APDs Avalanche Photodiodes
An
Avalanche Photodiode (APD) is a photodetector that provides a built-in first stage of gain via avalanche multiplication. Provision of this internal signal gain is what differentiates an APD from a PIN photodiode. An
APD provides higher sensitivity and so is ideal for extreme low-level light detection and photon counting. Available as Silicon or InGaAs photodiodes, these devices detect in the 400nm - 1100nm range. Multiple configurations are available to provide a wide range of sensitivity and speed options.
The use of avalanche photodiodes instead of PIN photodetectors will result in improved sensitivity - useful in applications where the noise of the amplifier is high i.e. much higher than the noise in the photodetector. Thus, although an APD is always noisier than the equivalent PIN, improved signal-to-noise can be achieved in the system for APD gains up to the point where the noise of the APD is comparable to that of the amplifier. In very low bandwidth systems, the noise of the amplifier is likely to be very low, in which case, an avalanche photodiode may not be the best choice.
NEW PRODUCT - the C30737GA 1 x 64 Silicon APD Array provides a high 64 pixel count for higher resolution systems such as next generation LIDAR. Download the datasheet below.
Our full detector range can be accessed from the drop-down COMPONENTS menu above, and we can also help with customisation and bespoke assembly design.
Excelitas offer products including:
- High-volume, cost effective silicon APDs for Range Finding and Laser Meter applications
- Large area, UV-enhanced versions for Molecular Imaging (PET).
- Long wavelength enhanced versions for Analytical Applications.
- Multi element and quadrant APDs for Analytical Instruments.
- Standard, high performing versions for Industrial applications.