Browse Prior Art Database

Focusing Assembly for Optical Fiber

IP.com Disclosure Number: IPCOM000062625D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Hussey, BW: AUTHOR

Abstract

Near-diffraction limited spot sizes of focused laser light can be obtained over a wide range of distances by rigidly fixing an adjustable, hand-size, interchangeable lens assembly to an optical fiber. In the figure, mounting collar 1 has straight bore 2 terminating with tapered bore 3 into which is wedged spherical lens 4. Lens 4 is well-suited for collimating the output light from a fiber, and the fiber end can be inserted close to the lens. Glass tubing 5 is secured in bore 2 and retains lens 4 while carrying optical fiber 6 within its precision bore 7. A strain relief clamp 8 for fiber 6 attaches to both tubing 5 and the fiber and is adjusted to vary the distance between the fiber end and lens 4. Mounting collar 1 has secured thereto by set screw an inner sleeve 9 having a helical slot 10 in its wall.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

Focusing Assembly for Optical Fiber

Near-diffraction limited spot sizes of focused laser light can be obtained over a wide range of distances by rigidly fixing an adjustable, hand-size, interchangeable lens assembly to an optical fiber. In the figure, mounting collar 1 has straight bore 2 terminating with tapered bore 3 into which is wedged spherical lens 4. Lens 4 is well-suited for collimating the output light from a fiber, and the fiber end can be inserted close to the lens. Glass tubing 5 is secured in bore 2 and retains lens 4 while carrying optical fiber 6 within its precision bore 7. A strain relief clamp 8 for fiber 6 attaches to both tubing 5 and the fiber and is adjusted to vary the distance between the fiber end and lens 4. Mounting collar 1 has secured thereto by set screw an inner sleeve 9 having a helical slot 10 in its wall. A concentric outer sleeve 11 is rotatable about inner sleeve 9 and carries straight longitudinal slot 12. Lens holder 13 with lens 14 is fitted with a dowel 15 extending through both slots 10 and 12. As outer sleeve 11 rotates, lens holder 13 with lens 14 can be moved axially of inner sleeve 9 to adjust the focal point of lens 14. Lens 14 is preferably plano-convex with an anti-reflective coating and depends critically on having light output from spherical lens 4 collimated to achieve a variable working distance. Collar 1, sleeves 9 and 11 and lens holder 13 are preferably of aluminum anodized black to minimize stray reflectanc...