Recent progress of EUV wavefront metrology in EUVA

Masanobu Hasegawa; Chidane Ouchi; Takayuki Hasegawa; Seima Kato; Akinori Ohkubo; Akiyoshi Suzuki; Katsumi Sugisaki; Masashi Okada; Katsura Otaki; Katsuhiko Murakami; Jun Saito; Masahito Niibe; Mitsuo Takeda

doi:10.1117/12.562431

18 October 2004 Recent progress of EUV wavefront metrology in EUVA

Masanobu Hasegawa, Chidane Ouchi, Takayuki Hasegawa, Seima Kato, Akinori Ohkubo, Akiyoshi Suzuki, Katsumi Sugisaki, Masashi Okada, Katsura Otaki, Katsuhiko Murakami, Jun Saito, Masahito Niibe, Mitsuo Takeda

Author Affiliations +

Proceedings Volume 5533, Advances in Mirror Technology for X-Ray, EUV Lithography, Laser, and Other Applications II; (2004) https://doi.org/10.1117/12.562431
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The recent experimental results of EUV wavefront metrology in EUVA are reported. EUV Experimental Interferometer (EEI) was built at the NewSUBARU synchrotron facility of University of Hyogo to develop the most suitable wavefront measuring method for EUV projection optics. The result is to be reflected on EWMS (EUV Wavefront Metrology System) that measures wavefront aberrations of a six-aspherical mirror projection optics of NA0.25, of a mass-production EUV lithography tool. The experimental results of Point Diffraction Interferometer (PDI) and Lateral Shearing Interferometer (LSI) are shown and the error factors and the sensitivity of astigmatism measurements of these methods are discussed. Furthermore, for reducing these kinds of errors, another type of shearing interferometer called DTI (Digital Talbot interferometer) is newly introduced.

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Masanobu Hasegawa, Chidane Ouchi, Takayuki Hasegawa, Seima Kato, Akinori Ohkubo, Akiyoshi Suzuki, Katsumi Sugisaki, Masashi Okada, Katsura Otaki, Katsuhiko Murakami, Jun Saito, Masahito Niibe, and Mitsuo Takeda "Recent progress of EUV wavefront metrology in EUVA", Proc. SPIE 5533, Advances in Mirror Technology for X-Ray, EUV Lithography, Laser, and Other Applications II, (18 October 2004); https://doi.org/10.1117/12.562431

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