Patent ID: 7965756
Filing Date: 2011-06-21
Classification: G02B,H01S

Abstract:
1. An optical element for a ultraviolet gas laser, the optical element being formed by using calcium fluoride crystal and having a light entering plane and a light exiting plane, ultraviolet rays entering by way of the light entering plane and exiting from the light exiting plane, the optical element comprising: at least either of the light entering plane or the light exiting plane being parallel to the (111) crystal face of the calcium fluoride crystal; the laser beam entering from the entering plane passing through: the plane located between the [111] axis and the first azimuth axis in the locus of rotation of the [001] axis around the [111] axis and including the [111] axis and the first azimuth axis; the plane located between the [111] axis and the second azimuth axis in the locus of rotation of the [010] axis around the axis and including the [111] axis and the second azimuth axis; or the plane located between the [111] axis and the third azimuth axis in the locus of rotation of the [100] axis around the [111] axis and including the [111] axis and the third azimuth axis; and exiting from the exiting plane.