[1] Witte U, Schneider F, Traub M, et al. kW-class direct diode laser for sheet metal cutting based on DWDM of pump modules by use of ultra-steep dielectric filters[J]. Optics Express, 24, 22917-22929(2016).

[2] [2] Pietrzak A, Zn M, Huelsewede R, et al. Development of highly efficient laser diodes emitting around 1060nm f medical industrial applications[C]Proceedings of SPIE 10900, HighPower Diode Laser Technology XVII. 2019: 109000K.

[3] [3] Shimada N, Yukawa M, Shibata K, et al. 640nm laser diode f small laser display[C]Proceedings of SPIE 7198, HighPower Diode Laser Technology Applications VII. 2009: 719806.

[4] Franken P A, Hill A E, Peters C W, et al. Generation of optical harmonics[J]. Physical Review Letters, 7, 118-119(1961).

[5] Edmonds H, Smith A. Second-harmonic generation with the GaAs laser[J]. IEEE Journal of Quantum Electronics, 6, 356-360(1970).

[6] Yamamoto K, Yamamoto H, Taniuchi T. Simultaneous sum-frequency and second-harmonic generation from a proton-exchanged MgO-doped LiNbO₃ waveguide[J]. Applied Physics Letters, 58, 1227-1229(1991).

[7] Müller A, Jensen O B, Hasler K H, et al. Efficient concept for generation of diffraction-limited green light by sum-frequency generation of spectrally combined tapered diode lasers[J]. Optics Letters, 37, 3753-3755(2012).

[8] [8] Hansen A K, Jensen O B, ersen P E, et al. 5.5 W of diffractionlimited green light generated by SFG of tapered diode lasers in a cade of nonlinear crystals[C]Frontiers in Optics 2015. 2015: FTu2F. 3.

[9] Zhu Zhanda, Jiang Menghua, Yu Haoyang, et al. Generation of blue light by sum-frequency generation of a spectrally combined broad-area diode laser array[J]. Optics Letters, 41, 4712-4714(2016).

[10] Zhou Pu, Suo Rongtao, Ma Yanxing, . Review of coherent laser beam combining research progress in the past decade[J]. Chinese Journal of Lasers, 48, 0401003(2021).

[11] Wang Liju, Peng Hangyu, Zhang Jun. Advance on high power diode laser coupling[J]. Chinese Optics, 8, 517-534(2015).

[12] Zhu Hongbo, Lin Xingchen, Zhang Yawei, et al. kW-class fiber-coupled diode laser source based on dense spectral multiplexing of an ultra-narrow channel spacing[J]. Optics Express, 26, 24723-24733(2018).

[13] Zhu Hongbo, Duan Xiaoming, Fan Shengli, et al. Scalable structure of coherent polarization beam combining based on tapered diode laser amplifiers[J]. Optics & Laser Technology, 132, 106470(2020).

[14] Albrodt P, Niemeyer M, Crump P, et al. Coherent beam combining of high power quasi continuous wave tapered amplifiers[J]. Optics Express, 27, 27891-27901(2019).

[15] Daneu V, Sanchez A, Fan T Y, et al. Spectral beam combining of a broad-stripe diode laser array in an external cavity[J]. Optics Letters, 25, 405-407(2000).

[16] Daniault L, Hanna M, Lombard L, et al. Coherent beam combining of two femtosecond fiber chirped-pulse amplifiers[J]. Optics Letters, 36, 621-623(2011).

[17] Meng Huicheng, Tan Hao, Li Jianmin. Development of spectral beam combining of diode laser by grating and external cavity[J]. Laser & Optoelectronics Progress, 52, 020003(2015).

[18] Zheng Ye, Yang Yifeng, Wang Jianhua, et al. 10.8 kW spectral beam combination of eight all-fiber superfluorescent sources and their dispersion compensation[J]. Optics Express, 24, 12063-12071(2016).

[19] (Yu Lingjie. Development of patent technology for laser beam combination[J]. New Technologies & New Products of China, 139-140(2020).

[20] Jung A, Song S, Kim S, et al. Numerical analyses of a spectral beam combining multiple Yb-doped fiber lasers for optimal beam quality and combining efficiency[J]. Optics Express, 30, 13305-13319(2022).

[21] Zhang Jun, Peng Hangyu, Cao Junsheng, . 970 nm hundred-watt level diode laser source by spectral beam combining with external cavity feedback[J]. Acta Optica Sinica, 33, 1114001(2013).

[22] Wang Lijun, Peng Hangyu, Zhang Jun, . Development of beam combining of high power high brightness diode lasers[J]. Infrared and Laser Engineering, 46, 0401001(2017).

[23] [23] Jechow A, Skoczowsky D, Lichtner M, et al. Highbrightness emission from stripearray broad area diode lasers operated in offaxis external cavities[C]Proceedings of SPIE 7583, HighPower Diode Laser Technology Applications VIII. 2010: 758312.

[24] Vijayakumar D, Jensen O B, Thestrup B. 980 nm high brightness external cavity broad area diode laser bar[J]. Optics Express, 17, 5684-5690(2009).

[25] Sun Fangyuan, Shu Shili, Zhao Yufei, et al. High-brightness diode lasers obtained via off-axis spectral beam combining with selective feedback[J]. Optics Express, 26, 21813-21818(2018).

[26] Zhao Yufei, Sun Fangyuan, Tong Cunzhu, et al. Going beyond the beam quality limit of spectral beam combining of diode lasers in a V-shaped external cavity[J]. Optics Express, 26, 14058-14065(2018).

[27] Lang R, Kobayashi K. External optical feedback effects on semiconductor injection laser properties[J]. IEEE Journal of Quantum Electronics, 16, 347-355(1980).

[28] Meng Huicheng, Wu Deyong, Tan Hao, . Experimental study on high brightness and narrow band of diode laser by spectral beam combining of grating-external cavity[J]. Chinese Journal of Lasers, 42, 0302003(2015).

[29] Liu Liangqing, Yuan Xiao, Lü Chao. The crystal-length and acceptance parameters of SFG with biaxial crystals[J]. Laser Technology, 31, 232-234,245(2007).