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Immersion Lens Assembly for Diode Laser

IP.com Disclosure Number: IPCOM000044745D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Fortenberry, RS: AUTHOR

Abstract

This article describes an immersion lens assembly for collimating the output of a diode laser. The assembly employs aplanatic geometry. The diode laser is immersed in a non-degrading liquid. Two variations are described, one of which uses a conventional convex lens to complete the collimation process.

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Immersion Lens Assembly for Diode Laser

This article describes an immersion lens assembly for collimating the output of a diode laser. The assembly employs aplanatic geometry. The diode laser is immersed in a non-degrading liquid. Two variations are described, one of which uses a conventional convex lens to complete the collimation process.

Referring to Fig. 1, a diode laser 10 is mounted with its active junction immersed in a chamber 12 filled with a non- degrading, non-conductive liquid having an index of refraction N1. A plastic lens 14 forms one wall of the chamber
12. Lens 14 has an index of refraction N2. The central portion of the lens 14 has a spherical configuration. A conventional convex lens 16 is mounted in a frame 18 on the output side of the lens 14.

In this lens assembly, the index of refraction N1 of the fluid in chamber 12 matches the index of refraction N2 for the lens 14. Collimation of the initially- diverging laser beam requires both lens 14 and lens 16.

Referring to Fig. 2, a similar but simpler lens assembly is shown. The diode laser 20 has its active junction immersed in a liquid filled chamber 22, one wall of which is formed by the spherical lens 24. In this lens assembly, the index of refraction N1 of the fluid in chamber 22 is greater than the index of refraction N2 of the lens 24. Given these conditions, the lens 24 provides the necessary collimating power.

The lenses 14 and 24, respectively, can be molded to convert a diode laser's no...