LEUCOSAPPHIRE FLAT-CONCAVE LENS FORMING FLAT WAVEFRONT FOR EXTRAORDINARY BEAMS Russian patent published in 2015 - IPC G02B1/02 G02B1/08 C30B33/00 

FIELD: physics, optics.

SUBSTANCE: invention can be used in optical systems of UV, visible and IR optical, optoelectronic and laser devices. A flat-concave lens is made of a plastically deformed piece part, wherein an integral flat surface is perpendicular to an axis of symmetry of the piece part and formed from an apex of the piece part at x₀<H, wherein H is the thickness of the piece part. An output surface of the lens has a profile providing measuring the thickness h_y=h₀×n₀/n_y, wherein h₀ is the lens thickness in the centre, n₀ is an ordinary beam refraction index, while n_y is an extraordinary beam refraction index at a distance Y from the lens centre. The piece part is made by the plastic deformation of a parallel-sided plate of a crystal Z-section by the central annular bend. The lens surface is formed by removing an excessive layer of the material from the piece part.

EFFECT: producing the leucosapphire lens forming the flat wavefront of extraordinary beams and transparent within 25,000-2,000 cm^-1 for a parallel beam of light perpendicular to the input surface.

2 cl, 1 dwg