Abstract
A range of practical nonimaging designs for optical fiber applications is
presented. Rays emerging from a fiber over a restricted angular range (small
numerical aperture) are needed to illuminate a small near-field detector at
maximum radiative efficiency. These designs range from pure reflector
(all-mirror), to pure dielectric (refractive and based on total internal
reflection) to lens–mirror combinations. Sample designs are shown for a
specific infrared fiber-optic irradiation problem of practical interest.
Optical performance is checked with computer three-dimensional ray tracing.
Compared with conventional imaging solutions, nonimaging units offer
considerable practical advantages in compactness and ease of alignment as well
as noticeably superior radiative efficiency.
© 1997 Optical Society of America
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