Zhang Yun, Xia Yu, Liang Canneng, Xiong Yuyao, Zhang Jingyuan, Lin Shuang, Li Suyu, Jin Mingxing
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China.
Sensors (Basel). 2025 Apr 4;25(7):2285. doi: 10.3390/s25072285.
In this work, we experimentally investigate the characteristics of supercontinuum (SC) generation induced by femtosecond laser pulses with different polarization states in transparent medium. We employ a Mach-Zehnder Interferometer (MZI) to capture interference patterns during the filamentation process. The relative filamentation threshold, , is measured for femtosecond laser pulses with different polarization states. The results demonstrate that the intensity of SC is strongly correlated with the polarization state of the incident laser pulses. At the same pulse energy, circularly polarized (CP) pulses suppress SC generation compared to linearly polarized (LP) pulses. Compared with weak external focusing, short-focal-length focusing significantly broadens the spectral range of SC. As the focal length of the focusing lens increases, the measured values also increase. The of the CP pulses is consistently higher than that of LP pulses. The experimental measurements of for femtosecond lasers with different polarization states provide basic data support for the research on nonlinear characteristics.
在这项工作中，我们通过实验研究了透明介质中不同偏振态的飞秒激光脉冲诱导产生超连续谱（SC）的特性。我们采用马赫-曾德尔干涉仪（MZI）来捕捉丝状化过程中的干涉图样。测量了不同偏振态飞秒激光脉冲的相对丝状化阈值。结果表明，超连续谱的强度与入射激光脉冲的偏振态密切相关。在相同脉冲能量下，与线偏振（LP）脉冲相比，圆偏振（CP）脉冲抑制了超连续谱的产生。与弱外部聚焦相比，短焦距聚焦显著拓宽了超连续谱的光谱范围。随着聚焦透镜焦距的增加，测量得到的 值也增加。圆偏振脉冲的 始终高于线偏振脉冲。对不同偏振态飞秒激光的 进行实验测量，为非线性特性研究提供了基础数据支持。
