Patent ID: 8665919

Claim:
A semiconductor laser module, comprising: a semiconductor device including a semiconductor laser configured to emit laser light, and a bending waveguide configured to propagate the laser light emitted from the semiconductor laser; a beam splitter configured to receive the laser light propagated through the bending waveguide and split the laser light into first laser light and second laser light; a plurality of detectors respectively arranged at different positions in a cross section of a light flux of the second laser light to detect the second laser light at the different positions in the same light flux; and a waveform shaping unit provided on an optical path of the laser light and configured to maintain a substantially linear relationship between an output of the semiconductor laser and each of detection values of the plurality of detectors, wherein at least a portion of the bending waveguide serves as the waveform shaping unit, the bending waveguide has a bending radius R satisfying R>A×Δn ^(− B ), where Δn is equivalent refractive index difference between a waveguide portion and a cladding portion of the bending waveguide defined as (refractive index of the waveguide portion-refractive index of the cladding portion)/refractive index of the waveguide portion, and A and B are constants with A=0.62 and B=1.59, and the bending radius R is equal to or larger than 1000 micrometers.