Patent ID: 8780446

Claim:
A beam generating apparatus comprising: a laser light source, outputting a laser beam; a speckle suppressing module, comprising: a first biconic lens, disposed on a transmission path of the laser beam; a diffuser, disposed on the transmission path of the laser beam from the first biconic lens; and a second biconic lens, disposed on the transmission path of the laser beam from the diffuser; a light homogenizing module, disposed on the transmission path of the laser beam from the second biconic lens, wherein the laser beam is transmitted to the first biconic lens, the diffuser, the second biconic lens and the light homogenizing module in sequence; and a driving unit, driving the diffuser to move with respect to the laser beam so that a ratio of M squared of the laser beam exiting from the second biconic lens in a first direction to M squared of the laser beam exiting from the second biconic lens in a second direction is greater than 2, wherein the first direction is substantially perpendicular to the second direction.