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The study of the influence of the changes of laser parameters on the temperature field distribution of PbS detector irradiated under 2.79μm mid-infrared laser has important reference value. In this paper, the theoretical simulation of a typical PbS detector irradiated by a 2.79μm mid-infrared laser is carried out by using the Finite Element Analysis method (FEA). The maximum temperature of PbS detector irradiated by 2.79μm mid-infrared laser with different laser parameters is investigated. The maximum temperature on the photosensitive surface of the PbS detector under different conditions is obtained by adjusting the spot radius, pulse width, and repetition frequency of the simulated pulsed laser. The effects of the changes of spot size, repetition frequency and pulse width on the maximum temperature of the photosensitive surface are investigated. The simulation results show that under the same energy density irradiation condition, the maximum temperature of the photosensitive surface decreases with the increase of the spot radius and pulse width. Under the condition of the same spot radius and pulse width, the higher repetition frequency can make the maximum temperature of photosensitive surface reach a higher temperature. This work gives the law of the temperature changes of the photosensitive surface caused by changing the laser parameters, which is helpful to improve the damage resistance of PbS detector to high power 2.79μm mid-infrared laser step by step.
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