
© 2003 Optical Society of America
[Optical Society of America ]
OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.1590) Ultrafast optics : Chirping
(320.2250) Ultrafast optics : Femtosecond phenomena
Citation
Karl A. Tillman, Derryck T. Reid, David Artigas, Jonas Hellström, Valdas Pasiskevicius, and Frederik Laurell, "Low-threshold, high-repetition-frequency femtosecond optical parametric oscillator based on chirped-pulse frequency conversion," J. Opt. Soc. Am. B 20, 1309-1316 (2003)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-20-6-1309
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