We experimentally demonstrated an efficient optical parametric oscillator (OPO) with high parametric conversion from 1.0645 to 3.8 μm. An aperiodically poled magnesium oxide doped lithium niobate wafer was designed and fabricated as the nonlinear crystal of the OPO. A linearly polarized acousto-optic Q-switched Nd:YVO4 laser was used as the pump source. High pump-to-idler conversion efficiency of 18.5% was achieved with a slope efficiency of up to 21.5%. When compared with a periodically poled channel fabricated on the same wafer, under the condition of output coupler optimized for the periodically poled lithium niobate based OPO, an improvement of slope efficiency by 28.3% from 15.2% to 19.5% and total efficiency by 12.5% from 13.6% to 15.3% under the highest pump power of 11 W was realized for the pump-to-idler conversion.
© 2011 Optical Society of America
Lasers and Laser Optics
Original Manuscript: January 11, 2011
Revised Manuscript: February 14, 2011
Manuscript Accepted: February 15, 2011
Published: March 10, 2011
Tao Chen, Bo Wu, Wei Liu, Peipei Jiang, Jian Kong, and Yonghang Shen, "Efficient parametric conversion from 1.06 to 3.8 μm by an aperiodically poled cascaded lithium niobate," Opt. Lett. 36, 921-923 (2011)