[1] Baoguang Gao, Dondong Meng, Zhanduo Qiao, et al. High repetition rate, high peak power mid-infrared optical parametric oscillator based on MgO: PPLN. Infrared and Laser Engineering, 51, 20220069(2022).

[2] Huahang Wang, Jiajia Mao, Shuai Ye, et al. Research progress of high-power 266 nm all-solid-state single-frequency CW laser. Infrared and Laser Engineering, 52, 20220885(2023).

[3] Jianhui Liu, Qiang Liu, Mali Gong. Back conversion in optical parametric process. Acta Phys Sin, 60, 024215(2011).

[4] L Wang, T Xing, S Hu, et al. Mid-infrared ZGP-OPO with a high optical-to-optical conversion efficiency of 75.7%. Opt Express, 25, 3373-3380(2017).

[5] P Wang, X Li, K Wang, et al. Highly-efficient pulsed mid-infrared generation based on intracavity difference frequency mixing. IEEE Photonics Journal, 13, 1500309(2021).

[6] Hui Kong, Jintian Bian, Qing Ye, et al. Comparison of mid-infrared laser generatedby optical parametric oscillation of BaGa₄Se₇ and KTiAsO₄. Infrared and Laser Engineering, 49, 20190423(2020).

[7] J Yao, D Mei, L Bai, et al. BaGa₄Se₇: A new congruent-melting IR nonlinear optical material. Inorganic Chemistry, 49, 9212-9216(2010).

[8] X Zhang, J Yao, W Yin, et al. Determination of the nonlinear optical coefficients of the BaGa₄Se₇ crystal. Optics Express, 23, 552-558(2015).

[9] Hui Kong, Jintian Bian, Jiyong Yao, et al. Temperature tuning of BaGa₄Se₇ optical parametric oscillator. Chinese Optics Letters, 19, 021901(2021).

[10] M Kang, Y Deng, X Yan, et al. A compact and efficient 4.25 μm BaGa₄Se₇ optical parametric oscillator. Chinese Optics Letters, 17, 53-56(2019).

[11] [11] Kong Hui. infrared optical parametric oscillat based on BaGa4Se7 KTiOAsO4 [D]. Changsha: National University of Defense Technology, 2021(in Chinese).

[12] S Brosnan, R Byer. Optical parametric oscillator threshold and linewidth studies. IEEE Journal of Quantum Electronics, 15, 415-431(1979).

[13] X Zhao, C Li, J Bai, et al. Recalibration of the nonlinear optical coefficients of BaGa₄Se₇ crystal using second-harmonic-generation method. Optics Letters, 46, 5894-5897(2021).

[14] Hui Kong, Jintian Bian, Xiaoquan Sun. Calculation of phase-matching angles and effective nonlinear coefficients of BaGa₄Se₇ crystals. Optik, 193, 163004(2019).

[15] [15] Sun Rui. Investigation on LDpumped Nd: YAG intracJavity LBO frequency doubling 659.5 nm669 nm dualwavelength laser[D]. Changchun: Changchun University of Science Technology, 2016. (in Chinese)

[16] V Badikov, D Badikov, G Shevyrdyaeva, et al. Phase-matching properties of BaGa₄S₇ and BaGa₄Se₇: Wide-bandgap nonlinear crystals for the mid-infrared. Phys. Status Solidi RRL, 5, 31-33(2011).

[17] F Yang, J Yao, H Xu, et al. Midinfrared optical parametric amplifier with 6.4–11 μm range based on BaGa₄Se₇. IEEE Photonics Technology Letters, 27, 1100-1103(2015).

[18] E Boursier, P Segonds, J Debray, et al. Angle noncritical phase-matched second-harmonic generation in the monoclinic crystal BaGa₄Se₇. Optics Letters, 40, 4591-4594(2015).

[19] K Kato, K Miyata, V Petrov, et al. Phase-matching properties of BaGa₄Se₇ for SHG and SFG in the 0.901–10.5910 μm range. Applied Optics, 56, 2978-2981(2017).