We show an experimental proof of concept for a nonresonant recirculation method to increase the conversion efficiency of second-harmonic generation (SHG) with type II phase matching. As much as a factor-of-4 efficiency increase compared with that of single-pass SHG is possible, provided that the recirculation length is within the coherence length of the pump laser. Nonresonant recirculating SHG may be valuable in systems in which intracavity doubling is not practicable, such as high-power cw bulk solid-state or fiber lasers.
© 2004 Optical Society of America
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(220.4830) Optical design and fabrication : Systems design
(230.4320) Optical devices : Nonlinear optical devices
T. Sean Ross and Gerald T. Moore, "Nonresonant Recirculating Type II Second-Harmonic Generator," Appl. Opt. 43, 2353-2359 (2004)