金属波导连续光泵气体太赫兹激光器
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摘要
针对紧凑型光泵气体太赫兹激光器(OPTL)技术,设计并研制了全金属波导结构的气体太赫兹(THz)激光器原理样机.THz激光器工作介质为CH_3OH气体,最佳工作气压30 Pa,在波长9.69μm、连续功率44 W的9P(36)支CO_2激光泵浦下,实验测得在2.52 THz频点输出功率150 m W,光子转换效率为8.4%.研究THz激光输出功率与CH_3OH工作气压、泵浦光功率的关系、以及THz激光输出稳定性,并通过压电陶瓷对THz激光腔长进行精密调节,同时测量输出功率的变化情况,讨论了金属波导THz激光器的纵模特性.实验工作与结果为下一步紧凑型折叠波导腔全金属OPTL的研制提供了参考.
A prototype of optically-pumped terahertz( THz) gas laser( OPTL) with metallic waveguide was designed and manufactured. The output power of THz laser radiation is 150 m W,pumping by a 44 W,9P36(9. 69 μm) cwCO_2 laser. The THz laser medium is CH_3OH vapour,and the pressure is 30 Pa. The photon conversion efficiency is 8. 4%. The relationships of THz laser power versus working gas pressure and pump power are given. The stability of the output power in ten minutes was measured. The variation of THz laser power was measured by adjusting the length of the THz laser cavity precisely through a piezoelectric translator. The characteristics of the longitudinal modes in the metallic waveguide THz laser are discussed. The experimental work and results are helpful for further researches on the compact folded all-metal waveguide OPTL.
A prototype of optically-pumped terahertz( THz) gas laser( OPTL) with metallic waveguide was designed and manufactured. The output power of THz laser radiation is 150 m W,pumping by a 44 W,9P36(9. 69 μm) cwCO_2 laser. The THz laser medium is CH_3OH vapour,and the pressure is 30 Pa. The photon conversion efficiency is 8. 4%. The relationships of THz laser power versus working gas pressure and pump power are given. The stability of the output power in ten minutes was measured. The variation of THz laser power was measured by adjusting the length of the THz laser cavity precisely through a piezoelectric translator. The characteristics of the longitudinal modes in the metallic waveguide THz laser are discussed. The experimental work and results are helpful for further researches on the compact folded all-metal waveguide OPTL.
引文
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[14]TIAN Zhao-shuo,WANG Jing,FEI Fei,et al.Study of optically pumped all-metal terahertz laser[J].Chinese J.Laser(田兆硕,王静,费非,等.光抽运全金属太赫兹激光器研究.中国激光),2010,37(9):2323-2327.
[15]GUO Xiao-yang,LI Ting,WANG Du,et al.Influence of frequency shift of pump laser on photoacoustic signal for frequency stabilization[J].Infared and Laser Engineering(郭晓阳,李婷,王度,等.泵浦激光频率漂移对光声稳频信号的影响.红外与激光工程),2015,44(6):1746-1751.
[16]KONG Wei-peng,WANG Du,GUO Chao,et al.A theoretical investigation and experiment of hybrid metal-mesh output coupler[J].J.Infrared Millim.Waves(孔维鹏,王度,郭超,等.复合型金属网栅耦合输出镜.红外与毫米波学报),2015,34(5):587-592.
[17]Stellan Jacobsson.Optically pumped far infrared lasers[J].Infrared Phys.1989,(29)5:853-874.
[18]Hodges D T,Hartwick T S.Waveguide laser for the far infrared(FIR)pumped by a CO2laser[J].Appl.Phys.Lett.,1973,23(5):252-253.
[2]FU Shi-you,TIAN Zhao-shuo,YI Fu-long,et al.Development and prospect for optically pumped THz laser[J].J.Harbin Institute of Technology(付石友,田兆硕,衣福龙,等.光泵THz激光器进展及其应用前景.哈尔滨工业大学学报),2008,40(3):435-439.
[3]Davies A G,Burmett A D,Fan W,et al.Terahertz spectroscopy of explosives and drugs[J].Material Today,2008,11(3):18-26.
[4]Jam Farhoomand,Herbert M.Pickett.Stable 1.25 watts cw far infrared laser radiation at the 119μm methanol line[J].Int.J.Infrared and Millimeter waves,1987,8(5):441-447.
[5]Nakayama K,Tazawa H,Okajima S,et al.High-power 47.6 and 57.2μm CH3OD lasers pumped by continuous-wave9R(8)CO2laser[J].Rev.Sci.Instrum,2004,75(2):329-322.
[6]Mueller E R,Henschke R,Robotham W E.Terahertz local oscillator for t he microwave limb sounder on the aura satellite[J].Appl.Opt,2007,46(22):4907-4915.
[7]QIN J Y,HUANG X,LUO X Z,et al.Spectral characteristics comparison of pulsed optically pumped NH3and CH3OHfar-infrared laser[J].Int.J.Infrared Millimeter Waves,1999,20(8):1515-1524.
[8]ZHANG Ping,ZHANG Xun,HUANG Xiao,et al.The study of two longitudinal mode optically pumped super radiant THz laser and cavity THz laser[J].J.Optoelectronics·Laser(张萍,张迅,黄晓,等.双纵模光泵超辐射式和腔式THz激光器的研究.光电子·激光),2002,13(4):332-335.
[9]BAO Yan-xian,HUANG Xiao,LUO Xi-zhang.Choice of three-energy-level groups on optically pumped sub-millimeter wave laser medium[J].J.Optoelectronics·Laser(保延翔,黄晓,罗锡璋.参与光泵亚毫米波激光过程的介质三能级组的选取.光电子·激光),2004,15(11):1320-1323.
[10]QI Chun-chao,ZUO Du-Luo,LU Yan-zhao,et al.An efficient photon conversion efficiency ammonia terahertz cavity laser[J].Chin.Phys.Lett.,2009,26(12):124201.
[11]HE Zhi-zhong,YAO Jian-quan,SHI Hua-feng,et al.Semiclassical theory of optically pumped D2O gas tera-Hz laser[J].Acta Physica S inica(何志红,姚建铨,时华锋,等.光泵重水气体产生THz激光的半经典理论分析.物理学报),2007,56(7):5802-5807.
[12]Rolf Güstena,Paul Hartoghd,Heinz-Wilhelm Hübers,et al.GREAT:The German first light heterodyne instrumentation for SOFIA.Infrared Spaceborne Remote Sensing and Instrumentation XV,San Diego,CA,2007[C].
[13]Mueller E R.Optically pumped THz laser tech-nology[J/OL].http://www.coherent.com/downloads/Optically Pumped Laser.pdf.
[14]TIAN Zhao-shuo,WANG Jing,FEI Fei,et al.Study of optically pumped all-metal terahertz laser[J].Chinese J.Laser(田兆硕,王静,费非,等.光抽运全金属太赫兹激光器研究.中国激光),2010,37(9):2323-2327.
[15]GUO Xiao-yang,LI Ting,WANG Du,et al.Influence of frequency shift of pump laser on photoacoustic signal for frequency stabilization[J].Infared and Laser Engineering(郭晓阳,李婷,王度,等.泵浦激光频率漂移对光声稳频信号的影响.红外与激光工程),2015,44(6):1746-1751.
[16]KONG Wei-peng,WANG Du,GUO Chao,et al.A theoretical investigation and experiment of hybrid metal-mesh output coupler[J].J.Infrared Millim.Waves(孔维鹏,王度,郭超,等.复合型金属网栅耦合输出镜.红外与毫米波学报),2015,34(5):587-592.
[17]Stellan Jacobsson.Optically pumped far infrared lasers[J].Infrared Phys.1989,(29)5:853-874.
[18]Hodges D T,Hartwick T S.Waveguide laser for the far infrared(FIR)pumped by a CO2laser[J].Appl.Phys.Lett.,1973,23(5):252-253.