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Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
Smith & Wesson, Model 686 Plus equipped with Crimson Trace laser grip. Crimson Trace is an American manufacturer of laser sight equipment, chiefly but not exclusively for pistols. The firm specializes in in-line upper-grip-mounted red and green laser units, trigger-guard mounted sights, and training units.
The Outfit DEC or Laser Dazzle Sight (LDS) is a British ship-based laser. The veiling-glare laser utilizes ultraviolet light and is designed to dazzle by causing fluorescence in the lens of the human eye. There are other such laser weapon systems in development. [2] [23] [24] [25] PHaSR, a United States dazzler-style weapon
488 nm: InGaN green-blue laser; became widely available in mid-2018. 505 nm: InGaN bluish-green laser; also became widely available in mid-2018. 510–525 nm: InGaN green diodes developed by Nichia and OSRAM for laser projectors. [30] 635 nm: AlGaInP better red-laser pointers, same power subjectively twice as bright as 650 nm
A green laser pointer is a frequency doubled Nd:YVO 4 diode-pumped solid state laser . [48] Nd:YAG can be also made to lase at its non-principal wavelength. The line at 946 nm is typically employed in "blue laser pointer" DPSS lasers, where it is doubled to 473 nm. [49] [50] [51]
Laser pointers, even those sold for less than $20 online, can distract pilots or cause flash blindness — of particular danger during takeoff and landing, when many incidents are reported.