Infrared and Laser Engineering, Volume. 49, Issue 7, 20190512(2020)
Miniaturized mid-infrared MgO: PPLN optical parametric oscillator with high beam quality
In order to meet the engineering application of mid-infrared laser, a miniaturized mid-infrared MgO: PPLN optical parametric oscillator (MgO: PPLN-OPO) with high beam quality was presented. The pump source was an acousto-optical Q-switched Nd: YVO4 laser. By pumping the MgO: PPLN crystal, the mid-infrared laser with high efficiency and high peak power was obtained. And the mid-infrared beam quality was improved by adding an aperture in the cavity. The whole laser was cooled by thermoelectric cooling and air cooling. Therefore, the size of the laser was miniaturized. Experimental results indicate that the acousto-optical Q-switched Nd: YVO4 laser can realize the pulse laser with the highest power of 9.3 W at 1.064 μm. The corresponding optical to optical conversion efficiency is 27.2% and the peak power is ~27.5 kW. With the Nd: YVO4 laser pump, the MgO: PPLN-OPO can output the pulse laser at 3.765 μm. When adding the aperture in the cavity, the maximum output power of the MgO: PPLN-OPO decreases from 1.20 W to 1.08 W. However, the beam quality improves obviously. The Mx2 and My2factors change from 1.89 and 1.98 to 1.20 and 1.29, respectively. The pulse width and the peak power of mid-infrared laser are 8.4 ns and ~4.3 kW, respectively.
Get Citation
Copy Citation Text
Xiang Bai, Yang He, Deyang Yu, Kuo Zhang, Fei Chen. Miniaturized mid-infrared MgO: PPLN optical parametric oscillator with high beam quality[J]. Infrared and Laser Engineering, 2020, 49(7): 20190512
Category: 激光器与激光光学
Received: Apr. 2, 2020
Accepted: --
Published Online: Aug. 19, 2020
The Author Email: