A laser with a range of 400-1000 nm is referred to as what?

The correct answer, referring to a laser with a range of 400-1000 nm, is characterized as polychromatic. In the context of light, "polychromatic" describes light that contains multiple wavelengths. A laser encompassing a range of 400-1000 nm spans various colors in the visible spectrum and into the near-infrared region. This broad range supports the definition of polychromatic because it includes multiple wavelengths, rather than just one specific wavelength.

For further context, monochromic light is produced by lasers that emit light at a single wavelength, meaning they are not suitable descriptors for a range like 400-1000 nm. Similarly, while infrared and ultraviolet light exist within specific portions of the electromagnetic spectrum, they are not general classifications for a range that includes visible light along with infrared. Infrared light is beyond 700 nm, and ultraviolet lies below 400 nm, making both unsuitable as a definition for this 400-1000 nm range. The terminology of polychromatic accurately encapsulates the characteristics of the specified laser.