Laser-interfered studies in HgCdTe infrared focal plane array detector by high-repetition-rate mid-infrared supercontinuum fiber laser

The interference characteristics studies of HgCdTe infrared focal plane array (IRFPA) detector are of great significance to improve its application performance, but few studies of laser interference have been undertaken on infrared detectors irradiated by high-repetition-rate mid-infrared supercontinuum fiber laser. In this work, we used the fiber amplifier with 48.16 MHz repetition rate, the 3 dB spectral bandwidth of 1.5-3.7 mu m and maximum average output power of 5 W to irradiate the HgCdTe IRFPA detector. The results showed that the performances of detector were sensitive to laser power, and interference threshold was 0.043 W/cm2 and the temporary blindness threshold was 0.14 W/cm2 with multi-pulse accumulation. The interference mechanism was optical effect and thermal effect acting together on the HgCdTe detector under laser irradiation. Based on twotemperature model, the work theoretically simulated laser-irradiated temperature distribution in detector and the results were approve the experimental conclusions. The research results provide theoretical and experimental basis for photoelectric countermeasures, infrared guidance and other fields.

Automated summary

In this study, the interference characteristics of HgCdTe infrared focal plane array (IRFPA) detector were investigated under irradiation from a high-repetition-rate mid-infrared supercontinuum fiber laser. The results showed that the detector's performance was sensitive to laser power, with an interference threshold of 0.043 W/cm2 and a temporary blindness threshold of 0.14 W/cm2. The interference mechanism involved both optical and thermal effects on the HgCdTe detector. These findings provide theoretical and experimental basis for photoelectric countermeasures, infrared guidance, and other related fields.