SWIR Spectroscopy

Near-Infrared (NIR) and Short wave Infrared (SWIR) Spectroscopy Using InGaAs Linear Arrays and Detectors

Indium Gallium Arsenide (InGaAs) is the most common material used in infrared spectroscopy for studying light in the wavelength range of 0.9 to 1.7 microns. Sensors Unlimited offers both InGaAs cameras and linear arrays for OEM manufacturing that respond to three different IR spectroscopy wavelength bands: 0.9 to 1.7 µm, 1.1 to 2.2 µm, and 1.3 to 2.6 µm. Like silicon, InGaAs detectors are usually cooled thermoelectrically or cryogenically to allow for long exposure data acquisition. Photoluminescence, Raman Spectroscopy, Laser Diode Characterization, and Fluorescence are among the most common infrared spectroscopy applications that require a high sensitivity detector with low noise in the NIR and SWIR.

The diagram below shows how using mirrors and a diffractor, a spectrometer directs light from a source into a device, like an InGaAs linear array, that analyzes it and provides the user with spectral information.

Innovative research and production of InGaAs material with high quantum efficiency (QE) and low dark current has made Sensors Unlimited the world leading supplier of linear photodiode arrays for IR spectroscopy camera systems. Industry demand has driven the development of many different linear arrays andcameras. For example, Sensors Unlimited has produced an uncooled, high speed linear focal plane array (FPA) camera capable of reading out 47,000 lines/second for an alternative to Fourier Transform Near Infrared (FTNIR) spectroscopy. For low light level, high sensitivity, high resolution applications, Sensors Unlimited offers many options including a 500 micron tall (25 micron pitch) array. Whatever your near or short wave infrared spectroscopy application is, SUI can provide the solution.