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Low-threshold, high-repetition-frequency femtosecond optical parametric oscillator based on chirped-pulse frequency conversion
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2003 (English)In: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, Vol. 20, no 6, 1309-1316 p.Article in journal (Refereed) Published
Abstract [en]

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 mum. 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.

Place, publisher, year, edition, pages
2003. Vol. 20, no 6, 1309-1316 p.
Keyword [en]
poled lithium-niobate, generation, laser, efficient, rbtioaso4, phase
URN: urn:nbn:se:kth:diva-22566ISI: 000183361100019OAI: diva2:341264
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2015-03-30Bibliographically approved

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Pasiskevicius, ValdasLaurell, Fredrik
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