title: High-efficiency near-degenerate PPMgLN optical parametric oscillator with a volume Bragg grating.
abstract: We demonstrate a high-efficiency near-degenerate periodically poled MgO:LiNbO(3) (PPMgLN) optical parametric oscillator (OPO) using a volume Bragg grating (VBG) output coupler (OC) pumped by a multilongitudinal Q-switched Nd:YVO(4) laser at 20 kHz repetition rate. A total parametric power of 4.3 W with a conversion efficiency of 60% is achieved in a double-pass pump configuration. The output power improvement over the case of a single-pass pump is nearly 60%. Both the signal and the idler bandwidths are less than 40 GHz and are confined within 170 GHz bandwidth at 2128.8 nm. Such efficiency is, to our knowledge, the highest ever achieved from a degenerate OPO using a VBG OC.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
authors.forename: Guangyuan
authors.initials: G
authors.lastname: He
authors.forename: Jing
authors.initials: J
authors.lastname: Guo
authors.forename: Zhongxing
authors.initials: Z
authors.lastname: Jiao
authors.forename: Biao
authors.initials: B
authors.lastname: Wang