FIELD: laser technology. SUBSTANCE: proposed projection lens includes two plano-convex lenses and two correction elements in the form of plane-parallel plates. Correction elements are made of two glasses showing different refractive indices and dispersion coefficients and aspheric boundary of their joint. Boundary profile is described by series specified in formula of invention. Parameters of elements of optical system are selected on condition of provision for correction of spherochromatic and field aberrations for required numerical aperture of lens in preset spectral range. EFFECT: invention secures increase of relative aperture of projection lens, reduced loss of focused radiation, decreased thickness of lens along axis, diminished field aberration when radiation of extended source is focused and simplification of manufacturing technology. 8 cl, 2 dwg
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