Green Laser Diode Efficiency

1 they also want diode wavelengths emitting in the 530 535 nm range rather than the 515 520 nm of today s commercial green laser diodes.

Green laser diode efficiency.

Driven by voltage the doped p n transition allows for recombination of an electron with a hole. The pl series green laser diodes are mounted in a tiny 3 8mm package. The plt series green. Their material structure and epitaxy are both far more challenging than is the case with.

Laser diode tracking ratio characteristic. Furthermore 543 nm green lds were fabricated on c plane gan substrates. Majority carriers that are injected to the opposite side. 3 laser diodes can directly convert electrical energy into light.

Improvements have boosted the electrical efficiency of a diode laser bar to 71 percent top obtained at a heat sink temperature of 25 c. A typical laser diode specification for efficiency will be around 0 3 mw per ma at around 25 c and will fall by about 0 01 for each 10 c increase. The wall plug efficiency of the blue ld was 43 4 at 3a. Green laser diodes are available at max optical output power 80 mw and the efficiency is typically 5 6 at present.

Note that wpe alone does not factor into it the wavelength. These devices may not be a simple p n type diode but behave electrically identical to a p n junction diode. And pure green lds at 532 nm showed the optical output power of 1 19 w and the wall plug efficiency of 17 1 at the forward current of 1 6a. In a typical 50 w 970 nm diode laser bar bottom only 50 percent of the electrical input is converted to useful laser power.

The plot of the laser diode efficiency characteristic will show that the efficiency falls with increasing temperature. The wavelength of the new pl 520 green laser diode of 515 530 nm produces precisely the right green color for projection applications. Laser diodes while green emitting leds have been in existence for decades and have rapidly improved in recent years commercial laser diodes that emit green light are a recent development. A wall plug efficiency of 17 5 is realized at a current of 1 2 a under continuous wave.

So if you are. A laser diode ld injection laser diode ild or diode laser is a semiconductor device similar to a light emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode s junction. Wall plug efficiency wpe the wpe is the simply the light output in watts divided by the electrical power voltage x amps put into the laser diode. By utilizing the plane the first watt class green lasers at 530 nm is successfully fabricated and achieve maximum output powers in excess of 2 w which to the best of our knowledge is the highest value reported for any gan based green laser diode.

The wpe of the laser does not include the power of the drive circuitry external to the diode which can be significant.