The requirements of high power and longer wavelength that have made the development of picoprojectors for mobile phone and other applications a challenge may be close to being fulfilled.
The solution requires a laser with a lower threshold current, and it now looks like this could be achieved by switching to a family of II-VI semiconductor materials based on the alloy BeZnCdSe. Using this approach, a team from Sony, Hitachi and Japan's National Institute of Advanced Industrial Science and Technology (AIST) has just reported a low-threshold-current laser that emits 1.5 mW at 545 nm.
II-VI lasers are certainly not new. But innovations -- including the one above -- by several companies have created new excitement for green laser diodes.
Full story from Optics.org
Green lasers in action (SPIE Newsroom, June 2010)
Pinhole Cinema: Pico projectors take the floor (SPIE Newsroom, June 2010)