Abstract
GaN-based blue and green laser diodes (LDs) have already been widely adopted in light sources for laser
display systems. The authors explain the status of the development for blue and green LDs and discloses
new high-power blue and green LDs based on a c-plane GaN substrate which Nichia has recently fabricated.
The optical output power and wall-plug efficiency of blue LDs with an operating current of 3.0 A
was 5.67 W and 48.1%，respectively. Additionally, this paper introduces some LD packages that incorporate
the recently developed blue/green LDs and those packages are used for the light sources of laser
projectors, digital cinema, laser head lights, etc.
