Mechanisms of femtosecond laser-induced breakdown and damage in MgO

✍ Scribed by S.Z. Xu; T.Q. Jia; H.Y. Sun; C.B. Li; X.X. Li; D.H. Feng; J.R. Qiu; Z.Z. Xu

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 537 KB
• Volume: 259
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2005.08.059

✦ Synopsis

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.