Green laser pointers appeared on the market circa 2000, and are the most common type of DPSS lasers (also called DPSSFD for “diode pumped solid state frequency-doubled&rdquo. They are more complicated than standard red laser pointers, because laser diodes are not commonly available in this wavelength range.
The green light is generated in an indirect process, beginning with a high-power (typically 100–300 mW) infrared ALGaAs laser diode operating at 808 nm
Slightly more expensive ones use a red-orange 635 nm diode, making them more easily visible than their 670 nm counterparts because of the greater sensitivity of the human eye at 635 nm. Other colors are possible too, with the 532 nm green laser pointer being the most common alternative. In the past few years, yellow-orange laser pointers, at 593.5 nm, have been made available. In September 2005, handheld blue laser pointers at 473 nm have also become available. In early 2010, “Blu-ray” (actually violet) laser pointers at 405 nm have also become available
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