High-Temperature Optical Transmission Of Transparent La203-Strengthened Y203

C Brecher; G C Wei; W H Rhodes

doi:10.1117/12.948120

17 January 1989 High-Temperature Optical Transmission Of Transparent La203-Strengthened Y203

C Brecher, G C Wei, W H Rhodes

Proceedings Volume 0968, Ceramics and Inorganic Crystals for Optics, Electro-Optics, and Nonlinear Conversion; (1989) https://doi.org/10.1117/12.948120
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

The optical transmission of transparent polycrystalline lanthana-strengthened yttria has been measured in both the near ultraviolet and infrared regions at temperatures between 20°C and 1400°C. The absorption remains extremely low until about 900°C, then rises almost exponentially as the temperature is raised further. The magnitude of the increase is a function of the oxygen partial pressure (P02) in the firing atmosphere. The absorption increase with temperature is smallest when Po2 is between 10-11 and 10-8 atm, representing the range in which the concentration of stoichiometry-related point defects (oxygen interstitials and vacancies) is minimized. The temperature dependence is significantly greater in the UV than in the IR, but the optimal Po2 range is the same. The absorption behavior is also a function of processing variations, and provides a good criterion for comparison of specimen quality.

Citation Download Citation

C Brecher, G C Wei, and W H Rhodes "High-Temperature Optical Transmission Of Transparent La203-Strengthened Y203", Proc. SPIE 0968, Ceramics and Inorganic Crystals for Optics, Electro-Optics, and Nonlinear Conversion, (17 January 1989); https://doi.org/10.1117/12.948120

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