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Upconversion 1

Caption

Photographs of upconversion in a cuvette containing lead selenide/rubrene mixture. The yellow spot is emission from the rubrene originating from (a) an unfocused continuous wave 800 nm laser with an intensity of 300 W/cm2. (b) a focused continuous wave 980 nm laser with an intensity of 2000 W/cm2. The photographs, taken with an iPhone 5, were not modified in any way. Image credit: Zhiyuan Huang, UC Riverside.