Two-photon absorption in volume-absorbing materials may be significant for high-power, short-pulse excimer laser irradiation. In the present work, the effects of two-photon absorption on the laser intensity propagation and the penetration depth are investigated. The temperature history of a glass plate during pulsed ultraviolet (UV) laser heating is predicted. The results show that the two-photon absorption can compress the volume-absorbing effect to surface absorption and increase the peak temperature on the glass surface. This will reduce the damage threshold, increase the energy loss, and reduce the accuracy of pulsed-laser calorimeters.
Issue Section:
Technical Notes
Keywords:
glass,
multiphoton processes,
two-photon processes,
laser beam effects,
ultraviolet radiation effects,
photothermal effects,
Heating,
Laser,
Microscale,
Radiation, ,
Thermophysical
Topics:
Absorption,
Glass,
Heating,
Lasers,
Photons,
Ultraviolet radiation,
Temperature,
Thermal analysis
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.Copyright © 2002
by ASME
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