Ultra Low Noise Silicon and InGaAs APD pre-amplifier modules are available from Pacer.

The LLAM (Low Level Analogue Module) range offers high quantum efficiency spectral response over 400-1700nm, noise equivalent power levels of 25fW/(root)Hz, bandwidth optimisation for between 1MHz-300MHz, and constant responsivity over a 5-40 deg C ambient temperature range.

Designed for LIDAR, range finding, analytical instruments, and confocal microscopy, Silicon and InGaAs APD's both function with thermo-electric coolers and pre-amplifiers to offer extreme low light detection, just above the photon counting region.

The units, manufactured by PerkinElmer, are available in standard configuration with 800µm silicon or 200µm InGaAs APD's, but can also be customised dependent upon spectral and optical demands to meet customer applications.

See http://www.pacer.co.uk