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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
[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
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[3] Cheng H P, Liu Y C, Huang T L, Liang H C, Chen Y F 2018 Photonics Res. 6 815
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[11] Thévenin J, Vallet M, Brunel M 2012 Opt. Lett. 37 2859
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[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
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图 1 Nd:MgO:LiNbO3 (Nd:MgO:LN)激光器的激光实验装置图
Figure 1. Diagram of laser experimental setup based on Nd:MgO:LiNbO3 laser.
图 2 Nd:MgO:LiNbO3晶体的偏振荧光光谱
Figure 2. Polarized fluorescence spectra of Nd:MgO:LiNbO3 crystal.
图 3 晶体热焦距和受激发射截面比(
$ \sigma_{1093} $ /$ \sigma _{1084}$ )Figure 3. Ratio of crystal thermal focal length to stimulated emission cross section (
$ \sigma_{1093} $ /$ \sigma_{1084} $ ).
图 4 腔长70 mm、输出镜曲率R = 300 mm时的双波长共振区间
Figure 4. Dual-wavelength resonance range when the cavity length is 70 mm and the output mirror curvature R = 300 mm
图 5 腔长100 mm、输出镜曲率R = 300 mm时的双波长共振区间
Figure 5. Dual-wavelength resonance range when the cavity length is 100 mm and the output mirror curvature R = 300 mm.
图 6 腔长100 mm、输出镜曲率R = 150 mm时的双波长共振区间
Figure 6. Dual-wavelength resonance range when the cavity length is 100 mm and the output mirror curvature R = 150 mm.
图 7 不同透过率下, 谐振腔1的激光输出功率特性
Figure 7. Resonator cavity 1 laser output power characteristics.
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
Figure 8. Change process and spectrum of 1084 and 1093 nm dual-wavelength laser output for resonator cavity 1.
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
Figure 9. Polarization states of 1084 and 1093 nm laser wavelengths: (a) Polarization states of 1084 nm; (b) polarization states of 1093 nm.
图 10 谐振腔2激光输出功率特性
Figure 10. Resonator cavity 2 laser output power characteristics
图 11 谐振腔3激光输出功率特性
Figure 11. Resonator cavity 3 laser output power characteristics
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
Figure 12. 1084 nm and 1093 nm spots and the beam quality obtained by fitting: (a) 1084 nm; (b) 1093 nm.
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 
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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.
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[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 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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