Laser Irradiation Studies Of Hgcdte Infrared Detectors

The infrared technology has been widely applied and the infrared detectors have been improved enormously. However, the infrared detectors can be easily damaged by high power laser, the research on the response character of the detectors to laser irradiation plays a very important role. The response characters of the middle-wave HgCdTe detector to the irradiation of laser are studied indetails. The detectors'major response to the irradiation of in-band light is optical effect, while thermal effect can be seen when the incident laser power density is somewhat higher, when irradiated by off band light, the detectors' major response is thermal effect, the research shows that enough power laser can interfere the work of the IR imaging in long distance. In detail, the major work that have been done are as follows1. Irradiated by the 1.06μm, 1.319μm, 3.8μm laser respectively, when the incident laser power density is between the saturation threshold and the damage threshold, the vibratingphenomenon and the zero-output phenomenon can be seen in the PV-type detectors'response curve.2. Some experimental study on the vibrating phenomenon has been done primarily. We conclude that the output of laser is stable and the reason of vibrating phenomenon isn't the unstable incident laser.3. A reasonable explanation is given to the zero-output phenomenon.4. Some phenomena were observed when the HgCdTe(PC,PV) detectors were irradiated by CW CO2 laser. we conclude that the detectors'major response to the irradiation of off-band light is thermal effect.5. IR imaging irradiated by CHOP CO2 laser is studied. we find that enough power laser can interfere the work of the IR imaging.