Blue laser

A blue <a href="/facts/Laser/jk6PTvvT">laser</a> emits <a href="/facts/Electromagnetic_radiation/Ynx7ujCW">electromagnetic radiation</a> with a <a href="/facts/Wavelength/kcJU0ymz">wavelength</a> between 400 and 500 <a href="/facts/Nanometer/a98sjHyu">nanometers</a>, which the <a href="/facts/Human_eye/a24ua4fy">human eye</a> sees in the <a href="/facts/Visible_spectrum/frPBh8o5">visible spectrum</a> as <a href="/facts/Blue/DHWb8MUa">blue</a> or <a href="/facts/Violet_(color)/zcNJGApt">violet</a>.
Blue lasers can be produced by:

<ul><li>direct, inorganic diode <a href="/facts/Semiconductor_laser/TjHzJteV">semiconductor lasers</a> based on <a href="/facts/Quantum_well_laser/fL2l2qXg">quantum wells</a> of <a href="/facts/Gallium(III)_nitride/lmwUt4nk">gallium(III) nitride</a> at 380-417nm or <a href="/facts/Indium_gallium_nitride/a3MYdQrt">indium gallium nitride</a> at 450 nm</li>
<li><a href="/facts/Diode-pumped_solid-state_laser/E8mXGVsj">diode-pumped solid-state</a> <a href="/facts/Infrared/44XdJNcc">infrared</a> lasers with <a href="/facts/Second-harmonic_generation/NzWSrT3J">frequency-doubling</a> to 408nm</li>
<li>upconversion of direct diode semiconductor lasers via <a href="/facts/Thulium/G2905xhd">thulium</a>- or <a href="/facts/Praseodymium/2lnRJ9dH">praseodymium</a>-doped fibers at 480 nm</li>
<li>metal vapor, ionized <a href="/facts/Gas_laser/1eIYl75j">gas lasers</a> of helium-cadmium at 442 nm and 10–200 mW</li>
<li><a href="/facts/Ion_laser/Kd3jDNqk">argon-ion lasers</a> at 458 and 488 nm</li></ul>
Lasers emitting wavelengths below 445 nm appear violet, but are nonetheless also called blue lasers. Violet light's 405 nm short wavelength, on the visible spectrum, causes <a href="/facts/Fluorescence/qsJVT2qP">fluorescence</a> in some chemicals, like radiation in the <a href="/facts/Ultraviolet/kncBUqn5">ultraviolet</a> ("<a href="/facts/Black_light/pAQ4hnUq">black light</a>") spectrum (wavelengths less than 400 nm).

Blue laser open-in-new

Blue laser