The output signal and the disturb region of the PC(photoconductive) type infrared HgCdTe detector were analyzed at a response wavelength of 8-12 μs,when irradiated with transversely excited atmospheric CO2 laser at a constant biased current.The experiment results show that: when the irradiated energy density is less than 0.012 5 J/mm2,the output signal of the detector would decrease sharply when the laser irradiated on the detector photosurface,and the output signal of detector would restore immediately whe...