Method for manufacturing substrate

Abstract

A method for manufacturing a substrate is provided. The method includes irradiating a single crystal substrate with a beam of laser or charged particles while moving an irradiation point of the beam with respect to the single crystal substrate so that a trajectory of the irradiation point on a surface of the single crystal substrate describes a striped pattern of straight lines. Non-crystalline regions are formed in the single crystal substrate along the trajectory. The irradiation is repeated multiple times so that directions of the striped patterns are different from each other among the multiple times of irradiation. The repetition of the irradiation changes warpage of the single crystal substrate. All of directions of the straight lines described in the multiple times of irradiation are not parallel to any of directions of crystal axes of the single crystal substrate in a plane parallel to the surface.

Dependencies are inferred from the claim text.