Provided is a pyroelectric relaxor ferroelectric single crystal infrared detector. The detector comprises: a base provided with a pin; a casing having a window, the casing being packaged together with the base to form an accommodating space; a sensitive element (7) arranged within the accommodating space, the sensitive element being made from a relaxor ferroelectric single crystal; upper electrodes (5, 6) and a lower electrode (8) respectively arranged on an upper surface of the sensitive element and a lower surface of the sensitive element; an absorption layer (9) covering the upper electrodes of the sensitive element; a frame (3) supporting the sensitive element; an amplification circuit connected to the sensitive element. The present detector has advantages such as a high response rate, low noise and a high detection rate.
PYROELECTRIC RELAXOR FERROELECTRIC SINGLE CRYSTAL INFRARED DETECTOR