Authors

D. C. Harris; L. F. Johnson; R. Seaver; T. Lewis; G. Turri; M. Bass; D. E. Zelmon;N. D. Haynes

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

spinel; sapphire; magnesium aluminum spinel; laser calorimetry; infrared; absorption; refractive index; thermal conductivity; thermal expansion; heat capacity; infrared window design; WEIBULL STATISTICAL-ANALYSIS; SYNTHETIC SAPPHIRE; REFRACTIVE-INDEX; WINDOW MATERIALS; TEMPERATURE; STRENGTH; MGAL2O4; RAY; CALORIMETRY; COEFFICIENT; Optics

Abstract

Infrared absorption of high-quality, commercial, polycrystalline MgAl2O4 spinel is similar to 40% greater in the range of 3.8 to 5.0 mu m than the value predicted by the computer code OPTIMATR (R), which has been used for window and dome design for more than 20 years. As a result, spinel and a-plane sapphire windows designed to support the same external pressure with the same probability of survival have approximately the same infrared absorptance in the range 3.8 to 5.0 mu m. c-Plane sapphire has greater absorptance than spinel in the range 3.8 to 5.0 mu m. Spinel has two weak absorption bands near 1.8 and 3.0 mu m. At 1.064 mu m, the laser calorimetric absorption coefficient of spinel is 10 to 50 times greater than that of sapphire. New measurements of specific heat capacity, thermal expansion, thermal conductivity, elastic constants, and refractive index (including dn/dT) of spinel are reported. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

Journal Title

Optical Engineering

Volume

52

Issue/Number

8

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

12

WOS Identifier

WOS:000324290900050

ISSN

0091-3286

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