[quote="Short Hand":5f896]
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Originally Posted by geeksitewtf
Since green direct injection laser diodes aren't readily available, this pointer is based on the use of Diode Pumped Solid State Frequency Doubled (DPSSFD) laser technology. A high power IR laser diode at 808 nm pumps a tiny block of Nd:YVO4 generating light at 1,064 nm which feeds a KTP intracavity frequency doubler crystal to produce the green beam at 532 nm.
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am i the only one who didn't understand this at all.....[/quote:5f896]
Green laser pointers are new to the market. The green laser has a wavelength of 532 nm, which the eye is much more sensitive to than the red lasers which have wavelength of 635-670 nm. That is the reason for the exceptionally brilliant visibility of the green beam. The generator of the green laser beam is what is called a "frequency-doubled" diode, which means that it is an infrared diode with a frequency of 1064nm (2 X 532). When approximately 500mW of power is passed through a crystal the resulting power of the green laser beam is only a few mW because the crystal conversion efficiency is very low. This is why the AAA batteries used in green laser pointers wear out faster than when they are used in red laser pointers.
Unlike red laser diodes, the price of green diodes varies by power output. 3 mW diodes cost substantially less to manufacture than 5 mW diodes. The price of green diodes will not decrease significantly until a straightforward 532 nm diode comes into common use. At this point it is still in the development stage.
Pulsed output results in a dash pattern when the laser terminal point is moved across a reflective surface. When the output is constant, moving the laser terminal across a reflective surface causes a solid line without dashes.
Blue diodes have been developed, but are under patent monopoly and hence very expensive. The diodes are large rectangular boxes; no laser pointers have yet been developed. Blue laser light does not appear as bright as green because the lower wavelength (473nm) is not as visible to the eye as green.Violet, with a lower wavelength than blue,is still less visible.
Lasers rock.
Lasers rock. -
06-23-2004, 12:36 AM
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