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Optoelectronics/Displays??

Rohm's new tech to pave way for green laser diode

Posted: 27 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:ROHM? laser diode? crystalline growth technology? blue-violet laser diode? green diode?

Rohm announced that it has established a crystalline growth technology of non-polar gallium nitride (GaN), and succeeded in the trial production of a blue-violet laser diode.

The company said that its technology solved difficulty in the crystalline growth of non-polar GaN and realized the continuous-wave operation of the laser diode at room temperature. Moreover, the application of this technology will make it possible to develop a green laser diode, progressing toward the realization of laser diode in three all primary colors (i.e., red, green, and blue), ROHM said.

In its new technology, the company succeeded in eliminating stacking faults in the m-plane crystalline growth and achieved the continuous-wave operation of a 404nm laser diode at room temperature. The laser diode that ROHM manufactured on a trial basis is of typical type with a waveguide width of 1.5?m and a waveguide length of 600?m. The laser diode attained a threshold current for lasing of 28?A before the mirror coating. This performance is already equivalent to or higher than that of blue-violet laser diodes by the c-plane. The waveguide is formed to make maximum use of polarized light. The trial product is of easy-to-laser-operation device structure, which enables a reduction in power consumption as well.

Rohm is presently manufacturing a laser diode in a blue region (460nm) on a trial basis. By the end of this year, the company will aim at the development of a 532nm green laser diode. So far, the longest wavelength of GaN-based laser diode is 470nm with the conventional technology applied. If red, green, and blue laser light sources are applied, large-screen, high-definition display with a color range 1.5 to 1.7 times as high as the conventional NTSC is possible. If the green laser diode is manufactured, subminiature projectors will be available and expected to be included in mobile phones.




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