Method and apparatus for concentrating the energy of laser diode

Details Method and apparatus for concentrating the energy of laser diode Method and apparatus for concentrating the energy of laser diode

1994-12-13

1996-10-22

Ngo, John

Optical waveguides

With optical coupler

Input/output coupler

G02B 632

Patent

active

055685773

ABSTRACT:
Methods and apparatus are disclosed for concentrating the energy of laser diode beams by imaging them to obtain a superimposed image and a combined numerical aperture at a focal plane and by guiding them between reflective boundaries to maintain a lesser second numerical aperture at the focal plane. The combined numerical aperture preferably matches the second numerical aperture so that the energy can be received into the entrance end of optical fibers whose numerical apertures also match the second numerical aperture. A described embodiment utilizes collimating lenses and an off-axis parabolic reflector. The exit ends of the optical fibers can be grouped and fractionally magnified into a concentrated energy pattern. The final image can be imposed into a single optical fiber for passage along remote or convoluted optical paths.

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IBM Technical Disclosure Bulletin, vol. 34, No. 10A, 1 Mar. 1992, pp. 264-265, "Efficient fiber coupler using an ellipsoidal reflector".
Optical Engineering, vol. 33, No. 11, 1 Nov. 1994, pp. 3662-3669, Weiqun Chen et al. "Design approaches for laser-diode material-processing systems using fibers and micro-optics".

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