Numerical Simulation of Laser Irradiation Damage Pulse-Width Effect on Long-Wave Quantum Well Infrared Photodetector
Based on a two-dimensional axisymmetric thermal and mechanical simplified model of a quantum well infrared photodetector under 8.2 μm long-wave infrared mono-pulse laser irradiation,the transient temperature and stress-field distribution of the detector under various pulse widths were calculated using the finite-element method.In addition,variations in the thresholds of the detector for thermal decomposition,melting,and stress-induced damages under laser irradiation with the pulse width ranging from 1 to 300 ns were preliminarily determined.Results show that damage thresholds exhibit a downward trend as the laser pulse width decreases.Specifically,when the pulse width reduced from 300 to 1 ns,the decomposition damage threshold decreases by 23.10%(from 3.16 to 2.43 J/cm2),melting damage threshold decreases by 23.27%(from 5.50 to 4.22 J/cm2),and stress-induced damage threshold decreases by 44.62%(from 8.92 to 4.94 J/cm2).
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