Share Email Print
cover

Proceedings Paper

High-precision measurements of the 24-beam UV-OMEGA laser
Author(s): Paul A. Jaanimagi; C. Hestdalen; John H. Kelly; Wolf D. Seka
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The achievement of high density implosions of direct-drive laser fusion targets with the 24-beam TJV-OMEGA laser system places very stringent requirements on the irradiation uniformity on target. Non-uniformities in the irradiation pattern must not exceed -1% mis. One of the prerequisites for establishing the level of uniformity attained is the very precise measurement of the laser power balance. This entails that the laser power in each of the 24 beamlines be diagnosed simultaneously with a precision of 1%, over a dynamic range of 1000. The nominal laser pulse shape is a 600-ps FWHM Gaussian, but this can vary between individual beamlines due to beam-to-beam differences in the nonlinear processes of frequency conversion or gain saturation in the laser amplifiers. We have set up a pulse-shape measurement system in which we pick off a small fraction of the energy in each OMEGA beamline, linearly attenuate it, and couple the light into a multi-mode optical fiber for transport to a 24-channel streak camera. The signals are multiplexed in 2 groups of 12 beams each. The streak-camera output is amplified with a dual intensifier system and recorded on a photometric quality, cooled CCD camera. In this paper, we will report on the system performance and progress to date.

Paper Details

Date Published: 1 April 1991
PDF: 7 pages
Proc. SPIE 1358, 19th Intl Congress on High-Speed Photography and Photonics, (1 April 1991); doi: 10.1117/12.24040
Show Author Affiliations
Paul A. Jaanimagi, Lab. for Laser Energetics/Univ. of Rochester (United States)
C. Hestdalen, Lab. for Laser Energetics/Univ. of Rochester (United States)
John H. Kelly, Lab. for Laser Energetics/Univ. of Rochester (United States)
Wolf D. Seka, Lab. for Laser Energetics/Univ. of Rochester (United States)


Published in SPIE Proceedings Vol. 1358:
19th Intl Congress on High-Speed Photography and Photonics
Peter W. W. Fuller, Editor(s)

© SPIE. Terms of Use
Back to Top