16 October 2012 Design and manufacture of high reflective coatings deposited on metal substrate
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Proceedings Volume 8416, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 84161G (2012); doi: 10.1117/12.977826
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China
Abstract
With increasing of the laser power, higher demand for high reflective thin films in cavity is needed. Higher reflectivity is beneficial to obtaining higher output power and reducing the heat from the cavity. The reflectivity of metal substrate itself is much higher, and much higher reflectivity can be obtained through depositing thin film. Due to good thermal conductivity of metal, the thin film deposition on metal substrate is usually used in high power laser system. Due to existing absorption, we must design proper film system structure and reduce the output heat from the laser cavity. Copper was used as substrate material. Optimizing the film system can reduce the absorption. High reflective coatings were deposited on copper substrate by ion beam sputtering. When the operating angles are from 10 to 35 degrees, the obtained reflectivity reaches over 99.5% at 941nm, and the reflective band is wide.
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Lishuan Wang, Huasong Liu, Yugang Jiang, Chenghui Jiang, Yiqin Ji, "Design and manufacture of high reflective coatings deposited on metal substrate", Proc. SPIE 8416, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 84161G (16 October 2012); doi: 10.1117/12.977826; http://dx.doi.org/10.1117/12.977826
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KEYWORDS
Reflectivity

Metals

Refractive index

Copper

Absorption

Silica

Thin films

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