10 December 2001 Measurement of absorptance of optical coatings for F2 lithography
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An absorptance measurement system has been developed for evaluation of the absorption loss of optical coatings at the wavelength of F2 laser(157nm). Calorimetry was adopted as measurement method because of its high reliability. In the system, the calorific values generated by irradiation has estimated by comparison with those generated by an electric heater in order to obtain the high accuracy of measurement. The repeatability of measurement has been attained so far to be +/- 0.02%. We have found out with the system that the absorptance is increased by measurement in the vacuum compared with in nitrogen and decreased by irradiation of F2 laser light due to its contamination cleaning effect. We have measured the absorptance of samples with anti-reflection coatings that several suppliers fabricated by their own methods.
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Chidane Ouchi, Chidane Ouchi, Masanobu Hasegawa, Masanobu Hasegawa, Akira Matsumoto, Akira Matsumoto, Kazuho Sone, Kazuho Sone, } "Measurement of absorptance of optical coatings for F2 lithography", Proc. SPIE 4449, Optical Metrology Roadmap for the Semiconductor, Optical, and Data Storage Industries II, (10 December 2001); doi: 10.1117/12.450089; https://doi.org/10.1117/12.450089

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