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Laser pointer. 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.
Laser safety. Laser radiation safety is the safe design, use and implementation of lasers to minimize the risk of laser accidents, especially those involving eye injuries. Since even relatively small amounts of laser light can lead to permanent eye injuries, the sale and usage of lasers is typically subject to government regulations.
1–5 mW: Laser pointers: 5 mW: CD-ROM drive 5–10 mW: DVD player or DVD-ROM drive: 100 mW: High-speed CD-RW burner 250 mW: Consumer 16× DVD-R burner 400 mW: DVD 24× dual-layer recording: 1 W: Green laser in Holographic Versatile Disc prototype development 1–20 W: Output of the majority of commercially available solid-state lasers used for ...
To give another example, of a more powerful laser—the type that might be used in an outdoor laser show: a 6-watt green (532 nm) laser with a 1.1 milliradian beam divergence is an eye hazard to about 1,600 feet (490 meters), can cause flash blindness to about 8,200 feet (1.5 mi/2.5 km), causes veiling glare to about 36,800 feet (7 mi; 11 km ...
The United States five-dollar bill (US$5) is a denomination of United States currency. The current $5 bill features U.S. president Abraham Lincoln and the Great Seal of the United States on the front and the Lincoln Memorial on the back. All $5 bills issued today are Federal Reserve Notes. As of December 2018, the average life of a $5 bill in ...
The AN/PEQ-16 was introduced to the market in 2009, [3] where it began to replace the AN/PEQ-15 on US Marine Corps small arms. The PEQ-16 is a slightly different form-factor to the PEQ-15, being shorter, but larger overall. The most notable adopter of the AN/PEQ-16 as the standard infantry LAM was the United States Marine Corps (USMC) with the ...
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