Browse Prior Art Database

Transverse Mode Control in Giant Pulse Lasers

IP.com Disclosure Number: IPCOM000080241D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Lo, HM: AUTHOR

Abstract

A means is described for suppressing high-order transverse modes in a giant pulse laser.

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Transverse Mode Control in Giant Pulse Lasers

A means is described for suppressing high-order transverse modes in a giant pulse laser.

The figure shows a laser cavity formed by the laser medium 1, the planar output reflector 2, and the planar total reflector 3. Inserted within the cavity thus formed, in front of the total reflector 3, is a saturable absorber Q-switching dye in the shape of a plano-concave optical element 4. The Q-switching dye is of the type disclosed in U. S. Patent 3,668,420, which may be dissolved in a liquid solution or a plastic matrix. The dye element 4 has a continuous surface contour, with a minimum thickness on the optical axis of the laser cavity and a maximum thickness at the cylindrical periphery.

It is well known, that the TEMoo mode occupies the central region of the laser cavity along the optical axis 5 and that higher order modes occupy more peripheral regions therein. Because the Q-switch 4 is thinner along the laser axis 5, the TEMoo mode will reach its saturation threshold in the absorbing medium of the Q-switch 4, before the higher order modes can reach their saturation threshold in the thicker, peripheral portions of the Q-switch 4. Thus, the TEMoo mode will commence laser action to the exclusion of higher order modes in the cavity.

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