三镜直腔结构MgO∶PPLN高效连续光参量振荡器
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摘要
为了优化MgO∶PPLN连续光参量振荡器(OPO)的输出特性,对三镜直腔结构的内腔式OPO系统进行腔结构设计,对其同时输出高效的信号光和闲频光进行研究。采用半导体激光端面抽运Nd∶YVO4晶体实现连续的1 064nm激光为基频光。对比分析了基频激光腔和OPO腔各腔镜分别采用平面镜或平凹镜的三种腔型结构的激光输出特性。基于30.5μm的极化周期和12.4W入射抽运功率时,获得了最高输出功率3.92W(信号光2.6W和闲频光1.32W),转化效率31.6%的激光输出,对应的信号光和闲频光的中心波长分别为1 549nm和3 394nm。结果表明三个腔镜均采用平凹镜时,可有效的压缩基频激光腔在MgO∶PPLN晶体上的光斑,提升基频激光的功率密度,而且基频激光腔和OPO腔的基模光斑在MgO∶PPLN晶体上更好的匹配,从而提升变频效率。
In order to optimize the output characteristics of continuous-wave singly resonant MgO∶PPLN optical parametric oscillations(OPO),a compact three-mirror linear cavity structure was designed for efficient signal light and idler light outputs.A diode laser end-pumped Nd∶YVO4 crystal laser at 1 064 nm was used as the fundamental laser source to derive the OPO in the cavity.Three laser cavities with cavity mirrors chosen from plane mirror or plano-concave mirror were designed for comparison.The simulation results show that the fundamental laser beam could be compressed,and the power density could be improved on the MgO∶PPLN crystal if all three cavity mirrors used the plano-concave mirror(named concave-concave-concave cavity in this paper).The frequency conversion efficiency would be improved for better mode matching between the fundamental cavity and the OPOcavity with the concave-concave-concave cavity.A total output power of 3.92 Wand conversion efficiency of 31.6% were obtained at the incident pump power of 12.4 Wand grating period of 30.5μm.A 2.6 Wlight signal with the center wavelength at 1 549 nm and 1.32 Widler light with center wavelength at 3 394 nm were achieved.
In order to optimize the output characteristics of continuous-wave singly resonant MgO∶PPLN optical parametric oscillations(OPO),a compact three-mirror linear cavity structure was designed for efficient signal light and idler light outputs.A diode laser end-pumped Nd∶YVO4 crystal laser at 1 064 nm was used as the fundamental laser source to derive the OPO in the cavity.Three laser cavities with cavity mirrors chosen from plane mirror or plano-concave mirror were designed for comparison.The simulation results show that the fundamental laser beam could be compressed,and the power density could be improved on the MgO∶PPLN crystal if all three cavity mirrors used the plano-concave mirror(named concave-concave-concave cavity in this paper).The frequency conversion efficiency would be improved for better mode matching between the fundamental cavity and the OPOcavity with the concave-concave-concave cavity.A total output power of 3.92 Wand conversion efficiency of 31.6% were obtained at the incident pump power of 12.4 Wand grating period of 30.5μm.A 2.6 Wlight signal with the center wavelength at 1 549 nm and 1.32 Widler light with center wavelength at 3 394 nm were achieved.
引文
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[18]于永吉,陈薪羽,成丽波,等.基于MgO∶APLN的1.57μm/3.84μm连续波内腔多光参量振荡器研究[J].物理学报,2015,64(22):0224215.YU Y J,CHEN X Y,CHENG L B,et al..Continuous-wave 1.57μm/3.84μm intra-cavity multiple optical parametric oscillator based on MgO∶APLN[J].Acta Physica Sinica,2015,64(22):0224215.(in Chinese)
[19]邢爽,于永吉,王宇恒,等.基于多周期MgO:PPLN的内腔宽调谐连续中红外光参量振荡器[J].光子学报,2018,47(6):0619002.XING SH,YU Y J,WANG Y H,et al..Wide tunable contunuous-wave mid infrared intro-cavity optica parametric oscillator based on multi-period MgO∶PPLN[J].Acta Photonica Sinica,2018,47(6):0619002.(in Chinese)
[20] ZHANG J,ZHANG Y C,DUAN Y M,et al..Mid-infrared tunable intracavity singly resonant optical parametric oscillator based on MgO∶PPLN[J].International Journal of Optics,2017,2017:3610162.
[2] HAN K Z,NING J,HE J L,et al..High-efficiency mid-infrared picosecond MgO∶PPLN single resonant optical parametric oscillator[J].Chinese Physics Letter,2015,32(5):054203.
[3] KOVALCHUK E V,DEKORSY D,LVOSKY A I,et al..High-resolution Doppler-free molecular spectroscopy with a continuous-wave optical parametric oscillator[J].Optics Letter,2001,26(18):1430-1432.
[4]李充,谢冀江,潘其坤,等.中红外光学参量振荡器技术进展[J].中国光学,2016,9(6):615-624.LI CH,XIE J J,PAN Q K,et al..Progress of mid-infrared optical parametric oscillator[J].Chinese Optics,2016,9(6):615-624.(in Chinese)
[5]谢小兵,李世光,朱小磊,等.环形腔2.05μm单谐振KTP晶体光参量振荡器研究[J].光子学报,2017,46(8):0823004.XIE X B,LI SH G,ZHU X L,et al..Investigation on ring-cavity 2.05μm single resonant KTP crystal optical parametric oscillator[J].Acta Photonica Sinica,2017,46(8):0823004.(in Chinese)
[6] BOSENBERG W R,DROBSHOFF A,ALEXANDER J I,et al..Continuous-wave singly resonant optical parametric oscillator based on periodically poled LiNbO3[J].Optics Letter,1996,10:713-715.
[7]STOTHARD D J M,EBRAHIMZADEH M,DUNN M H. Low-pump-threshold contnouswave singly resonant optical parametric oscillator[J].Optics Letter,1998(23):1895-1897.
[8] TSUNEKANE M,TAQUCHI N,INABA H,et al..Continuous-wave,broadband tuning from 788to 1640nm by a doubly resonant MgO∶LiNbO3optical parametric oscillator[J].Applied Physics Letter,1998,26:3414-3416.
[9] WEI K H,JIANG P P,WU B,et al..Fiber laser pumped burst-mode operated picosecond mid-infrared laser[J].Chinese Physics B,2015,24(2):024217.
[10] MURRAY R T,RUNCORN T H,GUHA S,et al..High average power parametric wavelength conversion at 3.31-3.48μm in MgO∶PPLN[J].Optics Express,2017,25:6421-6430.
[11] LIN S,LIN Y,TU R Y,et al..3μm continuouswave singly resonant OPO in conference on lasers and electro-optics/quantum electronics and laser science conference and photonic applications systems technologies[J].OSA Technical Digest(CD)(Optical Society of America,2008),paper CTuII7.
[12] DUAN Y M,ZHU H Y,FENG Z R,et al..A compact, CW mid-infrared intra-cavity Nd∶Lu0.5Y0.5VO4/KTA-OPO at 3.5μm[J].Laser Physics Letters,2013,10(5):055803.
[13] DING X,SHENG Q,CHEN N,et al..High efficiency continuous-wave tunable signal output of an intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate[J].Chinese Physics B,2009,18(10):4314-4318.
[14]苏辉,李志平,段延敏,等.基于掺镁周期极化铌酸锂晶体的内腔单共振连续可调谐光参量振荡器[J].光学精密工程,2013,21(6):1404-1409.SU H,LI ZH P,DUAN Y M,et al..Intra-cavity singly resonant optical parametric oscillator based on magnesium-doped periodically poled lithium niobate[J].Opt.Precision Eng.,2013,21(6):1404-1409.(in Chinese)
[15]丁欣,尚策,盛泉,等.880nm共振抽运连续波内腔单谐振光学参量振荡器及其逆转换[J].中国激光,2013,40(6):0602008.DING X,SHANG C,SHENG Q,et al..Continuous-wave tunable intra-cavity single resonance optical parametric oscillator under 880 nm in-band pumping and the inverse conversion[J].Chinese Journal of Lasers,2013,40(6):0602008.(in Chinese)
[16] SHENG Q,DING X,SHI C P,et al..Continuous-wave mid-infrared intra-cavity singly resonant PPLN-OPO under 880nm in-band pumping[J].Optics Express,2012,20:8041-8046.
[17] LI Z P,DUAN Y M,WU K R,et al..Continuous-wave,widely tunable,intra-cavity singly resonant magnesium-doped periodicaly poled lithium niobate optical parametric oscillator[J].Laser Physics,2013,23:055006.
[18]于永吉,陈薪羽,成丽波,等.基于MgO∶APLN的1.57μm/3.84μm连续波内腔多光参量振荡器研究[J].物理学报,2015,64(22):0224215.YU Y J,CHEN X Y,CHENG L B,et al..Continuous-wave 1.57μm/3.84μm intra-cavity multiple optical parametric oscillator based on MgO∶APLN[J].Acta Physica Sinica,2015,64(22):0224215.(in Chinese)
[19]邢爽,于永吉,王宇恒,等.基于多周期MgO:PPLN的内腔宽调谐连续中红外光参量振荡器[J].光子学报,2018,47(6):0619002.XING SH,YU Y J,WANG Y H,et al..Wide tunable contunuous-wave mid infrared intro-cavity optica parametric oscillator based on multi-period MgO∶PPLN[J].Acta Photonica Sinica,2018,47(6):0619002.(in Chinese)
[20] ZHANG J,ZHANG Y C,DUAN Y M,et al..Mid-infrared tunable intracavity singly resonant optical parametric oscillator based on MgO∶PPLN[J].International Journal of Optics,2017,2017:3610162.