Browse Prior Art Database

Sealed Helium Neon Laser

IP.com Disclosure Number: IPCOM000080218D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Klauser, HE: AUTHOR

Abstract

This is a method which enables rhe mirrors of a sealed helium-neon laser to be precisely aligned after adequate bakeout.

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Sealed Helium Neon Laser

This is a method which enables rhe mirrors of a sealed helium-neon laser to be precisely aligned after adequate bakeout.

Glass or ceramic bonded mirrors which permit bakeout and thereby long life of the laser do not allow for precision alignment of the mirrors. Alignment achieved prior to bakeout is lost as internal stresses are relieved during bakeout. The mirrors must be mounted on a sturdy frame and sealed reliably to the rigid glass to seal off the gas envelope.

Precision alignment after bakeout can be achieved by providing a ductile but bakeable section in the glass structure that supports the two end mirrors. The mirrors are aligned prior to bakeout. The minor but critical misalignment that occurs during bakeout can be corrected after the end of the bakeout cycle, by permanently deforming the ductile portion of the gas envelope. This is achieved by temporarily applying a deforming force against the ductile tube portion, while the device is retained in a suitable jig. Small relative angular motions between the mirrors can be effected while glow discharge through the glass tube is maintained and laser output is adjusted for peak performance. The amount and direction of the corrective deformation can be predetermined (after bakeout) by observing the light spot of another laser or an autocollimator, as reflected from the mirrors.

The asyrmetrical device shown in Fig. 1 comprises a tube 1 of ductile metal joined by annular glass-to-metal...