Abstract
Alkali metal vapor was applied as sensitive frequency-conversion photo detectors, however, their application was limited by their natural narrow (∼100MHz) sensing frequency range. Here, Cs-Xe excimer is used to break this limitation. Demonstration of Cs-Xe frequency up-conversion photodetector is given. Using excimer transition, 550-552nm light is converted to 541nm fluorescence, this conversion wavelength band is much larger than a typical atom energy level transition. The frequency up-conversion background is mainly energy pooling fluorescence, which varies with Cs 6P3/2 state number density on roughly a cubic function. Atom collision generated Cs 12DJ, 9FJ levels are measured and discussed. By switching excimer transitions selected, e.g. using Cs nPJ (n=7, 8, …) related upward excimer transitions, it is possible to detect light with other wavelength from infrared to terahertz band. The concept in this work may get application in photon detection with high sensitivity.
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