Development Of IR Graded Index Elements

A. Bornstein; T. Tsalach; E. Elyasaf; Y. Atiya

doi:10.1117/12.941812

10 November 1987 Development Of IR Graded Index Elements

A. Bornstein, T. Tsalach, E. Elyasaf, Y. Atiya

Proceedings Volume 0819, Infrared Technology XIII; (1987) https://doi.org/10.1117/12.941812
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

Graded Index material (GRIN) is presently being used as a flexible means of problem solving in special visual optics applications. For the optical designer GRIN serves as a novel additional design parameter whose actual employment is limited only by the ability to produce the required index profile. The most widely used commercially available GRIN material for the visible region is known under the name of selfoc, a proprietary process of a Japanese firm. The high cost of IR transmitting materials and the complex process of aspheric element fabrication suggest that IR GRIN be used as a flexible and cheaper implementation alternative. So far, nothing but theoretical work has been carried out concerning the use of GRIN elements in the IR region. To facilitate GRIN elements, three basic capabilities are required: GRIN fabrication Index profile measurement Utilization of GRIN in the optical design An original method for the fabrication of graded index elements from IR transmitting chalcogenide glasses of different compositions has been developed. The preparation method and some application of IR GRIN glasses are presented. A sample IR system employing GRIN element will be presented as well. There should be few words on the glass employed. The compositions and profiles were measured by the EDAX technique, radioactive tracing and optical methods. The diffusion parameters were calculated for Se in As2Se3 glass and are the following: Diffusion coefficient Do = 3.65 10-6cm2/sec. Activation energy Q = 3.95 k.cal/mol degree. The results will be discussed.

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A. Bornstein, T. Tsalach, E. Elyasaf, and Y. Atiya "Development Of IR Graded Index Elements", Proc. SPIE 0819, Infrared Technology XIII, (10 November 1987); https://doi.org/10.1117/12.941812

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KEYWORDS

GRIN lenses

Diffusion

Glasses

Aspheric lenses

Refractive index

Selenium

Ions

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