Low-threshold, high-repetition-frequency femtosecond optical parametric oscillator based on chirped-pulse frequency conversion
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
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.
poled lithium-niobate, generation, laser, efficient, rbtioaso4, phase
IdentifiersURN: urn:nbn:se:kth:diva-22566ISI: 000183361100019OAI: oai:DiVA.org:kth-22566DiVA: diva2:341264
QC 201005252010-08-102010-08-102015-03-30Bibliographically approved