大能量磷酸钛氧钾太赫兹参量源
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摘要
使用磷酸钛氧钾(KTiOPO_4,KTP)晶体,采用斯托克斯参量振荡器与太赫兹波表面垂直出射的斯托克斯参量放大器相结合的实验方案,获得了大能量的太赫兹波输出。抽运源是调Q脉冲激光器,输出波长为1064.2 nm,脉宽为7.5 ns,脉冲重复频率为1 Hz。斯托克斯光波长为1086.2 nm,抽运光与斯托克斯光的夹角为4.4°,太赫兹波频率为5.7 THz。抽运光路上的延时装置可以保证抽运光脉冲与待放大斯托克斯光脉冲有很好的时间重合性。当抽运光脉冲能量为770 mJ、待放大斯托克斯光脉冲能量为16.8 mJ时,放大后斯托克斯光脉冲能量为185.4 mJ,太赫兹波脉冲能量最大为6.4μJ。
In this study, the high-energy terahertz-wave pulses were generated using a potassium titanyl phosphate(KTiOPO_4, KTP)crystal and an experimental scheme that combines a Stokes parametric oscillator and a Stokes parametric amplifier involving the vertical surface emission of terahertz waves. The pump source was a Q-switched laser with an output wavelength of 1064.2 nm, a pulse width of 7.5 ns, and a pulse repetition rate of 1 Hz. The Stokes light wavelength is 1086.2 nm, the angle between the pump and Stokes beams is 4.4°, and the terahertz wave frequency is 5.7 THz. The time-delay device on the pump-light path can ensure that the pump light pulse has a good time coincidence with the Stokes light pulse to be amplified. When the pump light pulse energy is 770 mJ and the Stokes light pulse energy to be amplified is 16.8 mJ, the amplified Stokes light pulse energy is 185.4 mJ and the maximum terahertz wave pulse energy is 6.4 μJ.
In this study, the high-energy terahertz-wave pulses were generated using a potassium titanyl phosphate(KTiOPO_4, KTP)crystal and an experimental scheme that combines a Stokes parametric oscillator and a Stokes parametric amplifier involving the vertical surface emission of terahertz waves. The pump source was a Q-switched laser with an output wavelength of 1064.2 nm, a pulse width of 7.5 ns, and a pulse repetition rate of 1 Hz. The Stokes light wavelength is 1086.2 nm, the angle between the pump and Stokes beams is 4.4°, and the terahertz wave frequency is 5.7 THz. The time-delay device on the pump-light path can ensure that the pump light pulse has a good time coincidence with the Stokes light pulse to be amplified. When the pump light pulse energy is 770 mJ and the Stokes light pulse energy to be amplified is 16.8 mJ, the amplified Stokes light pulse energy is 185.4 mJ and the maximum terahertz wave pulse energy is 6.4 μJ.
引文
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[2] Li W J,Wang T Y,Zhou Y,et al.Terahertz non-destructive inspection of air defect within adhesive layers of multi-layer bonded structure[J].Acta Optica Sinica,2017,37(1):0111002.李文军,王天一,周宇,等.多层胶接结构胶层空气缺陷的太赫兹无损检测[J].光学学报,2017,37(1):0111002.
[3] Zhang W T,Wang S Y,Zhan P P,et al.Method of identifying red wood based on terahertz time-domain spectroscopy[J].Acta Optica Sinica,2017,37(2):0230006.张文涛,王思远,占平平,等.基于太赫兹时域光谱技术的红木检测方法[J].光学学报,2017,37(2):0230006.
[4] Li M Q,Tan Z Y,Qiu F C,et al.Fast reflective scanning imaging based on terahertz quantum-cascade laser[J].Acta Optica Sinica,2017,37(6):0611004.李孟奇,谭智勇,邱付成,等.基于太赫兹量子级联激光器的反射式快速扫描成像[J].光学学报,2017,37(6):0611004.
[5] Li N,Bai Y,Liu P.Ellipticity characteristic of terahertz radiation source generated from vacuum jet target[J].Acta Optica Sinica,2017,37(3):0326002.李娜,白亚,刘鹏.真空喷气靶太赫兹辐射源椭圆度特性[J].光学学报,2017,37(3):0326002.
[6] Sun B,Yao J Q.Generation of terahertz wave based on optical methods[J].Chinese Journal of Lasers,2006,33(10):1349-1359.孙博,姚建铨.基于光学方法的太赫兹辐射源[J].中国激光,2006,33(10):1349-1359.
[7] Tang G Q,Cong Z H,Qin Z G,et al.Energy scaling of terahertz-wave parametric sources[J].Optics Express,2015,23(4):4144-4152.
[8] Hayashi S,Nawata K,Taira T,et al.Ultrabright continuously tunable terahertz-wave generation at room temperature[J].Scientific Reports,2015,4(5):5045-5049.
[9] Zhang R L,Qu Y C,Zhao W J,et al.Si-prism-array coupled terahertz-wave parametric oscillator with pump light totally reflected at the terahertz-wave exit surface[J].Optics Letters,2016,41(17):4016-4018.
[10] Kawase K,Shikata J I,Imai K,et al.Transform-limited,narrow-linewidth,terahertz-wave parametric generator[J].Applied Physics Letters,2001,78(19):2819-2821.
[11] Li Y,Zhang X Y,Cong Z H,et al.Injection-seeded terahertz parametric oscillator based on ring-cavity configuration[J].Chinese Journal of Lasers,2017,44(10):1014001.李圆,张行愚,丛振华,等.基于环形腔结构的种子注入式太赫兹参量振荡器[J].中国激光,2017,44(10):1014001.
[12] Yang Z,Wang Y Y,Xu D G,et al.High-energy terahertz wave parametric oscillator with a surface-emitted ring-cavity configuration[J].Optics Letters,2016,41(10):2262-2264.
[13] Sun B,Li S X,Liu J S,et al.Terahertz-wave parametric oscillator with a misalignment-resistant tuning cavity[J].Optics Letters,2011,36(10):1845-1847.
[14] Kawase K,Shikata J I,Minamide H,et al.Arrayed silicon prism coupler for a terahertz-wave parametric oscillator[J].Applied Optics,2001,40(9):1423-1424.
[15] Imai K,Kawase K,Minamide H,et al.Achromatically injection-seeded terahertz-wave parametric generator[J].Optics Letters,2002,27(24):2173-2175.
[16] Wang W T,Cong Z H,Chen X H,et al.Terahertz parametric oscillator based on KTiOPO4 crystal[J].Optics Letters,2014,39(13):3706-3708.
[17] Yan C,Wang Y Y,Xu D G,et al.Green laser induced terahertz tuning range expanding in KTiOPO4 terahertz parametric oscillator[J].Applied Physics Letters,2016,108(1):011107.
[18] Li Z Y,Bing P B,Yuan S.Theoretical analysis of terahertz parametric oscillator using KTiOPO4 crystal[J].Optics & Laser Technology,2016,82(4):108-112.
[19] Wu M H,Chiu Y C,Wang T D,et al.Terahertz parametric generation and amplification from potassium titanyl phosphate in comparison with lithium niobate and lithium tantalate[J].Optics Express,2016,24(23):25964-25973.
[20] Wang W T,Cong Z H,Liu Z J,et al.THz-wave generation via stimulated polariton scattering in KTiOAsO4 crystal[J].Optics Express,2014,22(14):17092-17098.
[21] Ortega T A,Pask H M,Spence D J,et al.Stimulated polariton scattering in an intracavity RbTiOPO4 crystal generating frequency-tunable THz output[J].Optics Express,2016,24(10):10254-10264.
[22] Ortega T A,Pask H M,Spence D J,et al.Tunable 3-6 THz polariton laser exceeding 0.1 mW average output power based on crystalline RbTiOPO4[J].IEEE Journal of Selected Topics in Quantum Electronics,2018,24(5):1-6.
[23] Gao F L,Zhang X Y,Cong Z H,et al.Terahertz parametric oscillator with the surface-emitted configuration in RbTiOPO4 crystal[J].Optics & Laser Technology,2018,104(10):37-42.
[24] Wang W T,Zhang X Y,Wang Q P,et al.Multiple-beam output of a surface-emitted terahertz-wave parametric oscillator by using a slab MgO\:LiNbO3 crystal[J].Optics Letters,2014,39(4):754-757.
[25] Ikari T,Zhang X B,Minamide H,et al.THz-wave parametric oscillator with a surface-emitted configuration[J].Optics Express,2006,14(4):1604-1610.
[26] Ikari T,Minamide H,Ito H.Energy scalable and high beam quality THz-wave parametricoscillator using surface emitted cavity configuration[C]//2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics,September 18-22,2006,Shanghai,China.New York:IEEE,2006:333-333.