Technical explanation of shortwave infrared lens

The light in the shortwave infrared lens band is invisible to the human eye. The visible light spectrum extends from a wavelength of 0.4 microns (close to ultraviolet light, which is blue to the human eye) to 0.7 microns (dark red). Wavelengths longer than the wavelength of visible light can only be seen with dedicated sensors such as InGaAs. However, although light in the short-wave infrared region is invisible to the human eye, this light can interact with objects in a manner similar to the wavelength of visible light. In other words, short-wave infrared light is reflected light; its reflection from an object is very similar to visible light. Due to this reflective nature, short-wave infrared light will have shadows and contrasts on its images. The image of the InGaAs camera using the short-wave infrared lens with excellent performance can be comparable to the visible light image in terms of resolution and detail; however, the color of the short-wave infrared image is not the actual color. So this can make the object easier to be identified, and at the same time it can constitute one of the tactical advantages of short-wave infrared, that is, object or individual identification.