Fig. 1. Sketch map of experimental system

Fig. 2. Response voltage vs laser energy

Fig. 3. Response voltage vs time（E=220mJ，PRF=10Hz）

Fig. 4. Damage morphology of PbS detector with laser fluence of 366.69J/cm²：（a）before irradiation，（b）damage overall appearance，（c）damage spot edge，（d）damage spot center

Fig. 5. Particles attached to the surface of sapphire window，（a）149.22J/cm²，（b）366.69J/cm²

Fig. 6. Schematic diagram of PbS detector

Fig. 7. Theoretical model of PbS detector irradiated by 2.79 μm laser

Fig. 8. Temperature distribution with laser fluence of 10 J/cm²,^{（a）contour of temperature distribution in PbS detector,（b）temperature distribution on PbS surface,（c）temperature distribution on axis}

Fig. 9. Schematic diagram of air flow trajectory inside the detector

Fig. 10. The relationship between maximum temperature of PbS and laser energy fluence

Fig. 11. The relationship between the maximum temperature of PbS and the number of pulses under different repetition frequencies