Researchers at the National Institute of Standards and Technology (NIST) have developed a new, highly sensitive, low-cost technique for measuring light near the infrared range. A single photon detector is the key device needed to build highly sensitive instruments for measuring spectra. Their approach is adapting a technique developed two years ago at NIST for quantum cryptography that “up converts” photons at one frequency to a higher frequency. The technique promotes the infrared photons up to the visible range using a strong, tunable laser.
Reference: Science Daily
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