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.
The small width of the beam and the low power of typical laser pointers make the beam itself invisible in a clean atmosphere, only showing a point of light when striking an opaque surface. Laser pointers can project a visible beam via scattering from dust particles or water droplets along the beam path. Higher-power and higher-frequency green or blue lasers may produce a beam visible even in clean air because of Rayleigh scattering from air molecules, especially when viewed in moderately-to-dimly lit conditions. The intensity of such scattering increases when these beams are viewed from angles near the beam axis. Such pointers, particularly in the green-light output range, are used as astronomical object pointers for teaching purposes.
Laser pointers make a potent signaling tool, even in daylight, and are able to produce a bright signal for potential search and rescue vehicles using an inexpensive, small and lightweight device of the type that could be routinely carried in an emergency kit.
There are significant safety concerns with the use of laser pointers. Most jurisdictions have restrictions on lasers above 5 mW. If aimed at a person's eyes, laser pointers can cause temporary visual disturbances or even severe damage to vision. There are reports in the medical literature documenting permanent injury to the macula and the subsequent permanent loss of vision after laser light from a laser pointer was shone at a human's eyes. In rare cases, a dot of light from a red laser pointer may be thought to be due to a laser gunsight.[1] When pointed at aircraft at night, laser pointers may dazzle and distract pilots, and increasingly strict laws have been passed to ban this.
The low-cost availability of infrared (IR) diode laser modules of up to 1000 mW (1 watt) output has created a generation of IR-pumped, frequency doubled, green, blue, and violet diode-pumped solid-state laser pointers with visible power up to 300 mW. Because the invisible IR component in the beams of these visible lasers is difficult to filter out, and also because filtering it contributes extra heat which is difficult to dissipate in a small pocket "laser pointer" package, it is often left as a beam component in cheaper high-power pointers. This invisible IR component causes a degree of extra potential hazard in these devices when pointed at nearby objects and people.
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A laserpointer 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...
(collimation), a feature used in applications such as laserpointers and lidar (light detection and ranging). Lasers can also have high temporal coherence, which...
been paid to the risks posed by so-called laserpointers and laser pens. Typically, the sale of laserpointers is restricted to either class 3A (<5 mW)...
proof-of-concept experiments of directing a robot by a laserpointer are shown on video. Laser guidance spans areas of robotics, computer vision, user...
calls to license or ban laserpointers. Some jurisdictions such as New South Wales, Australia have restricted laserpointers as a result of multiple incidents...
"mouse click" + "some keys of a PC keyboard"; usually incorporating a laserpointer to pinpoint screen details. It is mainly used for presentations with...
5, 2017. Laserpointer attacks on the rise, Focus online, October 25, 2010, accessed December 2, 2017. Prison sentence after laserpointer attack, rp-online...
readers Laser engraving of printing plate Laser bonding of additive marking materials for decoration and identification, LaserpointersLaser mice Laser accelerometers...
store ClarkGableSpyGear.com. Gable was arrested in 2011 for shining a laserpointer at a police helicopter in Los Angeles. He pleaded guilty and was sentenced...
Cold's fruit gun after he fails to entertain the crowd. 26 14 "The LaserPointer" Elton John vs. Ozzy Osbourne Sandra Bernhard vs. Martha Stewart Tom...
to listen in on another room using a laserpointer; the process requires a reflective surface to send the laser beam back to them. When "Brent" and "Margot"...
inexpensive laserpointers to countless hobbyists. For many years, it had been assumed that certain characteristics of semiconductor laser diodes made...
states Gas laser – Laser in which electricity is discharged through gas Ion laser – Type of gas laserLaser diode – Semiconductor laserLaser excited phosphor –...
was a broken laserpointer for $14.83. Astonished, Omidyar contacted the winning bidder to ask if he understood that the laserpointer was broken; the...
one-milliwatt laserpointer exerts a force of about 3.3 piconewtons on the object being illuminated; thus, one could lift a U.S. penny with laserpointers, but...
A line laser is a device that employs a laser and an optical lens to project the laser beam as a line rather than a point (e.g. laserpointer). This may...
photograph, lightning strike, or extremely bright light, i.e. a searchlight, laserpointer, landing lights or ultraviolet light. The bright light overwhelms the...
University of Tokyo (Smart Laser Scanner and Laser Sensing Display). Combining a pico projector with a webcam, a laserpointer, and image processing software...
blames a man with a laserpointer for upstaging him, and derisively calls him a prop comic. The man retaliates by shining the laser on him. Jerry makes...
the handguard allowing users to mount other hardware, including: laserpointers or laser target and illumination devices. The standard Negev is chambered...
capabilities. It was the first product from Anybots that did not feature its laserpointer as a standard. However, its modular design allowed for customer-specified...
and watches are typically measured in microwatts. Milliwatt A typical laserpointer outputs about five milliwatts of light power, whereas a typical hearing...
powerful lasers, such as the world's most powerful laserpointer as well as his world record for 2020's most powerful continuous-wave handheld laser. "styropyro...
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