文档介绍：
Femtosecond laser induced breakdown in fused silica by
linearly, circularly, and elliptically polarized lasers#
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LI Cong, LI Xin, YUAN Yanpng, Zhang Kaihu, SHI Xuesong, Zhang Ning**
(Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute
of Technology, Beijing 100081)
Abstract: The plasma model, which has been widely used to predict the femtosecond laser induced
breakdown in fused silica, is improved to make it applicable by linearly, circularly, and elliptically
polarized lasers in this study. The free electron generation, optical properties of ionized material, the
spatial and temporal distribution of reshaped laser beams closely depend on the laser polarization. In
addition, the cross sections of multiphoton ionization by polarized lasers are fitted as a polynomial
function based on an extension of Keldysh theory, and simulated results are in good agreements with
experimental results.
Key words: Polarization; Femtosecond phenomena; Laser damage
0 Introduction
Femtosecond laser induced breakdown in dielectrics has been a hot research area, which
is of great scientific and engineering significance [1-6]. During the femtosecond laser
irradiation, electrons absorb the pulse energy, mainly through free electron generation and
heating, and then redistribute the absorbed energy to the lattice,