电子俘获材料的红外最小可激发阈值

Minimum Excited Threshold in Electron Trapping Materials

在对撞脉冲锁模ＮｄＹＡＧ激光器产生的１．０６４μｍ超短红外脉冲激光激励下，采用参考光和测量光同时入射的测量方案，利用一台可见光条纹相机进行了电子俘获材料ＣａＳＥｕ，Ｓｍ的红外最小可激发阈值的研究，结果表明：在可见光条纹相机最小可探测能量密度Ｊｍｉｎ＝８．３×１０－１０Ｊ／ｍｍ２的条件下，测得电子俘获材料ＣａＳＥｕ，Ｓｍ的红外最小可激发阈值优于４．８×１０－９Ｊ／ｍｍ２。

By means of projecting a reference light and measuring the light on the photocathode of a streak camera, the minimum excited threshold in electron trapping materials can be measured. The infrared minimum excited threshold of CaS∶Eu, Sm is measured to be less than 4.8×10 -9 J/mm 2 by a visible streak camera. The minimum detectable energy density of the camera is less than 8.3×10 -10 J/mm 2 (532 nm). The phosphor investigated is efficiently stimulated with the 1.064 μm photons from a pulsed CPM Nd∶YAG laser. According to the result, it is shown that this kind of novel materials might be used in the ETM based infrared photocathodes and other fields.