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Absorption mapping for characterization of glass surfaces.

M Commandré, P Roche, J P Borgogno

|November 2, 2010

Summary

Surface absorption mapping reveals substrate contamination, crucial for optical coating performance. Highly polished surfaces and specific cleaning methods minimize residual absorption for better optical applications.

Area of Science:

Optical Engineering
Materials Science
Surface Science

Background:

Optical coating performance is highly dependent on the surface quality of bare substrates.
Conventional characterization methods often focus on roughness and local defects, potentially missing critical surface absorption information.
Surface absorption significantly impacts the performance and reliability of optical coatings.

Purpose of the Study:

To investigate the role of surface absorption in bare substrates for optical coating performance.
To evaluate the effectiveness of different substrate preparation techniques (cleaning and polishing) on surface absorption.
To compare the surface absorption characteristics of fused silica and multicomponent glass substrates.

Main Methods:

Utilized photothermal deflection technique for surface absorption mapping of fused-silica and glass substrates.

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Analyzed substrates prepared using various cleaning and polishing procedures.

Correlated surface absorption data with substrate preparation methods and material type.

Main Results:

Absorption mapping provides specific insights into surface contamination on bare substrates.
Highly polished surfaces exhibited the lowest residual surface absorption values.
Multicomponent glasses demonstrated different cleaning behaviors and optical performance (absorption) compared to fused silica.

Conclusions:

Surface absorption mapping is a valuable technique for assessing substrate quality for optical coatings.
Optimized polishing and cleaning procedures are essential for minimizing surface absorption and enhancing optical coating performance.
Material-specific differences in surface properties necessitate tailored preparation strategies for fused silica and multicomponent glasses.