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Title: Imprinting high-gradient topographical structures onto optical surfaces using magnetorheological finishing: Manufacturing corrective optical elements for high-power laser applications

Journal Article · · Applied Optics
DOI:https://doi.org/10.1364/AO.55.005240· OSTI ID:1297660
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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Corrective optical elements form an important part of high-precision optical systems. We have developed a method to manufacture high-gradient corrective optical elements for high-power laser systems using deterministic magnetorheological finishing (MRF) imprinting technology. Several process factors need to be considered for polishing ultraprecise topographical structures onto optical surfaces using MRF. They include proper selection of MRF removal function and wheel sizes, detailed MRF tool and interferometry alignment, and optimized MRF polishing schedules. Dependable interferometry also is a key factor in high-gradient component manufacture. A wavefront attenuating cell, which enables reliable measurement of gradients beyond what is attainable using conventional interferometry, is discussed. The results of MRF imprinting a 23 μm deep structure containing gradients over 1.6 μm / mm onto a fused-silica window are presented as an example of the technique’s capabilities. As a result, this high-gradient element serves as a thermal correction plate in the high-repetition-rate advanced petawatt laser system currently being built at Lawrence Livermore National Laboratory.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1297660
Alternate ID(s):
OSTI ID: 1259200
Report Number(s):
LLNL-JRNL-686928; APOPAI
Journal Information:
Applied Optics, Vol. 55, Issue 19; ISSN 0003-6935
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (10)

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conference June 2004
MRF applications: on the road to making large-aperture ultraviolet laser resistant continuous phase plates for high-power lasers
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conference October 2006
Developing magnetorheological finishing (MRF) technology for the manufacture of large-aperture optics in megajoule class laser systems conference November 2010
Large Optics for the National Ignition Facility journal February 2016
Review of the National Ignition Campaign 2009-2012 journal February 2014
Full System Operations of Mercury: A Diode Pumped Solid-State Laser journal April 2005
High Average Power Petawatt Laser Pumped by the Mercury Laser for Fusion Materials Engineering journal July 2009
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Power spectral density specifications for high-power laser systems conference August 1996

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