Irradiation of transparent dielectrics by sequential laser pulses with different wavelengths: a numerical studyThursday (25.06.2020) 13:50 - 14:10 Room 1
Propagation of two sequential laser beams in fused silica with their focusing inside the bulk has been investigated numerically. For the simulations, a model based on Maxwell’s equations was used. The simulation results have demonstrated a dramatic effect of a shorter wavelength prepulse on laser energy absorption of subsequent pulse with longer wavelength. Changing sequence of the pulses with a longer wavelength pulse coupling the sample first does not provide enhancement of absorption. The mechanisms of the dual wavelength effects are discussed in detail. These simulations point out that, at proper chosen irradiation conditions (wavelengths, time delay and energy ratio between pulses) the dual wavelength laser action on bandgap materials can have very high potential for controllable, highly-efficient laser energy coupling.
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