Wave plate and its manufacturing method
AssigneeAsahi Glass Company, Limited
InventorMotoshi Ono
Life of this patent
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Abstract
A wave plate is disclosed which includes a glass plate having a thickness of at least 0.1 mm and at most 5 mm. The glass plate has a plurality of strip-shaped birefringent regions substantially in parallel with a surface of the glass plate. The axial directions of the strip-shaped birefringent regions are the same with one another, and substantially in parallel with the surface of the glass plate. The wave plate has a retardation value of from 80 to 450 nm as measured with incident light having a wavelength of 540 nm.
Claims7
A process for producing a wave plate, comprising irradiating a glass plate with a laser beam condensed by a lens or a concave mirror so as to be focused in the glass plate or on a surface thereof, scanning the glass plate or the laser beam in this state to form a birefringent region, and thereby inducing a uniaxial birefringence.
Dependencies are inferred from the claim text.