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    • Sead Doric

    CEO, Doric Lenses
    Phone: 418 877 5600

    Sead Doric, Ph.D., is CEO of Doric Lenses (Québec City, QC, Canada).

    FIGURE 1. Coupling of a light source into an optical fiber can be less efficient, as with an incandescent lamp, or more efficient, as with a bright spot on a Ce:YAG crystal.
    Optics

    Lighting up innovative optical fiber applications

    Sead Doric
    June 1, 2019
    A new type of light source is needed for the small-diameter fiber-based illumination systems that are enabling leading-edge biomedical applications.
    FIGURE 1. Surface-emitting LEDs (left) and edge-emitting LEDs (right) typically have distinct emission patterns.
    Fiber Optics

    Fiber-coupling of LEDs depends on emitter type

    Sead Doric
    Oct. 1, 2004
    Approaches differ for coupling edge- and surface-emitting LEDs into optical fiber, and the Lagrange invariant plays an important role in designing fiber-coupling optics.
    Gradient-index microlens shapes diode-array output, producing elliptical beams (near-field). The short (vertical) axes equal the diameter of the gradient-index core; without additional optical elements the beams would overlap in the horizontal plane (far-field).
    Optics

    Easily fabricated microlenses correct laser-beam astigmatism

    Sead Doric
    Aug. 1, 1995
    Compact and economical diode lasers are the sources of choice for a wide variety of applications.