Avalanche Photodetectors (APD) - a class of quantum detectors mostly for visible and near IR spectrum ranges are widely used in measurement technology and fiber communication systems (APD).
The main feature is the avalanche multiplication of charge carriers. A photon of light causes the generation of charge carrier, as in other semiconductor photodetectors, however, due to the features of ADP semiconductor p-i-n structure, the carrier initiates the avalanche generating additional charge carriers. The multiplication factor is hundreds and thousands. This effect provides a very high sensitivity of APDs, and a high speed of response, because of the drift of the charge carriers in a strong electric field.
Like many semiconductor photodetectors with other mechanisms of operation, the APDs have strong temperature dependency of operational parameters: parasitic dark current, the multiplication factor, speed of response.
Thermoelectric cooling is widely used to increase the performance of APD:
The APD chip are most often very miniature. Therefore, miniature multistage thermoelectric Peltier coolers (TECs) are required for thermal management.
RMT advises a wide range of miniature multi-stage TECs suitable for Avalanche Photodetectors.
Depending on the APD package design (housing), one can use a wide variety of standard sizes of multi-stage thermoelectric coolers.
TO-type packages are very common, for example, TO8.
For APDs in this package design the company RMT advises a wide range of standard thermoelectric cooling modules of the series and . There are also series of micromodules with increased cooling capacities and , which are suitable for miniature packages, for instance TO39.
To select a suitable solution and the optimal TEC for an application, the supporting is available at RMT’s website. For detailed modeling and calculations the company RMT provides our customers by free software or .And for advice and assistance.