Patent ID: 6707838
Filing Date: 2004-03-16
Classification: H01S

Abstract:
A stray light cutting structure for an optical device provided with an optical component, which includes a plurality of side faces longitudinal to an optical axis of the optical device and a plurality of end faces transverse to the optical axis, and through which a predetermined light beam travels in parallel to the optical axis, the structure being for cutting stray light, which travels at an angle to the optical axis of the optical device to enter the optical component through one of the end faces, and comprisingat least one notch formed on one of the side faces of the optical component, wherein the notch is formed only at the middle of the optical component in the longitudinal direction thereof and the depth d1 of the notch satisfies formula d1>(L/2)tan &thgr; wherein &thgr; represents the angle between said one side face of the optical component and the direction of travel of the stray light in the optical component and L represents the length of the optical component.