[1] Nie S L, Guan Y C. Review of UV laser and its applications in micromachining[J]. Opto-Electronic Engineering, 44, 1169-1179(2017).

[2] Tang J, Liao J H, Meng H Y et al. Ultraviolet laser and its application in laser processing[J]. Laser & Optoelectronics Progress, 44, 52-56(2007).

[3] He G S, Liu S H[M]. High power optics, 260-262(2011).

[4] Nelson W H, Dasari R, Feld M et al. Intensities of calcium dipicolinate and bacillus subtilis spore Raman spectra excited with 244 nm light[J]. Applied Spectroscopy, 58, 1408-1412(2004). http://europepmc.org/abstract/med/15606952

[5] Shchegrov A V, Lee D, Watson J P. 490-nm coherent emission by intracavity frequency doubling of extended cavity surface-emitting diode lasers[J]. Proceedings of SPIE, 4994, 197-205(2003). http://spie.org/Publications/Proceedings/Paper/10.1117/12.475743

[6] Kaneda Y, Yarborough J M, Li L et al. Continuous-wave all-solid-state 244 nm deep-ultraviolet laser source by fourth-harmonic generation of an optically pumped semiconductor laser using CsLiB6O10 in an external resonator[J]. Optics Letters, 33, 1705-1707(2008). http://www.opticsinfobase.org/abstract.cfm?uri=ol-33-15-1705

[7] Burkley Z, Rasor C, Cooper S F et al. Yb fiber amplifier at 972.5 nm with frequency quadrupling to 243.1 nm[J]. Applied Physics B, 123, 5(2017). http://link.springer.com/10.1007/s00340-016-6583-9

[8] Burkley Z, Brandt A D, Rasor Cet al. Frequency-stabilized deep-UV laser at 243.1 nm with 1. -11-24)[2019-06-02]. https:∥arxiv., org/abs/1811, 09874(2018).

[9] Yao J Q, Xu D G[M]. All solid state laser and nonlinear optical frequency conversion technology, 58-61(2007).

[10] Wang J G, Li Y L, Tian Y H et al. All-solid-state continuous-wave all-intracavity sum-frequency mixing blue laser at 488 nm[J]. Chinese Journal of Lasers, 37, 1669-1672(2010).

[11] Pan S D. The research on characteristics of crystal and performance of diode-pumped Nd∶YLF lasers[D]. Jinan: Shandong Normal University, 16-30(2007).