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The Formation And Development Of Nodular Defects In Optical Coatings
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Book Synopsis The Formation and Development of Nodular Defects in Optical Coatings by : B. Liao
Download or read book The Formation and Development of Nodular Defects in Optical Coatings written by B. Liao and published by . This book was released on 1988 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have investigated the nodular defect using computer simulations and experimental techniques. A modified version of the hard-disk model, in which the migration and attraction of atoms are introduced in simplified ways, is used to simulate the formation and development of nodules. This simulation reveals the self-extending nature of nodule growth and the dependence of the nodule shape and size upon the conditions of the coating's formation, including deposition geometry, migration, and capture length of atoms. By planting artificial seeds on substrate surfaces and overcoating with single and multilayer stacks, we have encourged nodular formation under controlled and variable deposition conditions. Fractured cross-sections of these coatings have been examined by scanning microscopy (SEM). A comparison between our experimental observations and the modeling results help explain the mechanisms for nodule growth.
Book Synopsis Laser Induced Damage in Optical material: 1985 by :
Download or read book Laser Induced Damage in Optical material: 1985 written by and published by ASTM International. This book was released on with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Damage in Optical Materials by :
Download or read book Laser Induced Damage in Optical Materials written by and published by . This book was released on 1989 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Damage in Optical Materials, 1985 by :
Download or read book Laser Induced Damage in Optical Materials, 1985 written by and published by . This book was released on 1988 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Defect Geometries in Multilayer Optical Coatings by :
Download or read book Characterization of Defect Geometries in Multilayer Optical Coatings written by and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced damage in optical coatings is generally associated with micrometer-scale defects. A simple geometric model for nodule-shaped defects is commonly used to describe defects in optical coatings. No systematic study has been done, however, to prove the applicability of that model to standard optical coating deposition. Some defects are known not to have a classic nodule geometry. The present study uses atomic force microscopy (AFM) and scanning electron microscopy to characterize the topography of coating defects in a HfO2/SiO2 multilayer mirror system. Focused ion-beam cross-sectioning is then used to study the underlying defect structure. This work develops a model for defect shape such that the overall geometry of a coating defect, particularly seed size and depth, can be inferred from non-destructive evaluation measurements such as AFM. The relative mechanical stabilities of nodular defects can be deduced based on the nodule's geometry. Auger analysis showed that the seed material that causes nodular defects in HfO2/SiO2 multilayers is a hafnia oxide. Such characterization capabilities are needed for understanding the enhanced susceptibility of particular defects to laser damage and for developing improved techniques for depositing low-defect density coatings.
Book Synopsis 2−12-D Electromagnetic Modeling of Nodular Defects in High-power Multilayer Optical Coatings by :
Download or read book 2−12-D Electromagnetic Modeling of Nodular Defects in High-power Multilayer Optical Coatings written by and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 HfO2/Si02 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 Si02 and HfO2 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.
Book Synopsis Laser Induced Damage in Optical Materials: by : Arthur H. Guenther
Download or read book Laser Induced Damage in Optical Materials: written by Arthur H. Guenther and published by ASTM International. This book was released on 1977 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Damage in Optical Materials, 1989 by : Harold Earl Bennett
Download or read book Laser Induced Damage in Optical Materials, 1989 written by Harold Earl Bennett and published by . This book was released on 1990 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Damage in Optical Materials: 1989 by : Alexander J. Glass
Download or read book Laser Induced Damage in Optical Materials: 1989 written by Alexander J. Glass and published by ASTM International. This book was released on 1978 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 2-1/2-D Electromagnetic Modeling of Nodular Defects in High-power Multilayer Optical Coatings by :
Download or read book 2-1/2-D Electromagnetic Modeling of Nodular Defects in High-power Multilayer Optical Coatings written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author :Metin S. Mangir Publisher :SPIE-International Society for Optical Engineering ISBN 13 : Total Pages :192 pages Book Rating :4.3/5 (91 download)
Book Synopsis Nonlinear Optical Engineering by : Metin S. Mangir
Download or read book Nonlinear Optical Engineering written by Metin S. Mangir and published by SPIE-International Society for Optical Engineering. This book was released on 1998 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Optical Thin Films by : Michael Ray Jacobson
Download or read book Modeling of Optical Thin Films written by Michael Ray Jacobson and published by . This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Nodular and Thermal Defects in Hafnia by :
Download or read book Characterization of Nodular and Thermal Defects in Hafnia written by and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multilayer coatings manufactured from metallic hafnium and silica sources by reactive electron beam deposition, are being developed for high fluence optics in a fusion laser with a wavelength of 1053 nm and a 3 ns pulse length. Damage threshold studies have revealed a correlation between laser damage and nodular defects, but interestingly laser damage is also present in nodule-free regions. Photothermal studies of optical coatings reveal the existence of defects with strong optical absorption in nodule-free regions of the coating. A variety of microscopic techniques were employed to characterize the effects for a better understanding of the thermal properties of nodular defects and role of thermal defects in laser damage. Photothermal microscopy, utilizing the surface thermal lensing technique, was used to map the thermal characteristics of 3 mm x 3 mm areas of the coatings. High resolution subaperture scans, with a 1 pm step size and a 3 um pump beam diameter, W= conducted on the defects to characterize their photothermal properties. Optical and atomic force microscopy was used to visually identify defects and characterize their topography. The defects were then irradiated to determine the role of nodular and thermal defects in limiting the damage threshold of the multilayer.
Book Synopsis Selected Papers on Deposition of Optical Coatings by : Michael Ray Jacobson
Download or read book Selected Papers on Deposition of Optical Coatings written by Michael Ray Jacobson and published by . This book was released on 1989 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scanning Microscopy Instrumentation by : Gordon S. Kino
Download or read book Scanning Microscopy Instrumentation written by Gordon S. Kino and published by . This book was released on 1992 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coatings on Glass written by H. Pulker and published by Elsevier. This book was released on 1999-03-29 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second, revised edition of a book that has already proved invaluable to a wide range of readers. Written by a scientist for scientists and technical people, it goes beyond the subject matter indicated by the title, filling the gap which previously existed in the available technical literature. It includes a wealth of information for physicists, chemists and engineers who need to know more about thin films for research purposes, or who want to use this special form of solid material to achieve a variety of application-oriented goals.
