| Autor: |
Bogatyrev, I. B., Grojo, D., Delaporte, P., Leyder, S., Sentis, M., Marine, W., Itina, T. E. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Nov2011, Vol. 110 Issue 10, p103106, 10p, 1 Diagram, 1 Chart, 7 Graphs |
| Abstrakt: |
We present a theoretical model, which describes local energy deposition inside IR-transparent silicon and gallium arsenide with focused 1.3-μm wavelength femtosecond laser pulses. Our work relies on the ionization rate equation and two temperature model (TTM), as we simulate the non-linear propagation of focused femtosecond light pulses by using a 3D finite difference time domain method. We find a strong absorption dependence on the initial free electron density (doping concentration) that evidences the role of avalanche ionization. Despite an influence of Kerr-type self-focusing at intensity required for non-linear absorption, we show the laser energy deposition remains confined when the focus position is moved down to 1-mm below the surface. Our simulation results are in agreement with the degree of control observed in a simple model experiment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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