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Abstract

Laser-to-waveguide coupling devices and methods are disclosed employing an aperture, and an imaging lens. The aperture clips the beam edges to flatten the spatial intensity profile, and the lens mirror-images the plane of the aperture onto the waveguide face with appropriate magnification or demagnification to match the input beam dimensions to those of the waveguide. In one preferred embodiment, a first focusing lens is also employed in conjunction with a pinhole aperture and a second imaging lens. The first focusing lens focuses the laser beam onto the aperture and thereby reduces the optical path length. The second imaging lens images the plane of the aperture onto the waveguide.

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First Claim