SEPTEMBER 24--Indigo Systems (Goleta, CA; www.indigosystems.com) has developed a dynamic, new method for processing standard indium gallium arsenide (InGaAs) detector material that enhances the short-wavelength spectral response. The new material, VisGaAs, is a broad-spectrum performing substance that enables both visible and near-infrared (NIR) imaging on a single photodetector. This advanced capability to capture images in both the visible and NIR makes it easier to perform tasks that previously required two separate detectors or cameras.
Visible and NIR images can be simultaneously acquired, displayed, and analyzed for comparison. Test results indicate VisGaAs can operate in a broad range from 400 nm (short wavelength visible) to 1700 nm (NIR). Indigo's special processing technique extends the short-wavelength spectral response by providing a 400-nm cut-on wavelength. VisGaAs focal-plane arrays (FPAs) are uncooled and use the same readily available starting material as Indigo's well-established standard InGaAs FPAs that cover the 900- to 1700-nm spectral range.
VisGaAs sensors can be used in many laser-based applications that are found at 850 nm. Other applications for VisGaAs include spectroscopy and any other tasks requiring two sensors to cover the spectral region from the visible to 1700 nm. Simultaneous imaging using ambient visible illumination and NIR laser illumination, and daytime/nighttime covert surveillance operations are two more areas that would benefit from the use of Indigo's new VisGaAs FPAs.