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OPTICAL NOISE SUPPRESSION AND POWER ENHANCEMENT IN POSITIVE COLUMN LASERS USING MAGNETIC FIELDS

IP.com Disclosure Number: IPCOM000024138D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 392K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present invention utilizes magnets primarily to suppress optical noise in positive-column, helium-cadmium lasers. It is believed that the technique described could be utilized with other positive-column-type gas lasers although the noise mechanism (striation waves interacting with double sheaths) may in some

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XEROX DISCLOSURE JOURNAL

OPTICAL NOISE SUPPRESSION AND POWER ENHANCEMENT IN POSITIVE

COLUMN LASERS USING MAGNETIC FIELDS
~osephA~ Duardo

William F~Hug Robert M. Worlock

Proposed Classification

U~S.CL 331/94~5

Int. Cl. HOls 3/00

~8 j

FIG.

14

208

F/~ 18

210

~208

Volume 4 Number 5 September/October 1979 F-

[This page contains 1 picture or other non-text object]

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OPTICAL NOISE SUPPRESSION AND POWER ENHANCEMENT IN POSITIVE

COLUMN LASERS USING MAGNETIC FIELDS (Cont~d)

The present invention utilizes magnets primarily to suppress optical noise in positive-column, helium-cadmium lasers. It is believed that the technique described could be utilized with other positive-column-type gas lasers although the noise mechanism (striation waves interacting with double sheaths) may in some

cases not be necessarily operative in the same current and pressure ranges which the gas media require for efficient laser operation. The specific application of the magnets provides a localized, relatively high intensity magnetic field in the range

from about 250 gauss to about 800 gauss, the preferred range being from about 400 to about 600 gauss, in the region of the laser tube near the cathode end of the

discharge capillary bore 14 (Figures lA-IC) whereby the optical noise is suppressed as much as 10 to 50 times. The minimum value of the field required for noise

suppression may vary between 250 and 300 gauss whereas fields above 700 gauss tend to cause the laser to be noiser than without a magnet It has been observed that the output power of these lasers is enhanced from 10% to about 50% as the optical noise is suppressed. An arrangement of magnets mounted adjacent to or on the surface of the outer tube envelope 12 is provided, the figures illustrating the use of a pair of magnets 206 and 208 on the cathode end of t...