LASER MODULE

The laser module of the present disclosure comprises the following structural elements:a laser diode including a plurality of emitters arrayed along a first line, and emitting a laser beam from each one of the plurality of emitters at an emitting surface;a first collimator lens disposed facing the emitting surface of the laser diode, and having positive power along a fast axis;a beam twister disposed facing the laser beam given off from the first collimator lens, and turning the laser beam by approx. 90 degrees; andan optical element disposed facing the laser beam given off from the beam twister, and including a plurality of incident surfaces placed in a stepped shape.The laser module satisfies conditional expression (1) below for each of the incident surfaces of the optical element:where, x is a distance from the output surface of the beam twister to the incident surface of the optical element,W is a width of the incident surface along the first line,is a wavelength of the laser beam,f is a focal length of the fist collimator lens, andw0 is a beam diameter of the laser beam along a line perpendicular to the first line, the beam diameter being measured at an output surface of each one of the emitters.