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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.
Such materials have the potential to simplify the design of high brightness green lasers. Neodymium glass (Nd:Glass) laser ~1.062 μm (silicate glasses), ~1.054 μm (phosphate glasses) Flashlamp, laser diode Used in extremely high-power (terawatt scale), high-energy multiple beam systems for inertial confinement fusion.
In astronomy, lasers have been used to create artificial laser guide stars, used as reference objects for adaptive optics telescopes. Lasers may also be indirectly used in spectroscopy as a micro-sampling system, a technique termed Laser ablation (LA), which is typically applied to ICP-MS apparatus resulting in the powerful LA-ICP-MS.
These lasers are also commonly doubled, tripled or quadrupled in frequency to produce 532 nm (green, visible), 355 nm and 266 nm beams, respectively. Frequency-doubled diode-pumped solid-state (DPSS) lasers are used to make bright green laser pointers. Ytterbium, holmium, thulium, and erbium are other common "dopants" in solid-state lasers.
The green laser is chosen for its unique ability to react with the human eye. [5] Dazzlers maintain eye safety by producing diverging light that is less coherent (focused) than typical lasers. This produces a larger, less concentrated spot at greater distances which is easier to aim at longer distances and retains the desired effect on targets.
On March 28, 2008, a coordinated attack took place using four green laser pointers aimed at six aircraft landing at Sydney airport in New South Wales, Australia. [ 37 ] [ 38 ] As a result of this attack plus others, a law was proposed in mid-April 2008 in New South Wales to ban possession of handheld lasers, including low-power classroom pointers.