Red high power semiconductor lasers are expected to be used for the light source of laser projection display systems. We have achieved 6.6 W CW operation of red semiconductor array lasers at a wavelength of 640nm. The energy conversion efficiency is as high as 29.7% at 25°C and the degradation rate after 1000-hours is less than 10%. The uniform near field pattern has been obtained by applying index-guided structure for broadstripe laser. We have developed projection display systems including hybrid light sources of UHP lamp andred semiconductor lasers, which can emphasize red color gamut. Speckle noise is dramatically reduced by moving screen that consist of gently rotating diffusion sheet and fixed diffusion plate.
