TELESCOPIC SYSTEM FOCUSING LASER RADIATION Russian patent published in 2001 - IPC

FIELD: optical instrumentation, design and manufacture of optical systems for laser devices. SUBSTANCE: telescopic system includes eye-piece, mobile focusing element and objective lens placed in sequence. Focusing element with positive focal power is fabricated in the form of plane-parallel plate from plane-convex and plane-concave lenses joined by non-plane surfaces. Objective lens is composed of correction element and power unit with positive optical power. Correction element is manufactured in the form of plane-parallel plate made of two glasses with different refractive indices and aspherical joining boundary. Technical result of invention lies in achievement of larger magnification of telescopic system with focusing over small length along axis, improved quality of correction of focused radiation, expansion of distance within which limits laser radiation focuses into spot having size close to diffraction limit thanks to it, reduced mass and size characteristics of system. EFFECT: achievement of larger magnification of telescopic system. 5 cl, 3 dwg