The changes in the optical properties of water and hexane under femtosecond irradiation (Ti : Al₂O₃ laser, wavelength 800 nm, intensity ∼10¹³ W cm⁻²) are investigated in the cavitation (bubble-formation) regime using interference microscopy in a time interval of ∼1.5 ns since the impact onset. A comparison of the dynamics of radiation-induced processes (solvation of excess electrons, pair recombination, and development of precavitation processes) is performed. The excited-carrier concentration is estimated, and these estimates are found to be inconsistent with the amount of energy that must be transferred to the liquid during a pulse to implement its heating and subsequent cavitation. This inconsistency is especially pronounced for hexane, where ionisation processes can barely be detected by interferometry. The experimental results put new questions about the mechanisms of energy transfer in both polar and nonpolar liquids subjected to intense laser irradiation.

飞秒照射下水和己烷的光学性质变化（Ti : Al ₂ O ₃激光，波长800 nm，强度∼10 ¹³ W cm ^-2）在空化（气泡形成）状态下使用干涉显微镜在撞击开始后约 1.5 ns 的时间间隔内进行研究。对辐射诱导过程（过量电子的溶剂化、对复合和预空化过程的发展）的动力学进行了比较。估计了激发载流子浓度，并且发现这些估计与在脉冲期间必须转移到液体以实现其加热和随后的空化的能量的量不一致。这种不一致性在己烷中尤为明显，因为干涉法几乎无法检测到电离过程。实验结果对受到强激光照射的极性和非极性液体的能量转移机制提出了新的问题。