Air spaced Etlons
Solid Etalons
Wave-plates(Retarders)
Germanium Windows
3D projection prisms
Projection light guide
“Google glass”prisms
Optical isolator core
Collimator
Optical Pigtail
Birefringent wedges
Crystal beam displacers
Glass rod and glass tube
Plano-concave cylindrical lens
Plano Convex Cylindrical Lens