The supercontinuum (SC) is generally assumed to inherit the polarization of the incident pulse in isotropic media. In this study, we experimentally investigated the polarization properties of SC spectra induced by different polarized femtosecond lasers in water. The results show that the extent of depolarization of the SC induced by a quasicircularly polarized pulse is more pronounced than that of a quasilinearly polarized pulse. In terms of the different spectral components, the long-wavelength components experienced more depolarization, and the short-wavelength components tended to be linearly polarized for both polarized input femtosecond lasers. The depolarization mechanism can be attributed to two factors, namely, the energy coupling between the two polarized components of the input femtosecond pulse, and the various degrees of nonlinear birefringence experienced by different spectral components of the SC during propagation.

中文翻译：

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线偏振和圆偏振飞秒激光脉冲在水中引起的超连续谱去偏振

通常假设超连续谱 (SC) 继承了各向同性介质中入射脉冲的极化。在这项研究中，我们通过实验研究了水中不同偏振飞秒激光诱导的 SC 光谱的偏振特性。结果表明，准圆极化脉冲引起的SC去极化程度比准线性极化脉冲更明显。就不同的光谱成分而言，对于两种偏振输入飞秒激光器，长波长成分经历了更多的去偏振，而短波长成分倾向于线性偏振。去极化机制可归因于两个因素，即输入飞秒脉冲的两个极化分量之间的能量耦合，