Dr. Lichao Zhang Profile

Dr. Lichao Zhang

at Changchun Institute of Optics, Fine Mech. & Phys.

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Proceedings Article | 6 August 2014 Paper

High performance fluoride optical coatings for DUV optics

Lichao Zhang, Xikun Cai

Proceedings Volume 9281, 92810A (2014) https://doi.org/10.1117/12.2068115

KEYWORDS: Optical coatings, Absorption, Deep ultraviolet, Thin film coatings, Antireflective coatings, Magnesium fluoride, Silica, Refractive index, Laser stabilization, Thin films

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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.

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