Are laser rangefinders and laser detectors all visible light?
No, and on the contrary, mostly non-visible light. For short-distance ranging, the light source is mainly semiconductor lasers. At present, the wavelengths are mostly in the range of 800nm-900 nanometers, which are near-infrared lasers; for long-distance ranging, solid-state lasers and fiber lasers are the main light sources. Mainly, not visible. Another: 1.5Ⅹ wavelength is safe for human eyes and is the direction. Usually, the laser rangefinder has visible light mainly to indicate and tell the surveyor which target to measure.
