红外上转换材料共焦光学检测器研究

提出了一种利用共焦光学结构来检测红外上转换材料被激发光的方法。采用下述步骤来提高探测灵敏度:基于红外上转换材料的光谱分布,专门设计了具有对激发外光全反射、对被激发的可见光全透射的分光反射器,用共焦光学结构有效地提高了材料的上转换效率,采用在可见光区灵敏度、在红外光区截止响应GaAsP半导体光敏器件,配合专用放大电路,实现了被激发可见光的微弱光检测。检测器能够稳定检测混合比>0.3%的红外上转换材料,给出了实验结果。

Research on a Confocal Optical Detector for Infrared Up-conversion Material

A novel detector with confocal optical configuration was fabricated for detecting the weak emission light of infrared up-conversion material.The following approaches were imploemented for increasing the sensitivity of the detector.Based on the characteristics of emission spectrum of the up-conversion material,the special designed optical splitter was used to reflect the infrared beam into a confocal optical device,then the excited visible light with higher intensity returns to pass through this optical splitter with high transmission into GaAsP device,which has the high sensitivity to visible light and total cut-off to the infrared light.This detector with amplification circuits can be sensitive to the emission light from the up-conversion material with over 0.3% mixing ratio to ink.The results of detecting the IR ink marks of different mixing ratios wre given.