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Hybrid Photodetector Module

Photonics.com
Dec 2010
Hamamatsu Photonics UK Ltd.Request Info
 
WELWYN GARDEN CITY, England, Dec. 22, 2010 — Hamamatsu Photonics UK Ltd. has introduced a hybrid photodetector (HPD) module, the H10777, that dispenses with the traditional metal dynodes found within a conventional photomultiplier tube. Instead, photoelectrons are accelerated in a high electric field onto a silicon avalanche diode target that is connected to form the cathode/output of the device.

The advantage of the HPD construction is single photoelectron resolution capability, combined with very fast response compared to that delivered by conventional photomultiplier tubes. Two versions are available, a bialkali tube with spectral response ranging from 220 to 650 nm, and a GaAsP semiconductor cathode version operating from 300 to 720 nm, with a peak quantum efficiency of >45 %.

The H10777-01 offers a transit time spread of 35 ps FWHM. Intended applications include fluorescence lifetime measurements using time-correlated photon detection methods, time-of-flight measurements in high-energy physics experiments, lidar, biomedical research, atmospheric pollution measurement, laser scanning microscopy and fluorescence correlation spectroscopy.


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GLOSSARY
cathode
1. The negative electrode of a device in an electrical circuit. 2. The positive electrode of a primary cell or storage battery. 3. The primary source of electrons in an electron tube, serving as the filament in a directly heated electron tube, and in a coated metal configuration surrounding the heater in an indirectly heated one.
fluorescence correlation spectroscopy
A powerful method, referred to as FCS, for determining the average diffusion coefficients of fluorescent molecules in solution or membranes. FCS measurements rely on recording the transition of several thousands of molecules through the focal volume. The combination of short measurement times along with free positioning or scanning of the observation spot makes FCS an excellent tool for investigating diffusion heterogeneity over time and space.
lidar
An acronym of light detection and ranging, describing systems that use a light beam in place of conventional microwave beams for atmospheric monitoring, tracking and detection functions. Ladar, an acronym of laser detection and ranging, uses laser light for detection of speed, altitude, direction and range; it is often called laser radar.
photodetector
A device used to sense incident radiation.
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