Laser diode. Green light is generated through an indirect process that starts with a high-power (usually 100-300 mW) infrared AlGaAs laser diode operating at 808 nm. The 808nm optical pump is a crystal made of neodymium-doped yttrium provanadate (Nd: YVO4) (or Nd: YAG or, less commonly, Nd: YLF) that irradiates the laser deeper with 1064nm infrared light. This laser action is Nd (III) and is present in all of these crystals due to the electron transition of fluorescent neodymium ions. The blue laser pointer of a particular wavelength, for example the 473 nm blue laser pointer is, in general, the same basic structure as the DPSS green laser. In 2006, many factories began manufacturing blue laser modules for mass storage devices, which are also used in laser Pointers. These are DPSS type doubler devices.
GaN (gallium nitride) semiconductor can be used to emit 405 nm purple beam. This is near ultraviolet light, near the limit of human vision, which fluoresces brightly in blue. As a result, on many white surfaces (white clothing, white paper, projections, etc.), blue spots look far away instead of purple spots. Fluorescent brighteners are widely used in product manufacturing to appear bright white. Ordinary non-fluorescent materials, fog, dust, etc. turn dark purple in color and cannot be reproduced on display or printed matter. The GaN laser directly radiates 405 nm without a frequency multiplier, eliminating the possibility of accidental and dangerous infrared radiation.
Standard high powered laser designators are commonly used in a variety of applications. Related to military training, astronomy, star observation, mass demonstration or old, fleeting use. They are the right size and require little maintenance or maintenance other than battery use. Which laser has the brightest color? 532nm green is always the brightest laser beam color in the same output. This means that the green 200mw laser will be 7 to 10 times brighter than any other color of 200mw laser, and is most commonly used in astronomy, military, and hobbies.
