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.

For more on this subject please refer to Spectroscopy.