2-1/2-D electromagnetic modeling of nodular defects in high-power multilayer optical coatings

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Advances in the design and production of high damage threshold optical coatings for use in mirrors and polarizers have been driven by the design requirements of high-power laser systems such as the proposed 1.8-MJ National Ignition Facility (NIF) and the prototype 12- kJ Beamlet laser system. The present design of the NIF will include 192 polarizers and more than 1100 mirrors. Currently, the material system of choice for high-power multilayer optical coatings with high damage threshold applications near 1.06 {mu}m are e-beam deposited HfO{sub 2}/Si0{sub 2} coatings. However, the optical performance and laser damage thresholds of these coatings are limited ... continued below

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32 p.

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Molau, N. E.; Brand, H. R.; Kozlowski, M. R. & Shang, C. C. July 1996.

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Description

Advances in the design and production of high damage threshold optical coatings for use in mirrors and polarizers have been driven by the design requirements of high-power laser systems such as the proposed 1.8-MJ National Ignition Facility (NIF) and the prototype 12- kJ Beamlet laser system. The present design of the NIF will include 192 polarizers and more than 1100 mirrors. Currently, the material system of choice for high-power multilayer optical coatings with high damage threshold applications near 1.06 {mu}m are e-beam deposited HfO{sub 2}/Si0{sub 2} coatings. However, the optical performance and laser damage thresholds of these coatings are limited by micron-scale defects and insufficient control over layer thickness. In this report, we will discuss the results of our 2-1/2-D finite-element time- domain (FDTD) EM modeling effort for rotationally-symmetric nodular defects in multilayer dielectric HR coatings. We have added a new diagnostic to the 2-1/2-D FDTD EM code, AMOS, that enables us to calculate the peak steady-state electric fields throughout a 2-D planar region containing a 2-D r-z cross-section of the axisymmetric nodular defect and surrounding multilayer dielectric stack. We have also generated a series of design curves to identify the range of loss tangents for Si0{sub 2} and HfO{sub 2} consistent with the experimentally determined power loss of the HR coatings. In addition, we have developed several methods to provide coupling between the EM results and the thermal-mechanical simulation effort.

Physical Description

32 p.

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OSTI as DE96050550

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  • Other Information: PBD: Jul 1996

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  • Other: DE96050550
  • Report No.: UCRL-ID--124808
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/392718 | External Link
  • Office of Scientific & Technical Information Report Number: 392718
  • Archival Resource Key: ark:/67531/metadc684881

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 16, 2016, 1:28 p.m.

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Molau, N. E.; Brand, H. R.; Kozlowski, M. R. & Shang, C. C. 2-1/2-D electromagnetic modeling of nodular defects in high-power multilayer optical coatings, report, July 1996; California. (digital.library.unt.edu/ark:/67531/metadc684881/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.