Coherent light generators – Particular resonant cavity – Specified output coupling device
Patent
1992-03-30
1993-06-22
Davie, James W.
Coherent light generators
Particular resonant cavity
Specified output coupling device
385131, 372 45, H01S 319, G02B 618
Patent
active
052220958
ABSTRACT:
A semiconductor device structure capable of expanding a laser beam in one-dimension, collimating an expanding beam or focusing a nearly collimated beam. This semiconductor structure is typically comprised of three portions: a rib waveguide portion to propagate a beam of light in the quantum well region beneath the rib, an expansion region which incorporates a wider rib structure to allow the propagating beam to expand, and a rib etched lens portion to collimate the expanded beam of light. The shape of the rib etched lens portion is determined by Fermat's principle such that the optical pathlengths travelled by each ray of light are equated at a collimation plane positioned tangentially with the surface of the rib etched lens at the point at which an on-axis beam of light would strike the surface of the rib etched lens. Once the surface of the rib etched lens has been determined by Fermat's principle, the actual, maximum width of the rib etched lens is determined by Snell's law because at some point the amount of divergence is so great that the ray of light exiting the rib etched lens surface is not able to be refracted parallel to an on-axis ray. The rib etched lens may be utilized in alternative configurations requiring a lens element to focus and collimate light propagating therein. Such alternative configurations include the use of a pair of rib etched lenses positioned about a waveguide segment and a pair of expansion segments to form a laser resonator.
REFERENCES:
patent: 4780879 (1988-10-01), Chinone et al.
patent: 5084895 (1992-01-01), Shimada et al.
patent: 5157746 (1992-10-01), Tobita et al.
patent: 5175788 (1992-12-01), Miura et al.
patent: 5179566 (1993-01-01), Iwano et al.
Heidel Jeffrey R.
Zediker Mark S.
Courson Timothy H.
Davie James W.
Gosnell Guy R.
Hudson, Jr. Benjamin
McDonnell Douglas Corporation
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