Chinese Optics Letters, 2017, 15 (9): 091902, Published Online: Jul. 19, 2018
Injection-seeded single frequency 2.05 μm output by ring cavity optical parametric oscillator
190.4410 Nonlinear optics, parametric processes 190.4970 Parametric oscillators and amplifiers 140.3070 Infrared and far-infrared lasers
Abstract
An injection-seeded single-resonant optical parametric oscillator (SROPO) with single frequency nanosecond pulsed 2.05 μm wavelength output is presented. Based on two potassium titanyl phosphate crystals and pumped by a 1064 nm single frequency laser pulse, injection seeding is performed successfully by using the ramp-hold-fire technique in a ring cavity with a bow-tie configuration. The SROPO provides 2.65 mJ single frequency signal pulse output with a 17.6 ns pulse duration at a 20 Hz repetition rate. A near-diffraction-limited beam is achieved with a beam quality factor M 2 of about 1.2. The spectrum linewidth of the signal pulse is around 26.4 MHz, which is almost the Fourier-transform-limited value.
Xiaobing Xie, Xiaolei Zhu, Shiguang Li, Xiuhua Ma, Xiao Chen, Yanguang Sun, Huaguo Zang, Jiqiao Liu, Weibiao Chen. Injection-seeded single frequency 2.05 μm output by ring cavity optical parametric oscillator[J]. Chinese Optics Letters, 2017, 15(9): 091902.