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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 fluorescence in some chemicals, like radiation in the ultraviolet ("black light") spectrum (wavelengths less than 400 nm).
This is due to the shorter wavelength (405 nm) of the blue-violet laser employed. MOs use a 650 nm-wavelength red laser. Because its beam width is shorter when burning to a disc than a red-laser for MO, a blue-violet laser allows more information to be stored digitally in the same amount of space. Current generations of UDO2 media store up to ...
Helium–silver (HeAg) metal-vapor laser [3] 224.3 nm Scientific research Strontium vapor laser: 430.5 nm Scientific research Neon–copper (NeCu) metal-vapor laser [3] 248.6 nm Electrical discharge in metal vapor mixed with neon buffer gas. Scientific research: Raman and fluorescence spectroscopy [4] [5] Copper vapor laser: 510.6 nm, 578.2 nm
405 nm (blue-violet laser) 405 or 650 nm 650 nm (red laser) Numerical aperture: 0.85 0.65 0.85 or 0.6 0.6 Storage capacity (single side) per layer/maximum 33/100 GB
These laser diodes are mass-produced for the reading and writing of data in Blu-ray drives (although the light emitted by the diodes is not blue, but distinctly violet). In mid-to-late 2011, 405 nm blue-violet laser diode modules with an optical power of 250 mW, based on GaN violet laser diodes made for Blu-ray disc readers, had reached the ...
405 nm: InGaN blue-violet laser, in Blu-ray Disc and HD DVD drives; 445–465 nm: InGaN blue laser multimode diode for use in mercury-free high-brightness data projectors; 488 nm: InGaN green-blue laser; became widely available in mid-2018. 505 nm: InGaN bluish-green laser; also became widely available in mid-2018.
While a DVD uses a 650 nm red laser, Blu-ray Disc uses a 405 nm blue laser diode. Although the laser is called blue, its color is actually in the violet range. The shorter wavelength can be focused to a smaller area, thus enabling it to read information recorded in pits that are less than half the size of those on a DVD, and can consequently be ...
Red (660 & 635 nm), green (532 & 520 nm), and blue-violet (445 & 405 nm) lasers In most lasers, lasing begins with spontaneous emission into the lasing mode. This initial light is then amplified by stimulated emission in the gain medium.
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