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Browse Prior Art Database

Mounting Unit for Laser Cavity

IP.com Disclosure Number: IPCOM000091540D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Habegger, MA: AUTHOR

Abstract

When optical material is inserted in an oscillating laser cavity, a prime consideration is the reduction of optical losses. Usually a refractive index matching oil is used to reduce reflection losses. When used in the laser cavity, the oil introduces many scattering centers into the laser beam increasing the optical losses. This mounting unit reduces the optical pathlength in the oil to an absolute minimum and maintains the axial angular alignment of the optical element.

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Mounting Unit for Laser Cavity

When optical material is inserted in an oscillating laser cavity, a prime consideration is the reduction of optical losses. Usually a refractive index matching oil is used to reduce reflection losses. When used in the laser cavity, the oil introduces many scattering centers into the laser beam increasing the optical losses. This mounting unit reduces the optical pathlength in the oil to an absolute minimum and maintains the axial angular alignment of the optical element.

Laser cavity 1 contains laser elements 2...4 immersed in oil 5. Brewster angle windows 6 and 7 are disposed at opposite ends of cavity 1. Windows 6 and 7 are cylindrical prisms fabricated from an optical material of high homogeneity. Oil 5 is placed on each of the polished surfaces and optical elements 2...7 are pushed together. A thin film of oil remains between the elements. The alignment of the elements is maintained by the polished surfaces of each element being maintained in a parallel position to the others.

To mount the optical elements in this position windows 6 and 7 are each positioned in holding mounts 8 and 9. The latter are cylindrical in shape, having O-ring seals 10, 12 and 11, 13 positioned respectively between the mount and the cavity, and the window and the mount. The O-ring seals prevent leakage of the refractive index matching oil. Abutment of the elements in cavity 1 is obtained by spring-loading mounts 8 and 9 in cavity 1 by the springs 14 and...