Phys. Rev. Lett. 74, 2248–2251 (1995)Laser-Induced Damage in Dielectrics with Nanosecond to Subpicosecond PulsesReceived 24 August 1994; published in the issue dated 20 March 1995 We report extensive measurements of damage thresholds for fused silica and calcium fluoride at 1053 and 526 nm for pulse durations τ ranging from 270 fs to 1 ns. Qualitative differences in the morphology of damage and a departure from the diffusion-dominated τ1/2 scaling indicate that damage results from plasma formation and ablation for τ≤10 ps and from conventional melting and boiling for τ>100 ps. A theoretical model based on electron production via multiphoton ionization, Joule heating, and collisional (avalanche) ionization is in good agreement with experimental results. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.2248
DOI:
10.1103/PhysRevLett.74.2248
PACS:
61.80.Ba, 42.70.-a, 71.38.+i
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