大学物理 ›› 2019, Vol. 38 ›› Issue (10): 61-.doi: 10.16854 /j.cnki.1000-0712. 180689

• 大学生园地 • 上一篇    下一篇

超短激光脉冲的空间展宽及其啁啾特性研究

曹宇祥,李沁,阎晓娜,戴晔   

  1.  上海大学物理系,上海200444
  • 收稿日期:2018-12-21 修回日期:2019-04-01 出版日期:2019-10-20 发布日期:2019-11-20
  • 通讯作者: 戴晔,E-mail: yedai@ shu.edu.cn
  • 作者简介:曹宇祥( 1996—) ,男,江苏泰州人,上海大学物理系电子信息科学与技术专业2015 级本科生.
  • 基金资助:
    国家自然科学基金( 11774220) ; 上海大学2017 年国家级大学生创新创业训练计划( SJ2017098) 和上海大学联合大作业项目" 超快激光技术及其在通信和光谱检测领域的应用" 资助

Study of spatial broadening and chirp of ultrashort laser pulses

CAO Yu-xiang,LI Qin,YAN Xiao-na,DAI Ye   

  1. Department of Physics,Shanghai University,Shanghai 200444,China
  • Received:2018-12-21 Revised:2019-04-01 Online:2019-10-20 Published:2019-11-20

摘要: 本文讨论了具有一定频谱宽度的超短激光脉冲经过一对平行光栅后的空间展宽特性. 首先应用经典的光栅方程推导了脉冲光经过光栅对后在空间上展宽的计算公式. 结果表明随着光栅对之间距离的增加,输出脉冲光斑的横轴长度会随之增加,理论结果与实验结果基本一致.最后利用光纤光谱仪逐点测量了展宽后脉冲光斑的空间光谱分布特性,验证了其空间啁啾特征的出现.

关键词: 超短激光脉冲, 光栅衍射, 空间展宽, 空间啁啾, 光谱特性

Abstract: Spatial broadening of ultrashort laser pulses with a certain spectral width is studied after passing through a pair of parallel gratings. Firstly,the formulas for calculating the spatial broadening of ultrashort laser pulses after passing through a pair of gratings are derived by using the conventional grating equation and geometric optics knowledge. The experimental results also show that with an increase of the distance between grating pair,the transverse axis length of the pulsed spot increases and fits very well with the theoretical value. Finally,the spatial spectral distribution of the broadened pulsed spot is measured point by point by a fiber spectrometer,and the result verifies appearance of the spatial chirp characteristics.

Key words: ultrashort laser pulse, grating diffraction, spatial broadening, spatial chirp, spectral characteristics