COMPACT TWO-BY-N OPTICAL COMPONENTS BASED ON BIREFRINGENT WALK-OFF CRYSTALS

摘要

The optical device (100, 300, 400, 500, 550, 580, 600) of claim 1 I / O port (102 or 112, 302, or 312), the 2 I / O port (112 or 102, 312 or 302, 552 and a variation ever optical element (108, 308, 408, 508, 608), 582) and, a 1 I / O port and a polarization which is located between the 2 I / O port. The 2 I / O port is optically aligned with the first 1 I / O port. The second opposed walk-off crystal pair is a mirror image of the first opposed walk-off crystal pair. Each opposed walk-off crystal pair comprises two walk-off crystals (128, 130). Each workpiece-off crystal has a walk-off direction (140, 142). Each of the work off crystal includes a second surface 126 opposing the first surface 122, a first plane perpendicular to the substantially parallel attachment surfaces (132, 134), attached to the work off-direction side. Walk-off crystals are attached to one another with their attachment faces in contact, and their walk-off directions are opposed. The first opposed walk counter workpiece-off crystal workpiece-off crystals of the first to the contrary the work-off directions (140A, 142A) and a second opposed walk-off crystal pair (120B) of the (128A, 130A) to the off crystal pair (120A) Walk-off direction (140B, 142B) to the contrary of (128B, 130B) defines a direction of rotation to the contrary. Facing the work-off crystal pair (120A, 120B) has a second surface of the crystal pairs, but in contact with the first surface of another crystal pairs work off direction of the crystal pairs is attached to each other so as to be perpendicular to the walk-off directions of the other crystal pairs .