Excelitas offers Avalanche Photodiodes (APDs) on both Silicon (Si) and InGaAs materials. Si APDs cover the spectral range of 400 nm to 1100 nm and the InGaAs APDs cover 950 nm to 1550 nm. An Avalanche Photodiode (APD) provides higher sensitivity than a standard photodiode and is for extreme low-level light (LLL) detection and photon counting.
The use of APDs instead of PIN photodetectors will result in improved sensitivity in many applications. In general, APDs are useful in applications where the noise of the amplifier is high, for example, much higher than the noise in the PIN photodetector.
- High-Performance Si APDs - feature low noise and high quantum efficiencies, offering the best compromise between cost and performance, especially in applications that demand high-speed and low-noise detection between 400 nm and 1100 nm.
- Large area, UV-Enhanced APDs - intended for use in a wide range of broadband low-light-level applications with spectral ranges from below 400 nm to over 700 nm. These APD types are available as flat-pack packages intended for applications that require direct detection or easy coupling to scintillator crystals.
- Hybrid Optical APD Receiver Modules - these modules come in a hermetically-sealed package containing a photodetector and a transimpedance amplifier, allowing low-noise pickup from the surrounding environment while reducing parasitic capacitance.
- High-Volume, Cost-Effective Si APDs - this series of APDs provides high responsivity between the 800 to 950 nm wavelength range and are designed for high-volume, low-cost applications.
- APD Quadrants - capable of eliminating dead space between pixels to help achieve optimal performance by utilizing a double-diffused “reach-through” structure, which provides ultra-high sensitivity at the 400 to 1000 nm wavelength range.
- High-Performance InGaAs APDs - large-area, high-speed APDs that provide high-quantum efficiency, high responsivity and low noise in the spectral range between 1100 nm and 1700 nm.
- 1064nm Long-Wavelength Enhanced Si APDs - made using a double-diffused “reach-through” structure, allowing it to achieve a long wave response without introducing undesirable properties. These APDs have quantum efficiencies up to 40% at 1060 nm.
- Laser microscopy
- PET scanners
- Laser scanners
- Laser range finders
- Speed guns
- Barcode readers
- Optical fiber receivers for communication
- Optical Time Domain Reflectometers (OTDR)