Fabricated Lightweight Metal Optic Substrates

Larry A. Grant

doi:10.1117/12.956045

4 May 1978 Fabricated Lightweight Metal Optic Substrates

Larry A. Grant

Proceedings Volume 0131, Practical Infrared Optics; (1978) https://doi.org/10.1117/12.956045
Event: 1978 Los Angeles Technical Symposium, 1978, Los Angeles, United States

Abstract

Recently, by combining brazing technology with lightweight beryllium detail components, ultra-lightweight beryllium optic substrates have become available to the designer. Two basic approaches are discussed, in the paper which includes an "eggcrated" core technique where thin. beryllium sheet products are "photo-etched" into an eggcrated pattern. and metallurgically brazed to face plates. Details of core configuration, fabrication, brazing and tolerances that can be achieved, will be discussed. Actual hardware will be reviewed from 4" to 19" assemblies. Other applications involving machined. beryllium halves will be discussed. Various techniques of metal removal yielding an overall bulk density from 33% to 5%. Joining techniques to close out the hollowed. substrate are discussed. Applications from 6" to 36" diameter optics will be reviewed. Non-destructive inspection. techniques and extrapolations to larger substrHtes of both types of designs will be reviewed.

Citation Download Citation

Larry A. Grant "Fabricated Lightweight Metal Optic Substrates", Proc. SPIE 0131, Practical Infrared Optics, (4 May 1978); https://doi.org/10.1117/12.956045

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