26 November 2012 Test of diffractive optical element for DUV lithography system using visible laser
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Abstract
Diffractive optical element (DOE) is used for off-axis illumination extensively in DUV lithographic system. A method for testing the optical performance of DOE using a visible laser is proposed to simplify the test process. In principle, the optical performance of DOE with a visible laser is analyzed with scalar diffraction theory and numerically simulated using MATLAB program. Compared with the DUV condition, the diffractive pattern distribution is enlarged proportionally with a zero-order spike under the visible laser condition. In experiments, the DOE is tested under He-Ne laser. Its far field diffractive pattern is compared and analyzed with the result tested under the working wavelength of 193.368nm. The shape, the opening angle, the azimuth angle and the pole balance coincide with the values tested in DUV condition. The usefulness of method is verified.
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Zhonghua Hu, Zhonghua Hu, Jing Zhu, Jing Zhu, Baoxi Yang, Baoxi Yang, Yanfen Xiao, Yanfen Xiao, Aijun Zeng, Aijun Zeng, Huijie Huang, Huijie Huang, } "Test of diffractive optical element for DUV lithography system using visible laser", Proc. SPIE 8557, Optical Design and Testing V, 855709 (26 November 2012); doi: 10.1117/12.999681; https://doi.org/10.1117/12.999681
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