Three-band high-pass filter for infrared detector

Infrared detectors have very important applications in space detection, target detection and tracking technology, the performances of which directly affect the accuracy and credibility of the acquisition of data. In order to improve the sensitivity of infrared signal analysis and reduce the detector noise level, using the electron beam and ion beam assisted deposition technology, the high-pass filter with 3 m～5 m high pass rate, 1.064 m～2.5 m band cutoff was prepared on the chemical vapor deposition (CVD) ZnS substrate. In order to effectively prevent the laser at 1.064 m band from injuring the detector and ensure the normal work of the detector, according to the laser output power, the highpass filter film series having 1%, 0.1%, 0.01% attenuation capability respectively for laser at 1.064 m wave band were prepared, which made the infrared detector more flexible and intelligent.