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Single-Photon Counters

BioPhotonics
Mar 2011
AUREA TechnologyRequest Info
 
The SPD_A_M2 ultralow-noise, high-quantum-efficiency near-infrared (900 to 1700 nm) single-photon detectors are manufactured by Auréa Technology. Their Geiger-mode InGaAs avalanche photodiode and thermoelectric cooler ensure high detection efficiency, a low and stable dark count, high speed and low jitter, with a performance superior to 5 x 10–6 per nanosecond. They exhibit good sensitivity in high-level detection, making them more effective than photomultipliers and microchannel plate photomultipliers, according to the company. Most photomultipliers deliver quantum efficiency of <1% in the near-infrared, while that of the SPD_A_M2 is adjustable from 5% up to 25%. The RoHS-compliant devices provide plug-and-play connection to PCs via a USB interface. Applications include single-photon counting, time-correlated single-photon counting, fluorescence and spectroscopy.


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GLOSSARY
fluorescence
The emission of light or other electromagnetic radiation of longer wavelengths by a substance as a result of the absorption of some other radiation of shorter wavelengths, provided the emission continues only as long as the stimulus producing it is maintained. In other words, fluorescence is the luminescence that persists for less than about 10-8 s after excitation.
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