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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.
The emitters are usually lasers, making what is termed a laser dazzler. Most of the contemporary systems can be carried by a person, and operate in either the red (a laser diode) or green (a diode-pumped solid-state laser, DPSS) areas of the electromagnetic spectrum. The green laser is chosen for its unique ability to react with the human eye.
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.
Reports of lasers illegally pointed at aircraft in flight rose to a new high in 2023, the latest spike in a series of steady increases during the past decade.
For example, a 10-watt continuous-wave yttrium aluminium garnet laser at 532 nanometers (green) can appear brighter to the eye than an 18-watt continuous-wave argon-ion laser that outputs 10 watts of 514 nm (green-blue) light plus 8 watts of 488 nm (blue) light.
The GreenStar laser provides a simultaneous mix of pulse-width modulation and continuous wave (CW) operation for both day and night modes without overheating, unlike other dazzling devices that need to be operated pulsed to conserve power for cooling reasons.
Using lasers, scientists illuminated the tiny water droplets — and possibly pathogens — that are ejected into the air when a lid-less toilet is flushed.
A diode-pumped solid-state laser (DPSSL) is a solid-state laser made by pumping a solid gain medium, for example, a ruby or a neodymium-doped YAG crystal, with a laser diode.
They broadcast a running torrent of loud, disturbing sounds over a stereo — an eagle screeching, a child crying — and blasted a Hebrew rendition of the song "Baby Shark" on repeat, late at ...
An immense slab of "continuous melt" processed neodymium-doped laser glass for use on the National Ignition Facility. This is a list of laser types, their operational wavelengths, and their applications. Thousands of kinds of laser are known, but most of them are used only for specialized research.