Stabile mode broad stripe semiconductor diode laser
OwnerJames Harrisoninventor
Life of this patent
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Abstract
A wide stripe laser having generally planar facets has most of its output facet coated for maximum transmission so that it provides substantially no feedback into the cavity. A reflective coating is used on only a very small segment of the output facet so that feedback is provided only for those rays that are incident nearly normal to the output facet. Such near-normal rays are reflected back into the cavity to initiate oscillation in the cavity's gain region. The rear surface of the cavity is coated to re-radiate the rays reflected from the small segment of the output facet but now these rays pass through the maximum transmission portion of the output facet.
Claims6
A semiconductor solid state laser having a resonating cavity with a gain region therein, a rear facet and an emitting facet, said laser having a reflective first coating on said rear facet, said emitting facet having thereon a highly transmissive coating over a major portion of said facet which corresponds to said gain region, the remaining minor portion of said emitting facet having thereon a low transmissive and more reflective coating.
A broad stripe semiconductor laser for emitting spatially coherent radiation comprising a cavity having at opposite ends thereof a substantially reflective facet and an output facet, said output facet exhibiting a substantial variation in reflectivity.
Dependencies are inferred from the claim text.