OPTICAL ELEMENT WITH SAPPHIRE CRYSTALLOGRAPHIC STRUCTURE HAVING PLURALITY OF CRYSTAL PLANES

摘要

An optical element, having a length in a direction of a first axis and a width in a direction of a second axis, wherein the length is greater than or equal to the width. The optical element includes a sapphire crystallographic structure having a plurality of crystal planes, wherein a first crystal plane axis is configured to be perpendicular to the first and the second axis, a second crystal plane axis is configured to be parallel to the first axis and a third crystal plane axis is configured to be parallel to the second axis.