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Apparatus for stabilizing multiple laser sources and their application
| Details |
Inventors: Ventrudo, Brian F.; Berrang, Peter G.;
Assignee: SDL, Inc. (San Jose, CA)
Primary Examiner: Davie; James W.
Assistant Examiner:
Attorney, Agent or Firm: Carothers, Jr.; W. Douglas
Apparatus for stabilizing multiple laser sources having distinguishable optical characteristics, e.g., in polarization field or operational wavelength, comprises a plurality of semiconductor laser sources having respective lasing cavities capable of lasing within a narrow bandwidth of wavelengths and providing spectral outputs at their respective laser exit facets having different optical characteristics from one another. The spectral output beams of the sources may be coupled to respective optical fibers and the beams combined via a beam combiner, e.g., a polarizing beam combiner or a WDM combiner. The beam combiner combines the beam outputs forming a single beam which is launched into an output optical fiber. At least one feedback fiber grating is provided in at least one of the optical fibers with the number thereof depending upon distinguishable optical characteristics of the multiple laser sources. In the case of distinguishable optical characteristics in the form of polarization field, one grating is required and in the case of distinguishable optical characteristics in the form of operational wavelength, multiple gratings are necessary equal to the number of laser sources. The fiber grating or gratings have a reflectivity band for reflecting back a small portion of selected wavelengths of the single beam which are within the gain bandwidth of the laser sources while the remaining portion of the single beam transmitted through the grating or gratings to a final output. The grating or gratings have a reflectivity level approximately equal to or less than the reflectivity level of the laser source exit facets. The grating or gratings are positioned in the optical fiber or fibers to have an optical separation from the laser sources to cause the laser sources to operate in multiple longitudinal modes broadening the spectral output of the laser sources by several orders of magnitude. |
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DETAILED DESCRIPTION The present invention relates generally to multiple laser sources having spectral output beams having distinguishable optical characteristics which provide combined high power optical radiation with stabilized intensity output highly suitable for optically pumping fiber amplifiers or fiber lasers.
According to a principal aspect of this invention, apparatus for stabilizing multiple laser sources having distinguishable optical characteristics, e.
g.
, polarization fields or operational wavelengths, comprises a plurality of semiconductor laser diode sources having respective lasing cavities capable of lasing within a narrow bandwidth of wavelengths and providing spectral outputs at their respective laser exit facets having different optical characteristics from one another.
The spectral output beams of the sources may be combined via a beam combiner or a multiplexor/demultiplexor depending upon the distinguishing beam optical characteristic.
The beam combiner combines the beam outputs forming a single beam which is launched into an output optical fiber.
One or more Bragg gratings are provided in the output optical fiber, depending upon the distinguishing beam optical characteristic, controlling the wavelength of the laser sources.
In the case of distinguishing beam optical characteristics of different polarization fields, a single grating is utilized in the output fiber from the beam combiner.
In the case of distinguishing beam optical characteristics of different operational wavelengths, multiple fiber gratings, one for each laser sources are placed in the output fiber from the beam combiner or may be respectively placed in exit facet fibers coupling the respective laser source outputs to the beam combiner.
The fiber grating or gratings have a reflectivity band for reflecting back into the laser cavities a small portion of selected wavelengths within the bandwidth of the fiber grating and which are within the gain bandwidth of the laser sources.
The remaining portion of the single beam is transmitted through the grating or gratings to a final output for an applied application, such as pumping a fiber amplifier of fiber laser
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