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26 September 1978 Transmission And Reflection Measurements Of Large Optical Components For High-Power Lasers
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Proceedings Volume 0140, Optical Coatings: Applications and Utilization II; (1978)
Event: 1978 Technical Symposium East, 1978, Washington, D.C., United States
A special instrument has been built for precision measurement of reflection and trans-mission of large optical components for high power lasers. These optical components are much too large to be measured in ordinary spectrophotometers normally used for this purpose. The coatings on such large components have traditionally been evaluated from measurements performed on smaller witness parts coated along side the large parts. Mea-surements performed directly on the large parts eliminate the uncertainty associated with reliance on witness parts. The instrument is designed to handle optical components as large as 500mm x 500mm up to 100mm thick and weighing over 50kg. The whole clear aperture of the part can be scanned and variations in the coating or substrate performance within the aperture are mapped on a graph produced by an x-y recorder connected to the instrument. Reflection and transmission can be measured at incidence angles up to 60° with either S or P polarization. Double bounce or double pass are used with high values for R or T. The measurement accuracy is ± .05% or better for high or low values of R and T. Coating bire-fringence can also be measured by using an orientation of polarization 45° from P or S. Birefringence as low as 2° can be measured.
© (1978) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Erik Anthon "Transmission And Reflection Measurements Of Large Optical Components For High-Power Lasers", Proc. SPIE 0140, Optical Coatings: Applications and Utilization II, (26 September 1978);

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