Patent ID: 7715453

Claim:
A method of controlling a laser projection system comprising a visible light source, wherein the visible light source comprises a semiconductor laser and a wavelength conversion device, the method comprises: generating at least a portion of a scanned laser image by configuring the semiconductor laser for optical emission of encoded image data and scanning an output beam of the visible light source across a plurality of image pixels or encoded data periods, the semiconductor laser comprising a gain section, a phase section and a wavelength selective optical element; and applying a phase shifting signal I/V Φ to the phase section of the semiconductor laser to periodically shift a plurality of cavity modes between an unshifted state and a shifted state, wherein the unshifted state and the shifted state are separated by approximately one half of the laser cavity free spectral range; wherein the method further comprises applying a drive signal I GAIN into the gain section of the semiconductor laser, the drive signal I GAIN comprising a plurality of data portions and corresponding wavelength recovery portions interposed temporally between corresponding data portions, wherein the data portions comprise respective drive amplitudes I D and drive durations t D , and the wavelength recovery portions comprise recovery amplitudes I R distinct from the drive amplitudes I D of the data portions and recovery durations t R less than the drive durations t D of the data portion.