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期刊论文

Mechanisms of femtosecond laser-induced breakdown and damage in MgO

贾天卿S.Z. Xu a* T.Q. Jia ab H.Y. Sun a C.B. Li a X.X. Li a D.H. Feng a J.R. Qiu a Z.Z. Xu a

Optics Communications 259 (2006)274-280,-0001,():

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摘要/描述

Single-shot laser damage threshold of MgO for 40-986 fs, 800 nm laser pulses is reported. The pump-probe measurements with femtosecond pulses were carried out to investigate the time-resolved electronic excitation processes. A theoretical model including conduction band electrons (CBE) production and laser energy deposition was applied to discuss the roles of multiphoton ionization (MPI) and avalanche ionization in femtosecond laser-induced dielectric breakdown. The results indicate that avalanche ionization plays the dominant role in the femtosecond laser-induced breakdown in MgO near the damage threshold.

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