Abstract

Submicrometer alignment of two mask patterns on the top and the bottom surface of a thick glass substrate is possible by using optical copying. The optical copying step transfers an alignment pattern from one surface to the other by shadow casting or Fresnel propagation. In a demonstration experiment, the alignment between the two surfaces of a 3-mm-thick quartz glass substrate was achieved with a precision of 0.5–0.7 μm.

© 1992 Optical Society of America

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