Patent ID: 9270085
Filing Date: 2016-02-23
CPC Classification: H01S

Claim Text:
1. A multi-wavelength semiconductor diode laser device, comprising: a semiconductor diode gain medium including one or more quantum well structures, each of the quantum well structures having an associated gain peak, the semiconductor gain medium further including a back facet configured for high reflection of laser light therein and a common front facet situated to emit a laser beam therefrom along a common emission axis; one or more collimation optics configured to receive the laser beam; and an external volume Bragg grating having a variable grating periodicity along the common emission axis and situated to reflect a portion of the laser beam back along the common emission axis and into the common front facet and to narrow the wavelength of at least a portion of the light generated by the semiconductor gain medium to a selected wavelength corresponding to at least one of the gain peaks so that an output beam is generated in the semiconductor diode gain medium and emitted from the common front facet and coupled out of the external volume Bragg grating along the common emission axis, the output beam having a plurality of output wavelengths.