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报道了一种双波长半导体激光二极管(LD)合束端面抽运掺镨氟化钇锂晶体(Pr3+:LiYF4)全固态、单纵模360 nm紫外激光器. 该激光器采用V形折叠腔结构, 利用反射式体布拉格光栅作为波长选择反射镜来压缩光谱线宽, 与法布里-珀罗(F-P)标准具组合构成窄带滤波器进行单纵模的有效选取, 通过I 类位相匹配切割的倍频晶体三硼酸锂对腔内720 nm基频光进行倍频. 在444 nm LD输出功率为1200 mW和469 nm LD输出功率为1400 mW时, 合束抽运获得了功率为112 mW的连续单纵模360 nm紫外激光稳定输出, 光-光转换效率为4.3%. 测量结果表明, 边摸抑制比大于60 dB, 4 h功率均方根值稳定性优于0.5%, 1 h频率漂移小于220 MHz, 激光振幅噪声小于0.5%.
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关键词:
- Pr3+:LiYF4晶体 /
- 单纵模 /
- 反射式体布拉格光栅 /
- 双波长
In recent years, all-solid-state ultraviolet lasers have had widely potential applications in the fields of spectroscopy, biological analysis, precision manufacturing, optical data storage, high-resolution printing, medicine and lithography. The good monochrome of all-solid-state ultraviolet laser can improve the accuracy of spectral absorption measurement when used to detect specific proteins and reduce the laser spot diameter when used for high density data storage or acousto-optic deflector. In this paper, a combined dual-wavelength laser diode (LD) beam end-pumped single longitudinal mode Pr3+:LiYF4 all-solid-state UV laser at 360 nm is presented. A V-folded cavity structure is used in the laser, which consists of a reflective volume Bragg grating (RBG) and a Fabry-Perot (F-P) etalon. The RBG is used as a wavelength selection and resonator reflector to narrow the width of spectral line. The F-P etalon is hybrid in the cavity, serving as a narrow-band filter, to achieve the single longitudinal mode. The lithium triborate crystal with critical type-I phase matching at room temperature is used for implementing the second-harmonic generation of the fundamental 720 nm laser and obtaining an efficient and compact ultraviolet laser at 360 nm. The optical resonator is simulated and analyzed by MATLAB software. Two experiments are conducted to compare the accuracy of central wavelength tuning by changing the temperature of F-P etalon and the angle of F-P etalon. The result shows that the change temperature of F-P etalon can achieve 0.165 pm/℃, showing that it is a better method. The structure of the laser is simplified and the anti-interference capability is improved in this way. It is different from mode competition method and the stability of single longitudinal mode laser output is increased. When the output power of LD at 444 nm is 1200 mW and that of LD at 469 nm is 1400 mW, a single longitudinal mode CW UV laser at 360 nm with output power as high as 112 mW is achieved. The optical-to-optical conversion efficiency is 4.3%, and the longitudinal linewidth of laser is 30 MHz. The measurements show that the edge suppression ratio is greater than 60 dB, the stability of root mean square (RMS) of output power in 4 h is better than 0.5%, the frequency shift in 1h is better than 220 MHz, and amplitude noise is less than 0.5%.-
Keywords:
- Pr3+:LiYF4 crystal /
- single longitudinal mode /
- reflective volume Bragg grating /
- dual-wavelength
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图 2 Pr3+:LiYF4晶体对444 nm和469 nm以及两者加和的吸收效率曲线
Fig. 2. Absorption efficiency curves of Pr3+:LiYF4 crystal for 444 nm LD and 469 nm LD and their hybrid.
图 3 全固态单纵模360 nm紫外激光器
Fig. 3. All solid state single longitudinal mode 360 nm UV laser.
图 4 选模装置 (a) F-P标准具控温装置; (b) F-P标准具角度变换装置
Fig. 4. Longitudinal mode selection device: (a) Temperature control device for F-P etalon; (b) control device for F-P etalon angle.
图 5 谐振腔稳定性分析 (a) 晶体热焦距Rth取300 mm时, 腔内两个束腰半径模拟图; (b) 谐振腔稳定参数G随热焦距Rth的变化
Fig. 5. Stability analysis of optical resonator: (a) Simulation ofbeam waist radii inside Pr3+:LiYF4 and LBO in the resonant cavity when the thermal focal length is 300 mm; (b) the variation curve of the stability parameter G of the resonator with the thermal focal length of the crystal.
图 6 晶体热焦距Rth分别为200, 300, 400 mm时, Pr3+:LiYF4和LBO晶体内束腰半径随着LBO晶体与M1之间距离的变化情况
Fig. 6. The beam waist radii inside Pr3+:LiYF4 and LBO of the resonator vary with the distance between M1 and the LBO crystal when thermal focal length of the crystal is 200, 300 and 400 mm.
图 7 720 nm激光中心波长调谐 (a) 中心波长随F-P标准具温度及厚度的变化; (b) 中心波长随PZT电压及F-P标准具角度的变化
Fig. 7. Tuning of 720 nm laser center wavelength: (a) The central wavelength vary with the temperature and thickness of F-P etalon; (b) the central wavelength vary with the angle of the PZT voltage and F-P etalon.
图 8 360 nm单纵模激光输出功率相对于入射抽运功率 (444 nm与469 nm合束) 的变化
Fig. 8. Variation curve of output power of single longitudinal mode 360 nm laser with respect to pump power (combining LD @ 444 nm and LD @ 469 nm).
表 1 Pr3+:LiYF4晶体蓝光波段峰值吸收截面(室温)
Table 1. Peak absorption cross section of blue light in Pr3+:LiYF4 crystal (room temperature).
Peak wavelength $\lambda $/nm Absorption cross section ${\sigma _{\rm{a}}}$/10－20 cm2 Polarization Corresponding transition Line width/nm 444 9.0 ${\text{π}}$ 3H4→3P2 1.8 469 6.5 ${\text{π}}$ 3H4→3P1+1I6 0.9 479 21.7 ${\text{π}}$ 3H4→3P0 0.5 
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[1] Chen M, Wang Z C, Wang B S, Yang F, Zhang G C, Zhang S J, Zhang F F, Zhang X W, Zong N, Wang Z M, Bo Y, Peng Q J, Cui D F, Wu Y C, Xu Z Y 2016 J. Lumin. 172 254
Google Scholar
[2] 毛叶飞, 张恒利, 徐浏, 邓波, 桑思晗, 何京良, 邢冀川, 辛建国, 江毅 2015 64 014203
Google Scholar
Mao Y F, Zhang H L, Xu L, Deng B, Sang S H, He J L, Xing J C, Xin J G, Jiang Y 2015 Acta Phys. Sin. 64 014203
Google Scholar
[3] Mao Y F, Zhang H L, Sang S H, Zhang X, Yu X L, Xing J C, Xin J G, Jiang Y 2015 Chin. Phys. Lett. 32 094201-1
[4] Cai Z P, Qu B, Cheng Y J, Luo S Y, Xu B, Xu H Y, Luo Z Q, Camy P, Doualan J L, Moncorgé R 2014 Opt. Express 22 31722
Google Scholar
[5] Camy P, Xu B, Doualan J L, Moncorgé R 2011 Advanced Solid-State Photonics Istanbul, Turkey, February 13−16, 2011 pATuB10
[6] Luo S Y, Yan X G, Xu B, Xiao L P, Xu H, Cai Z P, Weng J 2018 Opt. Commun. 406 61
Google Scholar
[7] 刘哲 2013 博士学位论文 (福建: 厦门大学)
Liu Z 2013 Ph. D. Dissertation (Fujian: Xiamen University) (in Chinese)
[8] Akbari R, Major A 2013 Laser Phys. 23 035401
Google Scholar
[9] Ostroumov V, Seelert W, Hunziker L, Ihli C, Richter A, Heumann E, Huber G 2007 Solid State Lasers XVI: Technology and Devices San Jose, USA, January 22−25, 2007 p645103-1
[10] Zhang C M, Yu W X, Zhang C G, Yao Y, Zhu P F, Song P, Bai L 2015 Opt. Spectrosc. 118 998
Google Scholar
[11] Tu X, Wu X, Li M, Liu L Y, Xu L 2012 Opt. Express 20 19996
Google Scholar
[12] 谢仕永, 张小富, 杨程亮, 乐小云, 薄勇, 崔大复, 许祖彦 2016 65 094203
Google Scholar
Xie S Y, Zhang X F, Yang C L, Le X Y, Bo Y, Cui D F, Xu Z Y 2016 Acta Phys. Sin. 65 094203
Google Scholar
[13] George J, Oak S M, Singh B P 2010 Opt. Laser Technol. 42 192
Google Scholar
[14] Yao B, Jing W, Dai T, Ju Y, Wang Y 2017 Opt. Express 25 27671
Google Scholar
[15] Nunez P M, Wetter N U, Zondy J J, Cruz F C 2013 Laser Phys. 23 025801
Google Scholar
[16] Li J, Yang S, Zhao C, Zhang H, Xie W 2010 Opt. Express 18 12161
Google Scholar
[17] Dai T Y, Wu J, Ju L, Zhang Z G, Xu L W, Yao B Q, Wang Y Z 2016 Infrared Phys. Technol. 77 149
Google Scholar
[18] Qian L M, Ren D M, Zhao W J, Liu Y Y, Qu Y C, Bai Y, Chen Z L 2012 Laser Phys. 22 708
Google Scholar
[19] Shie N C, Hsieh W F, Shy J T 2011 Opt. Express 19 21109
Google Scholar
[20] 白扬博, 向望华, 祖鹏, 张贵忠 2012 61 214208
Google Scholar
Bai Y B, Xiang W H, Zu P, Zhang G Z 2012 Acta Phys. Sin. 61 214208
Google Scholar
[21] Qu B, Xu B, Luo S, Cheng Y, Xu H, Cai Z, Camy P, Doualan J, Moncorgé R 2015 IEEE Photon. Technol. Lett. 27 333
Google Scholar
[22] Xu B, Liu Z, Xu H, Cai Z, Zeng C, Huang S, Yan Y, Wang F, Camy P, Doualan J L, Braud A, Moncorgé R 2013 Opt. Commun. 305 96
Google Scholar
[23] Luo S, Yan X, Cui Q, Xu B, Xu H, Cai Z 2016 Opt. Commun. 380 357
Google Scholar
[24] Fibrich M, Šulc J, Jelínková H 2016 Solid State Lasers XXV: Technology and Devices San Francisco, United States, February 15−18, 2016 p97261E-1
[25] Fibrich M, Jelínková H, Šulc J, Nejezchleb K, Škoda V 2010 Solid State Lasers XIX: Technology and Devices San Francisco, United States, February 15−18, 2010 p757828-1
[26] Gün T, Metz P, Huber G 2011 Appl. Phys. Lett. 99 92
[27] Metz P W, Reichert F, Moglia F, Müller S, Marzahl D T, Kränkel C, Huber G 2014 Opt. Lett. 39 3193
Google Scholar
[28] Liu Z, Cai Z P, Huang S L, Zeng C H, Meng Z Y, Bu Y K, Luo Z Q, Xu B, Xu H Y, Ye C C, Stareki F, Camy P, Moncorgé R 2013 J. Opt. Soc. Am. B 30 302
Google Scholar
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