Quantum Noise and Feed-Back Noise in Blue-Violet InGaN Semiconductor Lasers

Properties of the quantum noise and the optical feedback noise in blue-violet InGaN semiconductor lasers were measured in detail. We confirmed that the quantum noise in the blue-violet laser becomes higher than that in the near-infrared laser. This property is an intrinsic property basing on principle of the quantum mechanics, and is severe subject to apply the laser for optical disk with the small consuming power. The feedback noise was classified into two types of “low frequency type” and “flat type” basing on frequency spectrum of the noise. This classification was the same as that in the near infra-red lasers. key words: InGaN, blue laser, quantum noise, feedback noise, optical disk system