We report on the investigation of thermal effects in high-repetition-rate pulsed optical parametric oscillators emitting in the mid-IR. We find that the thermal load induced by the nonresonant idler absorption plays a critical role in the emergence of thermally induced bistability. We then demonstrate a significant improvement of the conversion efficiency (more than 30%) when a proper axial temperature gradient is applied to the nonlinear crystal by use of a two-zone temperature-controlled oven.
© 2010 Optical Society of America
Original Manuscript: July 21, 2010
Revised Manuscript: September 27, 2010
Manuscript Accepted: October 6, 2010
Published: October 27, 2010
Antoine Godard, Myriam Raybaut, Thomas Schmid, Michel Lefebvre, Anne-Marie Michel, and Michel Péalat, "Management of thermal effects in high-repetition-rate pulsed optical parametric oscillators," Opt. Lett. 35, 3667-3669 (2010)