Sead Doric

CEO, Doric Lenses

[email protected]http://doriclenses.com

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.