Laser scanning system employing laser mode switching using a binary mode switching signal

摘要

A diffractive-based laser scanning system that monitors portions of the laser light beams generated by a laser light source (e.g., VLD) employed therein to generate a mode switching signal indicative of a shift in the characteristic wavelength of the laser light beams emitted from the laser light source. In response thereto, a temperature controller selectively heats or cools the laser light source to minimize and avoid such wavelength changes. Mode switching is detected by monitoring a zeroth diffractive order beam produced by a diffractive element of the system. Temperature control of the laser light source is accomplished using active heating elements and passive cooling elements in thermal contact with the laser light source. In addition, temperature control of the laser light source is preferably accomplished over a heating range, whereby temperature within this range is approximated by a look-up table.