We demonstrated upconversion assisted detection of a 2.05-μm signal by sum frequency generation to generate a 700-nm light using a bulk periodically poled lithium niobate crystal. The achieved 94% intrinsic upconversion efficiency and 22.58% overall detection efficiency at a pW level of 2.05 μm pave the path to detect extremely weak infrared (IR) signals for remote sensing applications.
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Wong et al. (2014) studied this question.
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