High performance fluoride optical coatings for DUV optics

Lichao Zhang; Xikun Cai

doi:10.1117/12.2068115

6 August 2014 High performance fluoride optical coatings for DUV optics

Lichao Zhang, Xikun Cai

Proceedings Volume 9281, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 92810A (2014) https://doi.org/10.1117/12.2068115
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

In deep ultraviolet region that typical applications are used on the ArF wavelength, coated optics should meet stringent requirements of optical systems. To meet these requirements, systematical researches are carried out on fabrication and characterization methods of fluoride coatings. First, by optimizing of deposition processes, dense coatings with the refractive index of ~1.7 for LaF₃ and ~1.4 for MgF₂, together with extinction coefficients of ~2×10^-4 on 193nm were realized. The transmission of AR coating for 193nm achieved by using optimized deposition techniques is 99.8%. Second, a method of designing shadowing masks was developed to solve the problem of correcting coating thickness distributions for complex DUV systems. By using the method, the thickness distribution error specification of 3% PV has been achieved on substrates with ~300mm diameters and large curvatures. Finally, the laser calorimetry method is used to evaluate the laser radiation stability of fluoride coatings. It is turned out that the damage coefficients of fluoride coatings, which are defined as the values of unrecoverable increase of the absorption during the laser irradiation process, are much lower than that of fused silica substrates. The above progresses could further support the realization of high performance DUV optical systems.

Citation Download Citation

Lichao Zhang and Xikun Cai "High performance fluoride optical coatings for DUV optics", Proc. SPIE 9281, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 92810A (6 August 2014); https://doi.org/10.1117/12.2068115

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KEYWORDS

Optical coatings

Absorption

Deep ultraviolet

Thin film coatings

Antireflective coatings

Magnesium fluoride

Silica

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