P-233: Multimode DBR Laser Operation for Frequency Doubled Green Lasers in Projection Displays

In frequency doubled green lasers for laser scanning micro projectors, the wavelength fluctuations can create low spatial frequency and repeatable image artifacts that significantly degrade the image quality. We demonstrate a technique where the laser gain current is repeatedly reset to zero and the laser phase is randomized, both at high frequency. The image defects are replaced by high spatial frequency content noise that minimizes the detrimental effects in the human vision system.