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Green Laser Pointers: Some Integral Facts

Posted Dec 04 2012 3:48am
University of California researchers are suffering from novel UV ZnO Laser Diode on Si that overcomes many of the errors of GaN devices.
·UC has become incredible electrically pumped surface-emitting UV ZnO diode lasers with high output power at 380 nm and low threshold current.
·UC has become incredible blue and UV LEDs that can operate at room temperature and also low lasing threshold current thickness of 10 A/cm2.
·The new UC devices are produce of readily produced materials appropriate for current manufacturing techniques
·Currently UC is attempting to tune these new materials for UV emission around 280 nm and for high powered green (around 520 nm) laser diodes
The new Laser Pointers are available in two versions. The PL 520 provides wavelengths of 515-530 nm, producing precisely the right green beam for projection applications. Its optical output power is 50 mW and the efficiency is 5-6%. The PL 515 has an output of 30 mW in a wavelength array of 510 to 530 nm, with the same efficiency. Both laser diodes have a package diameter of only 3. 8 mm, which enables the dimensions of projection units to be reduced considerably.
Green diode lasers are also ideal as point or line lasers for measuring ranges, as the human eye is most sensitive in the green selection, providing another important advantage over red laser light. For the same laser output, and therefore the same laser safety class, green light is more readily perceived by the human eye than red light that is typically used. This means that distance meters, such as those as used by building contractors, can be used over longer ranges.
Laser diodes and LEDs and cheap 200mw lasers have at least one thing in common: they both generate light (fig. 1). Simply described, a laser diode is a light amplifier capable of outputting a narrow, focused beam of light. Monochromatic in nature, laser diodes have an aperture that focuses non-collimated light into an square cone measuring approximately 0. 6-mm wide at the tip of the cone and widening to about 120 mm well away of 15m. Typical cone ways range from 12° to 30°.
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