Silicon Avalanche PhotodiodesSi-APD are suitable for the spectral range from 255 nm to 1100 nm.
Wide range of APDs
Since the foundation of Laser Components Detector Group Inc. in 2004 we have built a product range comprising high quality APDs as well as low cost versions. The active area ranges from diameters of 230 µm to 3.0 mm. APDs with even larger areas (5 mm, 10 mm, and 16 mm) are manufactured by our partner Advanced Photonix, Inc.
Depending on type and specifications APDs are used for rangefinding, speed measurements, laser radar, security scanners, spectroscopy, fluorescence measurement as well as test and measurements systems in industrial, military, and medical markets. The avalanche effect is most effective whenever there is not much light available.
The APDs are available in different TO-housings with certain options such as lens cap, integrated filter, with TEC, SMD housing, or just on ceramic submount. In addition to a wide range of standard products our strength clearly is in customer specific developments.
We gladly assist you with choosing the optimal APD for your application.
SAE Series (230 µm, 500 µm)
The SAE series
features an epitaxial structure and is available as red enhanced (i.e. optimized for visible wavelengths) or NIR enhanced (i.e. optimized for NIR wavelengths) version. These APDs are inexpensive and feature a very large gain and dynamic range. Datasheet
SAR Series(500 µm, 1.5 mm, 3.0 mm)
One of the most common applications of Si-APDs is rangefinding systems based on the time-of-flight method (LIDAR). In the time-of-flight method, a 905 nm pulsed laser diode emits a laser pulse that reflects off an object and is focussed through an optic onto an APD chip. In order to achieve an optimal signal-to-noise ratio, an external band-pass filter that blocks the surrounding light has to be mounted in front of the APD or the optic. In the new SARF series, this filter comes already integrated into the TO housing
The SAR series
is based on a reach-through structure with a high sensitivity across the entire spectral range from 400 nm to 1100 nm. At the same time, rise and fall times are extremely fast (typically 450 ps). These APDs feature extremely low noise low dark current. Datasheet
SARP Series(500 µm with 905 nm Bandpass-Filter)
Specifically selected APDs (SARP series
) can also be used for photon counting in Geiger mode (VR
), where a single photon triggers an avalanche impulse of approximately 108
charge carriers. This APD is particularly suited for spectroscopy, fluorescence measurement, medical technology, and high end LIDAR applications. Datasheet
SARF Series with Integrated Filter
Silicon APDs for Photon Counting
The SAP-series silicon avalanche photodiodes are primarily used in photon counting. This series features highest efficiency and lowest dark current rates.
The SAP500 series is based on a "reach through” structure with excellent quantum efficiency as well as extremely low noise and dark current. This APD, which has an active area of D=500 µm, can either be operated in normal linear mode (VR < VBR) with an internal gain of 250 or more or in "Geiger” mode.
In "Geiger” mode the APD is operated at a voltage that is larger than the breakdown voltage (VR > VBR); in this mode, single photons can be detected. Applications
The new SAP500 series is well suited for applications that quantify the weakest light signals (including single photons) and detect them in a time-resolved manner (e.g., LIDAR, spectroscopy, fluorescence measurements, or photon counting). The advantages compared to photomultipliers (PMTs) are as follows:
- Small compact design
- Very high quantum efficiency
- Not sensitive to magnetic fields
- Long lifetime
- Very good time resolution
- Smaller operating voltage
The SAP-500 series is available in a modified, hermetically-sealed TO-46 housing. A version is also available with a single-stage thermoelectric cooler in a TO-37 housing or a double-stage TEC in a TO-8 housing. Datasheet
Silicon APDs, UV sensitive
The detector was developed specifically for (bio)medical applications in which the smallest signals in the short-wave UV/blue spectral range have to be detected.
The SUR-Series is based on a silicon “reach-through” structure with high sensitivity in the DUV/UV wavelength range. The benefit of the SUR-Series is an extremely high sensitivity and low noise performance operating in the blue wavelength range and superior to any similar detector available presently on the market.
An important additional advantage of the new reach-through APD is its unmatched noise and sensitivity performance over the widest commercially available wavelength range, from 255 nm to 1000 nm.