Detection of mid-IR radiation by sum frequency generation for free space optical communication |
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| Authors: | Ketil Karstad Andr Stefanov Mark Wegmuller Hugo Zbinden Nicolas Gisin Thierry Aellen Mattias Beck Jrme Faist |
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| Institution: | a Group of Applied Physics, University of Geneva, 1211, Geneva 4, Switzerland;b Institute of Physics, University of Neuchâtel, 2000, Neuchâtel, Switzerland |
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| Abstract: | We present an experiment where mid-infrared radiation is detected indirectly via the second-order non-linear process of sum frequency generation. The mid-infrared sources used for the experiment are quantum cascade lasers, and we use a pump wavelength that yields an up-converted wavelength within the detection window of Silicon avalanche photo diodes. Compared with direct detection using state-of-the-art mid-infrared semiconductor detectors, the detection scheme we propose in this paper has the advantages of greater bandwidth and lower noise equivalent power. |
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| Keywords: | Sum frequency generation Mid-infrared detection Quantum cascade laser |
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