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  • Photon Counting Modules
Feb 2011
Laser Components GmbHRequest Info
OLCHING, Germany, Feb. 3, 2011 — Laser Components GmbH has expanded its COUNT series of single-photon-counting modules to include the new COUNTblue devices. These combine the low count rates of the existing modules with higher detection efficiencies at shorter wavelengths.

More than 60% of incoming photons can be detected at 405 nm, more than 65% in the green, and more than 50%, typical, in the red. The semiconductor design ensures stable count rates and zero bi-stability. The good short-wavelength performance makes the modules suitable for use in a wide variety of applications in fluorescence spectroscopy and analysis, time-resolved single-molecule detection, particle sizing, astronomy, lidar and confocal microscopy.

The new modules feature the same robust design as the existing ones and are mechanically compatible with other commercially available photon-counting modules. The optional fiber connector allows easy plug-and-play connection to the sample and effectively eliminates background light.

The modules offer high quantum efficiency, ease of use and a wide dynamic range, and they combine the company’s ultralow-noise VLok silicon avalanche photodiode with quenching and signal-processing electronics from PicoQuant GmbH. Their spectral range is from 350 to 1000 nm, and incoming photons generate corresponding electrical pulses that can be read out at the transistor-transistor logic output. The gating function disables the module between measurements to provide overload protection.

The optional FC connector links the module to the sample via a multimode optical fiber.

Features include low dark count rates, single 12-VDC-supply operation, a nominal active area diameter of 100 µm, timing resolution of 800 ps and an operating temperature from 10 to 40 °C.


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The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.
FC connector
The fiber optic connector standard for Nippon Telephone & Telegraph (NTT) installations, developed with Nippon Electric Co. (NEC).
fluorescence spectroscopy
The spectroscopic study of radiation emitted by the process of fluorescence.
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