Patent ID: 7889776

Claim:
A light source comprising: a first multi-spatial mode semiconductor diode laser; a first reflector having a three-dimensional pattern of refractive index variations within the reflector, the first reflector being in optical communication with the first semiconductor diode laser and aligned with an output beam of the first laser such that a portion of the output beam of the first laser is reflected back into the first laser by the first reflector; a second multi-spatial mode semiconductor diode laser; a second reflector having a three-dimensional pattern of refractive index variations within the reflector, the second reflector being in optical communication with the second semiconductor diode laser and aligned with an output beam of the second laser such that a portion of the output beam of the second laser is reflected back into the second laser by the second reflector; and a first beam combiner arranged to combine the output beams of the first laser and the second laser, wherein the output beams of the first laser and the second laser have different polarizations.