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.
作者
蒋广通
张亮亮
吴同
张存林
Jiang Guangtong;Zhang Liangliang;Wu Tong;Zhang Cunlin(Key Laboratory of Terahertz Optoelectronics,Ministry of Education,Beijing Key Laboratory for Terahertz Spectroscopy and Imaging,and Beijing Advanced Innovation Center for Imaging Technology,Department of Physics,Capital Normal University,Beijing 100048,China;Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology,School of Optoelectronics,Beijing Institute of Technology,Beijing 100081,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2019年第6期251-259,共9页
Chinese Journal of Lasers
基金
国家自然科学基金(61875140)
北京自然科学基金(JQ18015,4181001)
首都师范大学2018年度研究生学术创新立项(008185508200)
