A Programmable Beam Shaping System for Tailoring the Profile of High Fluence Laser Beams

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Description

Customized spatial light modulators have been designed and fabricated for use as precision beam shaping devices in fusion class laser systems. By inserting this device in a low-fluence relay plane upstream of the amplifier chain, 'blocker' obscurations can be programmed into the beam profile to shadow small isolated flaws on downstream optical components that might otherwise limit the system operating energy. In this two stage system, 1920 x 1080 bitmap images are first imprinted on incoherent, 470 nm address beams via pixilated liquid crystal on silicon (LCoS) modulators. To realize defined masking functions with smooth apodized shapes and no pixelization ... continued below

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7 p. (0.4 MB)

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Heebner, J; Borden, M; Miller, P; Stolz, C; Suratwala, T; Wegner, P et al. November 10, 2010.

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Description

Customized spatial light modulators have been designed and fabricated for use as precision beam shaping devices in fusion class laser systems. By inserting this device in a low-fluence relay plane upstream of the amplifier chain, 'blocker' obscurations can be programmed into the beam profile to shadow small isolated flaws on downstream optical components that might otherwise limit the system operating energy. In this two stage system, 1920 x 1080 bitmap images are first imprinted on incoherent, 470 nm address beams via pixilated liquid crystal on silicon (LCoS) modulators. To realize defined masking functions with smooth apodized shapes and no pixelization artifacts, address beam images are projected onto custom fabricated optically-addressable light valves. Each valve consists of a large, single pixel liquid cell in series with a photoconductive Bismuth silicon Oxide (BSO) crystal. The BSO crystal enables bright and dark regions of the address image to locally control the voltage supplied to the liquid crystal layer which in turn modulates the amplitude of the coherent beams at 1053 nm. Valves as large as 24 mm x 36 mm have been fabricated with low wavefront distortion (<0.5 waves) and antireflection coatings for high transmission (>90%) and etalon suppression to avoid spectral and temporal ripple. This device in combination with a flaw inspection system and optic registration strategy represents a new approach for extending the operational lifetime of high fluence laser optics.

Physical Description

7 p. (0.4 MB)

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PDF-file: 7 pages; size: 0.4 Mbytes

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  • Presented at: 2010 Boulder Conference, Boulder, CO, United States, Sep 26 - Sep 29, 2010

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  • Report No.: LLNL-PROC-462911
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1016923
  • Archival Resource Key: ark:/67531/metadc847153

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  • November 10, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • April 17, 2017, 1:06 p.m.

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Heebner, J; Borden, M; Miller, P; Stolz, C; Suratwala, T; Wegner, P et al. A Programmable Beam Shaping System for Tailoring the Profile of High Fluence Laser Beams, article, November 10, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc847153/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.