离轴涡旋光束诱导空气等离子体产生太赫兹波
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摘要
使用涡旋光束代替高斯光束作为产生光源,研究了涡旋光束产生太赫兹波的过程。探究了具有不同拓扑荷数的涡旋光束在产生太赫兹波时的差异,相位奇点的位置对产生太赫兹波的影响,不同脉冲强度和激光波长下涡旋光束产生的太赫兹波能量、频谱和偏振的变化。结果表明,产生的太赫兹波强度会随涡旋光束拓扑荷数的变化而变化,并且与涡旋中心的位置密切相关。涡旋光束所产生的太赫兹波随脉冲强度和激光波长的变化趋势与高斯光束一致。高斯光束与涡旋光束产生的太赫兹波在频谱和偏振上的变化趋势一致。
This study aims to investigate the process of terahertz wave generation using a vortex beam generated by spatial light modulator rather than a Gaussian beam as the light source. Herein, we explore the differences among vortex beams with different topological charge numbers when generating terahertz waves. We find that the generation of terahertz waves is affected by the phase singularity position. In addition, we investigate the changes of terahertz wave energy, spectrum, and polarization produced by vortex beams with different pulse intensities and laser wavelengths. The results demonstrate that the intensity of the terahertz wave changes with the topological charge number, which is also closely related to the position of the vortex center. Under the same vortex beam, the variation of the generated terahertz wave with pulse intensity and laser wavelength is consistent with that for a Gaussian beam. Specifically, the terahertz waves generated by a vortex beam and a Gaussian beam are consistent in terms of spectrum and polarization.
This study aims to investigate the process of terahertz wave generation using a vortex beam generated by spatial light modulator rather than a Gaussian beam as the light source. Herein, we explore the differences among vortex beams with different topological charge numbers when generating terahertz waves. We find that the generation of terahertz waves is affected by the phase singularity position. In addition, we investigate the changes of terahertz wave energy, spectrum, and polarization produced by vortex beams with different pulse intensities and laser wavelengths. The results demonstrate that the intensity of the terahertz wave changes with the topological charge number, which is also closely related to the position of the vortex center. Under the same vortex beam, the variation of the generated terahertz wave with pulse intensity and laser wavelength is consistent with that for a Gaussian beam. Specifically, the terahertz waves generated by a vortex beam and a Gaussian beam are consistent in terms of spectrum and polarization.
引文
[1] Hamster H,Sullivan A,Gordon S,et al.Subpicosecond,electromagnetic pulses from intense laser-plasma interaction[J].Physical Review Letters,1993,71(17):2725-2728.
[2] Hamster H,Sullivan A,Gordon S,et al.Short-pulse terahertz radiation from high-intensity-laser-produced plasmas[J].Physical Review E,1994,49(1):671-677.
[3] Cook D J,Hochstrasser R M.Intense terahertz pulses by four-wave rectification in air[J].Optics Letters,2000,25(16):1210-1212.
[4] Kress M,L?ffler T,Eden S,et al.Terahertz-pulse generation by photoionization of air with laser pulses composed of both fundamental and second-harmonic waves[J].Optics Letters,2004,29(10):1120-1122.
[5] Kre? M,L?ffler T,Thomson M D,et al.Determination of the carrier-envelope phase of few-cycle laser pulses with terahertz-emission spectroscopy[J].Nature Physics,2006,2(5):327-331.
[6] Kim K Y,Glownia J H,Taylor A J,et al.Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields[J].Optics Express,2007,15(8):4577-4584.
[7] D′Amico C,Houard A,Franco M,et al.Conical forward THz emission from femtosecond-laser-beam filamentation in air[J].Physical Review Letters,2007,98(23):235002.
[8] Chen Y Q,Yamaguchi M,Wang M F,et al.Terahertz pulse generation from noble gases[J].Applied Physics Letters,2007,91(25):251116.
[9] Sun X,Zhang X C.Terahertz radiation in alkali vapor plasmas[J].Applied Physics Letters,2014,104(19):191106.
[10] Zhang S J,Zhang L L,Zhao H,et al.Excitation-wavelength scaling of terahertz radiation in alkali vapor plasmas[J].Applied Physics Letters,2017,111(11):111104.
[11] Clerici M,Peccianti M,Schmidt B E,et al.Wavelength scaling of terahertz generation by gas ionization[J].Physical Review Letters,2013,110(25):253901.
[12] Liu K,Koulouklidis A D,Papazoglou D G,et al.Enhanced terahertz wave emission from air-plasma tailored by abruptly autofocusing laser beams[J].Optica,2016,3(6):605-608.
[13] Zeng X.Theoretical and technique research of lensless optical correlator based on LCOS SLM[D].Hangzhou:Zhejiang University,2012:74-76.曾旭.基于LCOS空间光调制器的无透镜光学相关器的理论与技术研究[D].杭州:浙江大学,2012:74-76.
[14] Dai M C,Fan D H,Wang Y,et al.Generation of high quality helical beams based on spatial light modulator[J].Chinese Journal of Lasers,2016,43(9):0905004.戴茂春,樊代和,王尧,等.基于空间光调制器的高质量螺旋光束制备[J].中国激光,2016,43(9):0905004.
[15] Nye J F,Berry M V.Dislocations in wave trains[J].Proceedings of the Royal Series A,1974,336:165-190.
[16] Coullet P,Gil L,Rocca F.Optical vortices[J].Optics Communications,1989,73:403-408.
[17] Chen Z Y.Propagation and focusing properties of vortex beams[D].Hangzhou:Zhejiang University,2014:27-39.陈子阳.涡旋光束的传输与聚焦特性[D].杭州:浙江大学,2014:27-39.
[18] Curtis J E,Koss B A,Grier D G.Dynamic holographic optical tweezers[J].Optics Communications,2002,207:169-175.
[19] Basistiy I V,Slyusar V V,Soskin M S,et al.Manifestation of the rotational Doppler effect by use of an off-axis optical vortex beam[J].Optics Letters,2003,28(14):1185-1187.
[20] Lu Q,Sheng L,Zhang X,et al.Investigation on pure phase modulation characteristics of liquid crystal spatial light modulator at oblique incidence[J].Chinese Journal of Lasers,2016,43(1):0112001.鲁强,盛磊,张鑫,等.斜入射下液晶空间光调制器纯相位调制特性研究[J].中国激光,2016,43(1):0112001.
[21] Xu S Q,Zhang Y Z,Liu W W,et al.Experimental confirmation of high-stability of fluorescence in a femtosecond laser filament in air[J].Optics Communications,2009,282(24):4800-4804.
[22] Perelomov A M,Popov V S,Terent M V.Ionization of atoms in an alternating electric field[J].Soviet Physics Jetp,1966,23(5):924-934.
[23] Zhang Y Z,Chen Y P,Xu S Q,et al.Portraying polarization state of terahertz pulse generated by a two-color laser field in air[J].Optics Letters,2009,34(18):2841-2843.
[2] Hamster H,Sullivan A,Gordon S,et al.Short-pulse terahertz radiation from high-intensity-laser-produced plasmas[J].Physical Review E,1994,49(1):671-677.
[3] Cook D J,Hochstrasser R M.Intense terahertz pulses by four-wave rectification in air[J].Optics Letters,2000,25(16):1210-1212.
[4] Kress M,L?ffler T,Eden S,et al.Terahertz-pulse generation by photoionization of air with laser pulses composed of both fundamental and second-harmonic waves[J].Optics Letters,2004,29(10):1120-1122.
[5] Kre? M,L?ffler T,Thomson M D,et al.Determination of the carrier-envelope phase of few-cycle laser pulses with terahertz-emission spectroscopy[J].Nature Physics,2006,2(5):327-331.
[6] Kim K Y,Glownia J H,Taylor A J,et al.Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields[J].Optics Express,2007,15(8):4577-4584.
[7] D′Amico C,Houard A,Franco M,et al.Conical forward THz emission from femtosecond-laser-beam filamentation in air[J].Physical Review Letters,2007,98(23):235002.
[8] Chen Y Q,Yamaguchi M,Wang M F,et al.Terahertz pulse generation from noble gases[J].Applied Physics Letters,2007,91(25):251116.
[9] Sun X,Zhang X C.Terahertz radiation in alkali vapor plasmas[J].Applied Physics Letters,2014,104(19):191106.
[10] Zhang S J,Zhang L L,Zhao H,et al.Excitation-wavelength scaling of terahertz radiation in alkali vapor plasmas[J].Applied Physics Letters,2017,111(11):111104.
[11] Clerici M,Peccianti M,Schmidt B E,et al.Wavelength scaling of terahertz generation by gas ionization[J].Physical Review Letters,2013,110(25):253901.
[12] Liu K,Koulouklidis A D,Papazoglou D G,et al.Enhanced terahertz wave emission from air-plasma tailored by abruptly autofocusing laser beams[J].Optica,2016,3(6):605-608.
[13] Zeng X.Theoretical and technique research of lensless optical correlator based on LCOS SLM[D].Hangzhou:Zhejiang University,2012:74-76.曾旭.基于LCOS空间光调制器的无透镜光学相关器的理论与技术研究[D].杭州:浙江大学,2012:74-76.
[14] Dai M C,Fan D H,Wang Y,et al.Generation of high quality helical beams based on spatial light modulator[J].Chinese Journal of Lasers,2016,43(9):0905004.戴茂春,樊代和,王尧,等.基于空间光调制器的高质量螺旋光束制备[J].中国激光,2016,43(9):0905004.
[15] Nye J F,Berry M V.Dislocations in wave trains[J].Proceedings of the Royal Series A,1974,336:165-190.
[16] Coullet P,Gil L,Rocca F.Optical vortices[J].Optics Communications,1989,73:403-408.
[17] Chen Z Y.Propagation and focusing properties of vortex beams[D].Hangzhou:Zhejiang University,2014:27-39.陈子阳.涡旋光束的传输与聚焦特性[D].杭州:浙江大学,2014:27-39.
[18] Curtis J E,Koss B A,Grier D G.Dynamic holographic optical tweezers[J].Optics Communications,2002,207:169-175.
[19] Basistiy I V,Slyusar V V,Soskin M S,et al.Manifestation of the rotational Doppler effect by use of an off-axis optical vortex beam[J].Optics Letters,2003,28(14):1185-1187.
[20] Lu Q,Sheng L,Zhang X,et al.Investigation on pure phase modulation characteristics of liquid crystal spatial light modulator at oblique incidence[J].Chinese Journal of Lasers,2016,43(1):0112001.鲁强,盛磊,张鑫,等.斜入射下液晶空间光调制器纯相位调制特性研究[J].中国激光,2016,43(1):0112001.
[21] Xu S Q,Zhang Y Z,Liu W W,et al.Experimental confirmation of high-stability of fluorescence in a femtosecond laser filament in air[J].Optics Communications,2009,282(24):4800-4804.
[22] Perelomov A M,Popov V S,Terent M V.Ionization of atoms in an alternating electric field[J].Soviet Physics Jetp,1966,23(5):924-934.
[23] Zhang Y Z,Chen Y P,Xu S Q,et al.Portraying polarization state of terahertz pulse generated by a two-color laser field in air[J].Optics Letters,2009,34(18):2841-2843.
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