OPTICAL BEAM EXPANSION-COMPRESSION DEVICE Russian patent published in 1997 - IPC

FIELD: optical engineering. SUBSTANCE: device has several prism pairs consisting of rectangular prisms and positioned at angle to one another. Angle at vertex of each prism equals , where n_i is refractive index of prism material; prism pairs are positioned relative to each other so that angle between output edge of preceding prism and input edge of next prism is determined by expression β_k= arctgn_k, where n_k is refractive index of preceding prism material. EFFECT: more effective design. 2 dwg