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Schematics of the cryo-cooling device, the enclosure and the temperature measurement setup. (a) The cryo-cooling device is in the enclosure in which dry nitrogen is constantly flushed. (b) The optical setup consists of filters (F), achromatic doublet lenses (L), and a dichroic mirror (M). The device was illuminated with a 365 nm LED and imaged with a CCD detector.
