24 April 2002 Application of high-speed IR converter in scientific and technological research
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Abstract
The infrared (IR) image converter is based on a planar semiconductor-gas discharge structure operating at a temperature of about 100 K in the spectral range of 1.1 to 3.5 micrometers . Semiconductor material and gas are Si:Zn and Ar respectively. The conversion of input IR images into the visible is characterized by a time constant in the order of a few microseconds, the dynamic range is at least 104 and good linearity is observed. Together with the Hamamatsu framing camera C4187 the IR converter has been applied to investigate in the microsecond range the spatio-temporal dynamics of radiation of 1.318 micrometers Nd:YAG laser. The second application was the study of the mode evolution of an Er:YSGG laser operating at a wavelength of 2.79 micrometers and an Er:YAG laser with a wavelength of 2.94 micrometers using a pulse length of 100 to 150 microsecond(s) , and a pulse energy of about 40 mJ. In this case, the IR converter is combined with an intensified CCD camera, of which the exposure time is down to 10 microsecond(s) . In the third application, the IR converter is used in combination with a fast CMOS camera to monitor Nd:YAG laser welding of stainless steel samples at the rate of 320 frames/s.
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Sascha Matern, Sascha Matern, Valery M. Marchenko, Valery M. Marchenko, Yuri Astrov, Yuri Astrov, Leonid Portsel, Leonid Portsel, Hans-Georg Purwins, Hans-Georg Purwins, } "Application of high-speed IR converter in scientific and technological research", Proc. SPIE 4669, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III, (24 April 2002); doi: 10.1117/12.463429; https://doi.org/10.1117/12.463429
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