Patent ID: 8235605

Claim:
A self-standing parallel plate beam splitter for performing a function to divide light incident thereon by reflecting or transmitting the light depending upon a wavelength of the light, wherein the self-standing parallel plate beam splitter is constructed in a structure in which a front side incline plane and a back side incline plane formed at opposite sides of a substrate is at an angle of 45 degrees to a bottom plane of the substrate, whereby, when the bottom plane of the substrate is attached to a top plane of a sub mount having a flat bottom plane, the front side incline plane and the back side incline plane are at a tilt angle of 45 degrees to the top plane of the sub mount, and dielectric thin films or metal thin films are deposited on the front side incline plane and the back side incline plane such that the front side incline plane and the back side incline plane have transmissivity or reflexibility of a ratio predetermined with respect to light of a specific wavelength.