FIELD: optical engineering.
SUBSTANCE: method can be used for making lenses of leukosapphire and of other single-axis crystals for optical systems working within visible and IR spectral areas. Concave-convex blanks are made by plastic deformation of curve of flat-parallel plates from Z-cut of Al2O3 crystals. Plastic deformation of curve is made by means of chisel made in form of spherical segment. Entering surface of lens is formed by means of methods of rejection of excess layer of material out of blank as aspheric surface. Equation of axial cross-section of that aspheric surface looks like y=5,395 10-5x3+0,008x2+0,012x-0,023. Optical axis of lens is oriented along axis of symmetry of blank. Concave-convex lenses produced have minimal birefringence for convergent beams being transparent within 25000-2000 cm-1 area.
EFFECT: wider area of transparency.
2 dwg
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