InGaAs Quadrant Photodiodes consist of four separate active regions on one detector. Each segment gives a current output related to the location of light on the detector, making these ideal for precise position detection and alignment applications.
NEW! Tetraleteral Germanium photodetector allows continuous position sensing over a large area. This product is designed for use in optical metrology and beam alignment applications.
GPD Tetralateral Position Sensors and Quadrant Photodiodes are advanced technologies designed for high-precision position sensing across various industries, including optical systems, metrology, and industrial processes.
GPD Tetralateral Position Sensors:
These sensors use a tetralateral design to enable continuous two-dimensional position detection over a large area, typically up to 10 x 10 mm. Operating within the spectral range of 800–1700 nm, they are available in configurations such as Germanium and InGaAs photodiodes. Common applications include optical metrology, beam alignment, and linear position sensing, providing seamless and accurate measurements.
Quadrant Photodiodes:
Quadrant Photodiodes comprise four photodetector elements arranged in a quadrant layout, allowing for precise two-dimensional position detection. They are highly sensitive, provide rapid response times, and offer broad spectral coverage with materials like Silicon and InGaAs supporting a variety of wavelengths. Their typical applications include laser beam alignment, optical tracking (e.g., in satellite communication), and tasks requiring precise measurements, such as microscopy and industrial alignment.
Both technologies are vital for their respective roles, delivering exceptional accuracy and reliability in position sensing and alignment tasks across diverse fields
Position Sensing Detectors from GPD
Photodiodes | Features | Applications |
Quadrant Photodiodes |
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Tetralateral Position Sensors |
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If you require something outside of the standard options, we are happy to discuss custom designs tailored to your unique specifications.
Feature | Description |
Mounting Configurations | TO PACKAGES: A wide variety of TO packages are available. Selection is based on the size of the photodiode and the pinout requirements of your application. CHIP ON CERAMIC SUBMOUNT: GPD offers a variety of standard ceramics and can also design a ceramic unique to your application. Chips can be bonded with epoxy or eutectic solder. |
Fiber Coupling | Many applications require high-speed photodiodes or APDs to be coupled into single-mode or multi-mode optical fibers. GPD is able to work with a variety of fibers and can add most standard connectors to provide a high-quality, reliable device. |
Windows and Lenses | Many of the GPD photodiode packages come standard with a glass or sapphire window. Additionally, GPD can provide custom windows best suited for your application. Lenses can be added to many TO packages if a larger field of view is required for increased detection. In some cases, lenses can also be added directly to the photodiode or APD chip. |
Filters and Coatings
| When the light incident on your detector needs to be manipulated, the best course of action may be to apply a coating or filter specific to your application. For maximum signal, AR coatings can be applied to one or both sides of windows, and also to the photodiode chip itself. Band-pass or long-pass filters can be applied to windows to tailor the working wavelength range of the detector system. In high-power scenarios, partially reflective coatings can attenuate optical power to a manageable level. Where reflections are undesirable, absorptive filters can often be used for attenuation in place of a traditional glass window. |
Thermoelectric Cooling
| In noise-sensitive applications, many customers cool their photodiodes to reduce thermal noise and get the best performance. GPD Optoelectronics offers single- and dual-stage thermoelectric coolers built into TO packages with the photodiodes. |
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