Theoretical model for laser energy deposition in intrinsic optical materials and thermomechanical effects

Florian Bonneau; Bernard Cazalis

doi:10.1117/12.240362

27 May 1996 Theoretical model for laser energy deposition in intrinsic optical materials and thermomechanical effects

Florian Bonneau, Bernard Cazalis

Proceedings Volume 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995; (1996) https://doi.org/10.1117/12.240362
Event: Laser-Induced Damage in Optical Materials: 1995, 1995, Boulder, CO, United States

Abstract

On the basis of a microscopic theory for the interaction of intense laser irradiation with free electrons over the range from visible to near infrared, we calculate space-time energy deposition in SiO₂ for several wavelengths and laser pulsewidths. Most of the parameters used in the simulations are extracted from a Monte Carlo integration of the Boltzmann transport equation. We investigate the relative roles of multiphoton ionization, avalanche multiplication and free carrier absorption as intrinsic processes of carrier generation and pulse absorption for different laser irradiation conditions. The intensity profile distortion in the time domain of the transmitted pulse due to the rapid build-up of the plasma density is discussed. In the field of ultrashort laser pulses, damages exhibit a morphology dramatically different from that observed with long pulses: thin layers of material are removed by ablation. Therefore, we interfaced the space-time energy deposition with a 1D Lagrangian hydrodynamic code and estimated thermomechanical effects: stress evolution, spalling.

Citation Download Citation

Florian Bonneau and Bernard Cazalis "Theoretical model for laser energy deposition in intrinsic optical materials and thermomechanical effects", Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); https://doi.org/10.1117/12.240362

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