InGaAs Avalanche Photodetectors
Thorlabs' InGaAs Avalanche photodetectors (APD) are designed to offer increased sensitivity and lower noise compared to standard PIN Detectors, making them ideal for applications with low optical power levels. For extremely light-sensitive applications, Thorlabs offers Menlo Systems' APD310 high-sensitivity avalanche photodectector, which offers high-speed response up to 1 GHz.
Max voltage of 3.6 V for Hi-Z & 1.8 V for 50 Ω
Click to Enlarge
APD110C with fiber collimator, lens tube, lens tube collimator adapter, and X-Y translation mount. An aspheric lens (not visible) is mounted in the lens tube to focus the collimated light onto the detector.
The APD110C Avalanche Photodetector combines an InGaAs avalanche photodiode with a specially designed amplifier that includes an active lowpass filter to suppress out-of-band noise effectively. This avalanche photodetector, which is designed to detect light in the 900 - 1700 nm range, offers an exceptional low NEP and high transimpedance gain, making it ideal for fast low-light-level detection applications, such as spectroscopy, fluorescence measurements, lidar (laser radar), and optical range finders. Although the APD110C module is very sensitive to light, it will not saturate in ambient light.
The detector has a compact housing measuring just 2.0" x 3.0" x 1.1" (50.8 mm x 76.2 mm x 27.9 mm). The output and power leads to the detector come in perpendicular to the light path. An 8-32 (M4) tapped hole, provided on three sides of the detector, allows post mounting with the leads pointing left, right, or upward. Also, internal SM05 (0.535”-40) and external SM1 (1.035”-40) threads are concentric with the avalanche photodiode, which allows the user to mount lens tubes, fiber adapters, or other SM1- and SM05-compatible components directly to the detector housing. A zero input cap is included.
Fiber Coupling Note:
Menlo Systems' APD310 InGaAs Avalanche Photodetector provides an extremely light-sensitive alternative to traditional PIN photodiodes and is sensitve and fast enough for the characterization of pulsed lasers on the order of nanoseconds. The InGaAs avalanche photodiode of the APD310 provides exceptional performance for low-light applications in the 850 - 1650 nm. This APD maintains high-gain stability over the operating temperature range by utilizing a temperature-compensation circuit, which adjusts the ~150 VDC bias to ensure operation near the breakdown voltage.
A 40 dB gain amplifier is integrated into the package and is AC-coupled to band the output BNC. The output is matched to 50 O impedance. The detector has an electronic width of 1 MHz to 1 GHz and offers a user-accessible potentiometer providing 100 step gain adjustment. The APD310 has SM05 (0.535"-40) threads for easy integration into Thorlabs' entire family of lens tubes and cage assemblies. The bottom of the detector has a metric (M4) mounting hole and an M4 to 8-32 adapter for post mounting. The compact packaging allows the APD to be substituted directly into an existing setup while maintaining a small footprint on the benchtop. A location-specific power adapter is included with the detector; contact tech support for more information.
These photodetectors are not suitable for pulses longer than 30 ns or continuous light levels. Please see the FPD510 series for alternatives.