COLLIMATING OPTICAL SYSTEM FOR SEMICONDUCTOR LASER Russian patent published in 1998 - IPC

FIELD: optical instrumentation engineering, collimating optical systems with refractory elements, systems of optical location, communication control, observation instruments. SUBSTANCE: collimating optical system for semiconductor laser 1 has objectives 2, 3 and groups 4, 5 of prisms positioned in sequence in paths of rays. Ribs of refractory dihedral angles of prisms 4, 5 are oriented in parallel to plane of semiconductor junction. Refractory angles of prisms 4, 5 are selected within limits 25-40 deg. Angular magnification Г of groups of prisms 4, 5 is chosen from following relation Г = θ_I/θ_II, where θ_II and θ_I are angles of divergence of radiation of semiconductor laser in planes correspondingly parallel and perpendicular to plane of semiconductor junction. Front focal plane of objective is displaced relative to object plane by distance δ₀ determined by relation δ₀= (a_II-Г•a_I)/(5/6•Г•θ_I-θ_II),, where a_II and a_I are dimensions of luminous body of semiconductor laser in planes parallel and perpendicular to plane of semiconductor junction correspondingly. Longitudinal spherical aberration δ(u) of objective is chosen from following relation δ(u) = -2/3•δ₀•(u/θ_I)², where u is aperture angle of objective. EFFECT: expanded application field, improved operational characteristics. 3 dwg