The blue sensitive PMA 175 is now available and offers a quantum efficiency up to 40 % at 400 nm.
The PMA detector is a single photon sensitive, fully integrated, fast time response and low noise photon sensor from PicoQuant. The PMA integrates a fast Photomultiplier Tube (PMT), a high voltage power supply and a pre-amplifier. For selected models thermoelectric cooling and automatic overload protection are available as an option.
These devices are built in a gold plated iron or nickel coated aluminum housing to achieve high level of RF and magnetic shielding and protection against the interference with other devices. The built in pre-amplifier is specially targeted at timing sensitive applications such as Time-Correlated Single Photon Counting (TCSPC).
Various photocathodes can be incorporated into the PMA to meet the user's needs. Three different cathode versions are available. A blue sensitive, low dark count version with very high quantum efficiency covers the spectral range from 185 nm to 700 nm. The standard unit is sensitive in the range from 185 nm to 820 nm and an extended red sensitive cathode covers the 300 nm to 900 nm range. A thermoelectrically cooled housing is available to reduce the dark count rate (recommended for red sensitive versions).
The housing is available in three different versions. The OEM design contains no safety shutter. Standard PMA-M features a security shutter, which can be interlocked with e.g. a sample chamber lid. Cooled versions (PMA-C Series) incorporate in addition an automatic overload detection function that closes the shutter in case of over-illumination.
Signal output for all models is a standard 50 Ohms SMA connector. The module only needs a 12 V DC supply line, which is delivered in the PMA-M and PMA-C versions.