双端泵浦Nd<sup>3+</sup>掺杂MgO:LiNbO<sub>3</sub>正交偏振双波长连续激光调控

刘鸿志; 王宇恒; 郑浩; 赵云峰; 于永吉; 金光勇

doi:10.7498/aps.70.20210449

摘要

报道了一种采用双端泵浦的Nd³⁺离子掺杂MgO:LiNbO₃正交偏振双波长激光器, 并对正交偏振双波长激光输出进行调控. 基于晶体的偏振荧光光谱, 对1084与1093 nm的双波长激光振荡机理进行分析, 建立晶体热透镜焦距与受激发射截面比之间的关系, 并推导出1084及1093 nm双波长共振区间, 给出通过改变谐振腔腔型结构调控双波长激光输出的方法. 在实验中采用813 nm的半导体激光器双端泵浦a切的Nd:MgO:LiNbO₃晶体, 测量了1084与1093 nm两种波长的输出规律, 并对输出波长进行调控. 最终得到了6.02 W的1093 nm和3.02 W的1084 nm单波长激光输出, 在X, Y方向上的光束质量分别为$ M_X^2 $ = 1.70和$ M_Y^2 $ = 1.81. 在28 W泵浦注入功率下获得了4.58 W的双波长激光输出, 实验结果与理论分析相符合. 为正交偏振双波长的可控输出及应用奠定了理论和实验基础.

关键词:

Abstract

In this paper, an orthogonally polarized dual-wavelength laser based on dual-end pumped Nd³⁺doped MgO:LiNbO₃ is reported. Besides, the output wavelength of the orthogonally polarized dual-wavelength is regulated. According to the crystal character, the polarized fluorescence spectrum of the crystal is chosen as the starting point. The oscillation mechanism of the dual-wavelength Nd³⁺doped MgO:LiNbO₃ laser at 1084 nm and 1093 nm is analyzed theoretically. The relationship between the focal length of the crystal thermal lens and the stimulated emission cross-sectional ratio is established, and the effects of different temperatures on the output of single-wavelength Nd³⁺doped MgO:LiNbO₃ laser and on the output of dual-wavelength Nd³⁺doped MgO:LiNbO₃ laser are analyzed. In addition, The single-wavelength output region of 1084 nm and 1093 nm are derived respectively, and the mixed dual-wavelength working area at 1084 nm and 1093 nm are also given. The influences of different resonator parameters on the output dual-wavelength Nd³⁺doped MgO:LiNbO₃ laser are analyzed. It is worth mentioning that a method of adjusting the output of dual-wavelength laser by changing the resonant cavity structure is given. In the experiment, a-cut Nd:MgO:LiNbO₃ crystal is double-end pumped by an semiconductor laser, of which the output wavelength is 813 nm. The output law of the two wavelengths of 1084 nm and 1093 nm is summarized. The output wavelength is regulated. When the laser cavity is not inserted by other optical elements, the maximum output power of 4.58 W at 1084 nm/1093 nm dual-wavelength laser under the pump power is 28 W and the pure single-wavelength laser maximum output power of 3.02 W at 1084 nm and 6.02 W at 1093 nm are obtained. The beam quality factor in the X- and Y-direction are $ M_X^2 $ = 1.70 and $ M_Y^2 $ = 1.81, respectively. The experimental results are in agreement with the theoretical analysis results. According to the change of the resonator parameters, the 1084 nm and 1093 nm pure single-wavelength laser alternate output and orthogonal polarization dual-wavelength laser synchronous output are achieved based on the Nd³⁺doped MgO:LiNbO₃ laser, thus establishing a theoretical and experimental foundation for the controllable output and application of orthogonal polarization dual-wavelength. It greatly expand the application range of dual-wavelength laser which can control the orthogonal polarization of 1084/1093 nm.

Keywords:

dual-wavelength of 1084 nm and 1093 nm /
Nd:MgO:LiNbO₃ /
orthogonal polarization /
regulating wavelength

作者及机构信息

长春理工大学理学院, 吉林省固体激光技术与应用重点实验室, 长春　130022

通信作者: 于永吉, yyjcust@163.com

基金项目: 国家自然科学基金(批准号: 11974060, U20A20214)和吉林省科技厅中青年科技创新领军人才及团队项目(批准号: 20190101004JH)资助的课题

Authors and contacts

Jilin Provincial Key Laboratory of Solid Laser Technology and Application, School of Science, Changchun University of Science and Technology, Changchun 130022, China

Corresponding author: Yu Yong-Ji, yyjcust@163.com

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11974060, U20A20214) and the Young and Middle-aged Scientific and Technological Innovation Leaders and Team Project of Jilin Provincial Department of Science and Technology, China (Grant No. 20190101004JH)

文章全文

参考文献

[1]	Walsh B M 2010 Laser Phys. 20 622 Google Scholar
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[8]	Xu B, Wang Y, Lin Z L, Cui S W, Cheng Y J, Xu H Y, Cai Z P 2016 Appl. Opt. 55 42 Google Scholar
[9]	刘欢, 姚建铨, 郑芳华, 路洋, 王鹏 2008 物理学报 57 230 Google Scholar Liu H, Yao J Q, Zheng F H, Lu Y, Wang P 2008 Acta Phys. Sin. 57 230 Google Scholar
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[11]	Thévenin J, Vallet M, Brunel M 2012 Opt. Lett. 37 2859 Google Scholar
[12]	Tuan P H, Tsai M C, Chen Y F 2017 Opt. Express 25 29000 Google Scholar
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[14]	Qi J, Liu C, Dai C, Liu L, Wang X Z 2019 Laser Phys. 29 115001 Google Scholar
[15]	Fan M Q, Li T, Zhao S Z, Li G Q, Li D C, Yang K J, Qiao W C, Li S X 2016 Opt. Mater. 53 209 Google Scholar
[16]	Wang Y H, Yu Y J, Sun D H, Liu H, Liu H Y, Li S T, Wu C T, Jin G Y 2019 Opt. Laser Technol. 119 105570 Google Scholar
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施引文献

图 1 Nd:MgO:LiNbO₃ (Nd:MgO:LN)激光器的激光实验装置图

Fig. 1. Diagram of laser experimental setup based on Nd:MgO:LiNbO₃ laser.

下载: 全尺寸图片幻灯片

图 2 Nd:MgO:LiNbO₃晶体的偏振荧光光谱

Fig. 2. Polarized fluorescence spectra of Nd:MgO:LiNbO₃ crystal.

下载: 全尺寸图片幻灯片

图 3 晶体热焦距和受激发射截面比($ \sigma_{1093} $/$ \sigma _{1084}$)

Fig. 3. Ratio of crystal thermal focal length to stimulated emission cross section ($ \sigma_{1093} $/$ \sigma_{1084} $).

下载: 全尺寸图片幻灯片

图 4 腔长70 mm、输出镜曲率R = 300 mm时的双波长共振区间

Fig. 4. Dual-wavelength resonance range when the cavity length is 70 mm and the output mirror curvature R = 300 mm

下载: 全尺寸图片幻灯片

图 5 腔长100 mm、输出镜曲率R = 300 mm时的双波长共振区间

Fig. 5. Dual-wavelength resonance range when the cavity length is 100 mm and the output mirror curvature R = 300 mm.

下载: 全尺寸图片幻灯片

图 6 腔长100 mm、输出镜曲率R = 150 mm时的双波长共振区间

Fig. 6. Dual-wavelength resonance range when the cavity length is 100 mm and the output mirror curvature R = 150 mm.

下载: 全尺寸图片幻灯片

图 7 不同透过率下, 谐振腔1的激光输出功率特性

Fig. 7. Resonator cavity 1 laser output power characteristics.

下载: 全尺寸图片幻灯片

图 8 谐振腔1的1084与1093 nm双波长激光输出的变化过程与光谱

Fig. 8. Change process and spectrum of 1084 and 1093 nm dual-wavelength laser output for resonator cavity 1.

下载: 全尺寸图片幻灯片

图 9 1084和1093 nm激光波长的偏振态　(a) 1084 nm偏振态; (b) 1093 nm偏振态

Fig. 9. Polarization states of 1084 and 1093 nm laser wavelengths: (a) Polarization states of 1084 nm; (b) polarization states of 1093 nm.

下载: 全尺寸图片幻灯片

图 10 谐振腔2激光输出功率特性

Fig. 10. Resonator cavity 2 laser output power characteristics

下载: 全尺寸图片幻灯片

图 11 谐振腔3激光输出功率特性

Fig. 11. Resonator cavity 3 laser output power characteristics

下载: 全尺寸图片幻灯片

图 12 1084 nm和1093 nm光斑及拟合得到的光束质量　(a) 1084 nm; (b) 1093 nm

Fig. 12. 1084 nm and 1093 nm spots and the beam quality obtained by fitting: (a) 1084 nm; (b) 1093 nm.

下载: 全尺寸图片幻灯片

表 1 谐振腔模拟参数

Table 1. Parameters of cavity simulation.

编号 M1曲率 M2曲率/mm 谐振腔长度/mm

1 ∞ 300 70
2 ∞ 300 100
3 ∞ 150 100

下载: 导出CSV

表 2 Nd:MgO:LiNbO₃晶体的正交偏振双波长激光器镀膜参数

Table 2. Coating parameters of orthogonal polarization dual-wavelength laser based on Nd:MgO:LiNbO₃ crystal.

编号材质膜系参数

M1 K9 1084 nm@HR, 813 nm@HT
M2 K9 1084 nm@AR (T = 6%, 10%, 15%)
BS1 K9 45° 1084 nm@HR, 813 nm@HT
P K9 1080—1090 nm 45°偏振膜

注: HR代表高反射率, HT代表高透射率.

下载: 导出CSV

[1]	Walsh B M 2010 Laser Phys. 20 622 Google Scholar
[2]	Zhang Z L, Liu Q, Nie M M, Ji E C, Gong M L 2015 Appl. Phys. B 20 689 Google Scholar
[3]	Cheng H P, Liu Y C, Huang T L, Liang H C, Chen Y F 2018 Photonics Res. 6 815 Google Scholar
[4]	Duan X M, Li L J, Shen Y J, Yao B Q, Wang Y Z 2018 Appl. Opt. 57 8102 Google Scholar
[5]	Zhang P, Tan Y D, Liu N, Wu Y, Zhang S L 2013 Opt. Lett. 38 4296 Google Scholar
[6]	Liang H C, Wu C S 2017 Opt. Express 26 13697 Google Scholar
[7]	Zhang X L, Zhang S, Wang C Y, Li L, Zhao J Q, Cui J H 2013 Opt. Express 21 22699 Google Scholar
[8]	Xu B, Wang Y, Lin Z L, Cui S W, Cheng Y J, Xu H Y, Cai Z P 2016 Appl. Opt. 55 42 Google Scholar
[9]	刘欢, 姚建铨, 郑芳华, 路洋, 王鹏 2008 物理学报 57 230 Google Scholar Liu H, Yao J Q, Zheng F H, Lu Y, Wang P 2008 Acta Phys. Sin. 57 230 Google Scholar
[10]	Lu Y F, Zhang J, Xia J, Liu H L 2014 IEEE Photonics Technol. Lett. 26 656 Google Scholar
[11]	Thévenin J, Vallet M, Brunel M 2012 Opt. Lett. 37 2859 Google Scholar
[12]	Tuan P H, Tsai M C, Chen Y F 2017 Opt. Express 25 29000 Google Scholar
[13]	Tu Z H, Dai S B, Yin H, Zhu S Q 2019 Opt. Express 27 32949 Google Scholar
[14]	Qi J, Liu C, Dai C, Liu L, Wang X Z 2019 Laser Phys. 29 115001 Google Scholar
[15]	Fan M Q, Li T, Zhao S Z, Li G Q, Li D C, Yang K J, Qiao W C, Li S X 2016 Opt. Mater. 53 209 Google Scholar
[16]	Wang Y H, Yu Y J, Sun D H, Liu H, Liu H Y, Li S T, Wu C T, Jin G Y 2019 Opt. Laser Technol. 119 105570 Google Scholar
[17]	Cordova-Plaza A, Fan T Y, Digonnet M J F, Byer R L, Shaw H J 1988 Opt. Lett. 13 209 Google Scholar
[18]	Burlot R, Moncorgé R, Manaa H, Boulon G, Guyot Y, Garcia Solé J, Cochet-Muchy D 1996 Opt. Mater. 6 313 Google Scholar
[19]	De Almeida José M M M, Leite António M P P, Amin J 2000 Proc. SPIE 3942 232 Google Scholar
[20]	Cox L J 1977 Opt. Acta Int. J. Opt. 24 995 Google Scholar
[21]	赫光生, 刘凤兰, 朱大庆 1978 激光 5 6 Google Scholar He G S, Liu F L, Zhu D Q 1978 Chin. J. Lasers 5 6 Google Scholar

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双端泵浦Nd³⁺掺杂MgO:LiNbO₃正交偏振双波长连续激光调控