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Single-shot, phase-diversity phase retrieval for high-energy beam focal-spot diagnostics

Journal Article · · Journal of the Optical Society of America. Part B, Optical Physics
DOI:https://doi.org/10.1364/josab.498218· OSTI ID:2205584
 [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. University of Rochester, NY (United States); Laboratory for Laser Energetics, University of Rochester
  2. University of Rochester, NY (United States)
+ Show Author Affiliations
A single-shot, phase-diversity phase-retrieval method is demonstrated for directly characterizing the on-target focal spot at kilojoule energy in the OMEGA 60-beam laser. A 2D holographic grating that introduces diversity focal spots is installed in an existing on-target focal-spot diagnostic to obtain a single-shot diversity focal-spot image. A nonlinear optimization phase-retrieval algorithm with four diversity focal spots is employed to determine modal coefficients for the incident wavefront. The agreement between the measured and calculated focal spots is excellent. Furthermore, this approach can be easily adapted for other high-energy focal-spot diagnostics.
Research Organization:
University of Rochester, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003856
OSTI ID:
2205584
Alternate ID(s):
OSTI ID: 2203468
Journal Information:
Journal of the Optical Society of America. Part B, Optical Physics, Journal Name: Journal of the Optical Society of America. Part B, Optical Physics Journal Issue: 11 Vol. 40; ISSN 0740-3224
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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