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Proceedings Paper

The multiple-pulse driver line on the OMEGA laser
Author(s): T. Z. Kosc; J. H. Kelly; E. M. Hill; C. Dorrer; L. J. Waxer; W. R. Donaldson
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Paper Abstract

The multiple-pulse driver line (MPD) provides on-shot co-propagation of two separate pulse shapes in all 60 OMEGA beams at the Laboratory for Laser Energetics (LLE). The two co-propagating pulse shapes would typically be (1) a series of 100-ps “picket” pulses followed by (2) a longer square or shaped “drive” pulse. Smoothing by spectral dispersion (SSD), which increases the laser bandwidth, can be applied to either one of the two pulse shapes. Therefore, MPD allows for dynamic bandwidth reduction, where the bandwidth is applied only to the picket portion of a pulse shape. Since the use of SSD decreases the efficiency of frequency conversion from the IR to the UV, dynamic bandwidth reduction provides an increase in the drive-pulse energy. The design of the MPD required careful consideration of beam combination as well as the minimum pulse separation for two pulses generated by two separate sources. A new combined-pulse-shape diagnostic needed to be designed and installed after the last grating used for SSD. This new driver-line flexibility is built into the OMEGA front end as one component of the initiative to mitigate cross-beam energy transfer on target and to demonstrate hydro-equivalent ignition on the OMEGA laser at LLE.

Paper Details

Date Published: 26 February 2015
PDF: 7 pages
Proc. SPIE 9345, High Power Lasers for Fusion Research III, 93450H (26 February 2015); doi: 10.1117/12.2079925
Show Author Affiliations
T. Z. Kosc, Univ. of Rochester (United States)
J. H. Kelly, Univ. of Rochester (United States)
E. M. Hill, Univ. of Rochester (United States)
C. Dorrer, Univ. of Rochester (United States)
L. J. Waxer, Univ. of Rochester (United States)
W. R. Donaldson, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 9345:
High Power Lasers for Fusion Research III
Abdul A. S. Awwal; Monya A. Lane, Editor(s)

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