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How does the Common DPSS Process?
A diode pumped solid state laser, or DPSS laser, combines a pump laser diode or diode array with a laser crystal to deliver a highly stable wavelength output.
The most common DPSS laser in use is the 532 nm wavelength green laser pointer. Green DPSS lasers are usually around 20% efficient, although some lasers have been reported to be 35% efficient. In other words, a green DPSS laser using a 2.5W pump diode would be expected to output around 500 mW of 532 nm light.
A powerful (>200 milliwatt) 808 nm wavelength infrared laser diode pumps a neodymium doped yttrium or thvanadate (Nd:YVO4) crystal which produces 1064 nm wavelength light. This is then frequency doubled using a nonlinear optical process in a KTP crystal, producing 532 nm light.
Blue DPSS lasers use an extremely similar process, except that the 808 nm light is being converted to 946 nm light, which is then frequency-doubled to 473 nm. Because of the lower gain for the materials, blue lasers are relatively weak, and are only around 3% efficient.
Yellow lasers use an even more complicated process. A 808 nm pump is used to generate 1,064 nm and 1,342 nm light, which is summed to become 593.5 nm. Yellow lasers are about as efficient as blue lasers, but due to their complexity and costs, most yellow DPSS lasers are only around 1% efficient.
To list the common DPSS processes, such as green laser,blue DPSS lasers and so on.
Keywords
DPSS Laser, Diode Pump Solid State Laser
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