Picosecond infrared laser stimulation of luminescence in CaS : Eu,Sm

The response and decay time of the optically stimulated luminescence of ele ctron trapping material CaS:Eu,Sm to ultrashort infrared pulse has been mea sured by projecting two 1.064 mu m laser pulses on the photocathode of a st reak camera, one illuminates ETM screen on the photocathode, another illumi nates the photocathode after a frequency doubling. The result indicates tha t the response and decay time is less than 14.3 ps. The decay law of the in frared upconversion luminescence followed by CaS:Eu, Sm is also presented. The work shows that this kind of electron trapping materials could be widel y used in the rapid infrared upconversion and detection. (C) 1999 American Institute of Physics. [S0021-8979(99)02001- 0].