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This content will become publicly available on May 18, 2017

Title: Direct optical measurement of the on-shot incoherent focal spot and intensity contrast on the OMEGA EP laser

Characterizing the prepulse temporal contrast of optical pulses is required to understand their interaction with matter. Light with relatively low intensity can interact with the target before the main high-intensity pulse. Estimating the intensity contrast, instead of the spatially averaged power contrast, is important to understand intensity-dependent laser–matter interactions. A direct optical approach to determining the on-shot intensity of the incoherent pedestal on an aberrated high-intensity laser system is presented. The spatially resolved focal spot of the incoherent pedestal preceding the main coherent pulse and the intensity contrast are calculated using experimental data. Furthermore, this technique is experimentally validated on one of the chirped pulse amplification beamlines of the OMEGA EP Laser System. The intensity contrast of a 1-kJ, 10-ps laser pulse is shown to be ~10× higher than the power contrast because of the larger spatial extent of the incoherent focal spot relative to the coherent focal spot.
Authors:
 [1] ;  [1] ;  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
OSTI Identifier:
1255540
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Applied Physics. B, Lasers and Optics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 6; Journal ID: ISSN 0946-2171
Publisher:
Springer
Research Org:
Univ. of Rochester, Rochester, NY (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
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