title: Mid-infrared ZGP-OPO with a high optical-to-optical conversion efficiency of 75.7.
abstract: We experimentally demonstrate a ZnGeP2based optical parametric oscillator (ZGP-OPO) with a record of the optical-to-optical conversion efficiency. To improve the conversion efficiency, we design and construct a double-pass pumped high-gain OPO and a matched large-sized high-peak-power pump beam to suppress the spatial walk-off and conversion. Pulse energy of 19 mJ with pulse width of 27.8 ns at 5 Hz in the mid-infrared 3-5 μm waveband is obtained in the doubly resonated ZGP-OPO, the beam quality M2is about 9.6, and the corresponding optical-to-optical conversion efficiency reaches up to 75.7%.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Tinglun
authors.initials: T
authors.lastname: Xing
authors.forename: Shuwu
authors.initials: S
authors.lastname: Hu
authors.forename: Xianyou
authors.initials: X
authors.lastname: Wu
authors.forename: Haixin
authors.initials: H
authors.lastname: Wu
authors.forename: Jiyang
authors.initials: J
authors.lastname: Wang
authors.forename: Haihe
authors.initials: H
authors.lastname: Jiang