Fiber lens for use with a confocal lens system

Details Fiber lens for use with a confocal lens system Fiber lens for use with a confocal lens system

1998-03-06

1999-08-31

Epps, Georgia

Optical: systems and elements

Collimating of light beam

359710, G02B 2730, G02B 306

Patent

active

059461403

ABSTRACT:
A lens system for use with elliptical optical sources includes a spherical fiber lens disposed beyond a conventional confocal lens arrangement. The spherical fiber lens is disposed in the optical path at the point where the slow axis (X ray) crosses the fast axis (Y ray); the rays will be "circular" and will thereafter propagate as a circular wavefront. The coupling efficiency of such a system is thus improved from approximately 40% to over 80%. The radius of the spherical endface of the fiber lens may be adjusted to improve the coupling efficiency. The spherical fiber lens is easily formed by fusing a section of "coreless" silica fiber onto the endface of a conventional single mode fiber. The end of the silica fiber is thereafter prepared (by heating, etching, polishing, or laser machining, for example) to provide a spherical endface with the desired radius.

REFERENCES:
patent: 5181224 (1993-01-01), Snyder

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