Nd:YVO_4晶体π和σ偏振激光的实现及性能研究
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摘要
利用偏振分束器(PBS)选择性地实现a轴切割Nd:YVO_4晶体π和σ偏振的激光输出的实验研究。四方晶系Nd:YVO_4晶体偏振荧光光谱的差异,导致了输出π和σ偏振激光的性能差别。实验中利用PBS的反射光束主动选偏,结合激光晶体沿通光方向旋转,分别对a轴切割Nd:YVO_4晶体的~4F_(3/2)～~4I_(11/2)和~4F_(3/2)～~4I_(13/2)能级跃迁的偏振激光性能进行测试。在11 W的入射抽运功率下,基于~4F_(3/2)～~4I_(11/2)能级跃迁分别获得了5.5 W的π偏振1064.3nm激光输出和4.4 W的σ偏振1066.7nm激光输出;基于~4F_(3/2)～~4I_(13/2)能级跃迁分别获得了2.9 W的π偏振激光输出和1.6 W的σ偏振激光输出,但波长均为1341.8nm。实验结果表明:a轴切割Nd:YVO_4晶体的π偏振激光输出有更高的转换效率,而σ偏振激光输出则有更长的激光谱线。
π-andσ-polarization laser emission in a-cut Nd:YVO_4 crystal are selectively realized with a polarization beam splitter(PBS).The difference of polarized fluorescence spectra of tetragonal Nd:YVO_4 crystal results in the performance difference between theπ-andσ-polarization laser outputs.Theπ-andσ-polarization laser performances of a-cut Nd:YVO_4 crystal with ~4F_(3/2) to ~4I_(11/2) and ~4F_(3/2) to ~4I_(13/2) energy level transitions are investigated by rotating the laser crystal along the optical direction and active polarization selection of PBS reflected beam.When the pump power is 11 W,π-polarization laser at 1064.3nm with output power of 5.5Wandσ-polarization laser at 1066.7nm with output power of 4.4 W are obtained for the ~4F_(3/2)-~4I_(11/2) energy level transition,respectively.While for the ~4F_(3/2)-~4I_(13/2) energy level transition,π-polarization laser at 1341.8nm with output power of 2.9 Wandσ-polarization laser at 1341.8nm with output power of 1.6 Ware obtained,respectively.The experimental results show that theπ-polarization laser has higher conversion efficiency and theσ-polarization laser owns longer laser spectrum for a-cut Nd:YVO_4 crystal.
π-andσ-polarization laser emission in a-cut Nd:YVO_4 crystal are selectively realized with a polarization beam splitter(PBS).The difference of polarized fluorescence spectra of tetragonal Nd:YVO_4 crystal results in the performance difference between theπ-andσ-polarization laser outputs.Theπ-andσ-polarization laser performances of a-cut Nd:YVO_4 crystal with ~4F_(3/2) to ~4I_(11/2) and ~4F_(3/2) to ~4I_(13/2) energy level transitions are investigated by rotating the laser crystal along the optical direction and active polarization selection of PBS reflected beam.When the pump power is 11 W,π-polarization laser at 1064.3nm with output power of 5.5Wandσ-polarization laser at 1066.7nm with output power of 4.4 W are obtained for the ~4F_(3/2)-~4I_(11/2) energy level transition,respectively.While for the ~4F_(3/2)-~4I_(13/2) energy level transition,π-polarization laser at 1341.8nm with output power of 2.9 Wandσ-polarization laser at 1341.8nm with output power of 1.6 Ware obtained,respectively.The experimental results show that theπ-polarization laser has higher conversion efficiency and theσ-polarization laser owns longer laser spectrum for a-cut Nd:YVO_4 crystal.
引文
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[2]Duan Y M,Zhu H Y,Ye Y L,et al.Efficient RTP-based OPO intracavity pumped by an acousto-optic Q-switched Nd:YVO4laser[J].Optics Letters,2014,39(5):1314-1317.
[3]Dai Rong,Hu Miao,Cai Meiling,et al.Experimental study of thermally induced frequency difference tuning of Nd:YVO4 microchip dual frequency lasers[J].Chinese J Lasers,2017,44(1):0101003.戴荣,胡淼,蔡美伶,等.Nd:YVO4双频微片激光器的热致频差调谐实验研究[J].中国激光,2017,44(1):0101003.
[4]Yao Jianquan,Xu Degang.All solid state laser and nonlinear optical frequency conversion technology[M].Beijing:Science Press,2007:58-62.姚建铨,徐德刚.全固态激光及非线性光学频率变换技术[M].北京:科学出版社,2007:58-62.
[5]Wang X Z,Wang Z F,Bu Y K,et al.A 1064nm,1085nm dual-wavelength Nd:YVO4laser using Fabry-Perot filters as output couplers[J].IEEE Photonics Technology Letters,2014,26(19):1983-1985.
[6]Chen Y F,Efficient subnanosecond diode-pumped passively Q-switched Nd:YVO4 self-stimulated Raman laser[J].Optics Letters,2004,29(11):1251-1253.
[7]Yu H H,Liu J H,Zhang H J,et al.Advances in vanadate laser crystals at a lasing wavelength of 1micrometer[J].Laser&Photonics Reviews,2014,8(6):847-864.
[8]Wang Changqing,Chow Y T,Meng Xianlin,et al.Fluorescence spectra and laser characteristics of Nd:YVO4crystal excited by the polarized emission from a laser diode[J].Chinese J Lasers,1998,25(12):1129-1132.王长青,Chow Y T,孟宪林,等.Nd:YVO4晶体的偏振激发荧光光谱及其LD泵浦激光特性[J].中国激光,1998,25(12):1129-1132.
[9]Wu B,Jiang P,Yang D Z,et al.Compact dual-wavelength Nd:GdVO4laser working at 1063and 1065nm[J].Optics Express,2009,17(8):6004-6009.
[10]LüY F,Xia J,Fu X H,et al.Diode-pumped orthogonally polarized Nd:LuVO4 lasers based on the 4F3/2-4I11/2transition[J].Journal of the Optical Society of America B,2014,31(4):898-903.
[11]Ouyang Xiaojun,Wei Yong,Zhang Ge,et al.Single wavelength 1339nm Nd:YAP pulse laser[J].Infrared and Laser Engineering,2009,38(1):50-53.欧阳小军,魏勇,张戈,等.1339nm单一谱线Nd:YAP脉冲激光器[J].红外与激光工程,2009,38(1):50-53.
[12]Duan Y M,Liao X Q,Xu C W,et al.Selection ofπ-andσ-polarization laser emission in Nd:Lu0.5Y0.5VO4 mixed crystal[J].Mater Lett,2016,183:23-25.