Flat lens from leuco sapphire with focus of e waves

FIELD: physics.

SUBSTANCE: this flat lens is made from blank is made from high-temperature plastic straining of plate produced from Al2O3 crystal Z-cut. Mirror axis of said plate is aligned with that of male die with working surface described by 4th degree polynomial y = ΣKakxk, where y, x are coordinates of cross-section with centre at mirror axis, ak are factors describing the focal length and lens depth at k = 1…4. Flat lens inlet and outlet surfaces are planes perpendicular to mirror axis of the blank and lens. Flat lens outlet surface and blank have common point at lens mirror axis. Outlet surface is defined by required depth of the flat lens.

EFFECT: lens for parallel light beam directed perpendicular to part inlet surface.

1 dwg

 

The invention relates to the technology of lenses for modern optical systems, optical and optoelectronic devices operating in the ultraviolet, visible and infrared regions of the spectra, and can be used to obtain a flat lens made of sapphire for the extraordinary beam.

Flat lens made of sapphire for extraordinary rays with improved optical, mechanical and structural properties have the appropriate applications associated in particular with the transformation of monochromatic polarized light into focus at a point on the axis of symmetry of the details of the rays, and also with the protection of high-precision optical-electronic devices of new generation. A distinctive feature of the lenses is the fact that it works as a converging lens with a given focal length only for extraordinary rays, while not rejecting the ordinary rays at normal incidence of the rays on the lens.

A method of producing optical lenses from single crystals, including the fabrication of concave-convex workpiece by plastic deformation of the bending plane-parallel plates of Z-cut crystals Al2O3punch with a given profile of the working surface and the subsequent formation of the incoming surface of the lens using the methods of removal from the workpiece excess layer material�, moreover, the plastic deformation of the bending is carried out, a punch surface which is a surface of revolution with a profile described by the equation of the parabola yc=ax+b, where "C" represents the refractive index, "a" and "b" are the characteristics of the lens, then a member of the lens surface formed by the methods of removal from the workpiece excess layer of material such as hemispherical, with a radius R to a predetermined thickness, after providing the refraction of the rays passing along the optical axis, the optical axis of the lens oriented along the axis of symmetry of the workpiece.

This method does not allow to obtain a lens with a focus only extraordinary rays of sapphire (Cm. RF patent №2377614 published 27.12.2009 index IPC G02B 1/02, B29D 11/00).

The closest to the proposed technical solution is a method of producing a flat lens made of sapphire, including the fabrication of concave-convex on the workpiece by plastic deformation of the bending plane-parallel plate of Z-cut crystal, characterized in that the lens formed using the methods of removal from the workpiece excessive material layer as a parallel plate perpendicular to the axis of symmetry of the workpiece aligned with the axis of the cone of the optical axis, a predetermined thickness, wherein a part of the flat surface of the lens located on races�toyan x< δ from the top of the workpiece, where δ is the thickness of the workpiece (See RF patent №2482522, published on 20.05.2013 by index IPC G02B 1/02).

This way you get a flat lens made of sapphire parallel beam of light, transparent in the area 25000-2000 cm-1. However, this method does not allow to obtain a flat lens with a focus of extraordinary rays.

The objective of the proposed technical solution is the creation of a flat lens made of sapphire with extraordinary focus for parallel rays of the light beam directed perpendicular to the incoming surface of the part, transparent in the spectral region 25000-2000 cm-1.

Flat lens made of sapphire with a focus extraordinary rays produced from billets obtained by high-temperature plastic deformation of the plate from Z-cut crystal of Al2O3axis of symmetry of which coincides with the direction of the axis of symmetry of the punch having a working surface in cross-section described by a polynomial of the fourth degree y=ΣKandkxkwhere y, x - coordinates of the cross-section centered on the axis of symmetry, andk- the coefficients describing the focal length and the thickness of the lens, k=1...4, incoming and outgoing lens surfaces are planes perpendicular to the axis of symmetry of the workpiece and the lens, and facing the flat surface of the lens and the workpiece have �bsuy a point on the axis of symmetry of the lens, as a part of the surface is determined by the desired thickness of the lens.

Getting a flat lens made of sapphire with a focus extraordinary rays allows to provide the unique properties of plastically deformed crystal in which when falling parallel beam directed perpendicularly to the surface of the lens, after refraction at the input surface of the lens extraordinary rays propagate at an angle to the axis of symmetry of the lens and are refracted at the second surface of the lens in focus located on the axis of symmetry of the parts, meaning that it works as a converging lens with a given focal length only for extraordinary rays, while not rejecting the ordinary rays, due to a necessary change in the optical indicatrix of the crystal and the characteristics of the part.

The drawing shows the scheme of obtaining a flat lens made of sapphire, where 1 is the workpiece obtained high-temperature plastic deformation of the plate from Z-cut crystal, in which Z is the optical axis of the crystal, deployed relative to the axis of symmetry at a given angle for each point on the surface; 2 - flat lens with focus extraordinary rays; 3 and 4 - incoming and outgoing surface of the lens, respectively.

A specific example of obtaining a flat lens made of sapphire with a focus extraordinary rays

From Krista�La sapphire is used for the workpiece 1, obtained by plastic deformation of the bending plane-parallel plate with a thickness of 6.1 mm Z-cut sapphire, a punch having a cross-section of the working surface described by a polynomial of the fourth order

y=-0,0050 x4+0,0630 x3-0,0435 x2+0,0050 x, which results in a reversal of the optical axes of the crystal relative to the axis of symmetry. Billet with "aspherical" inner surface processed by removing excess material by the method of grinding and polishing to obtain the plates, perpendicular to the axis of symmetry of the blank, and facing the flat surface 4 of the lens and the workpiece have a common point on the axis of symmetry of the lens 2, and a part of the surface 3 is defined by a thickness equal to 4.3 mm.

Received flat lens is a lens with focus, equal 11713,65 mm for extraordinary rays falling on the surface of the beams directed perpendicularly to the surface of the component.

Ordinary rays in a flat lens at normal incidence rays in detail, not refracted.

Flat lens made of sapphire with a focus extraordinary rays produced from billets obtained by high-temperature plastic deformation of the plate from Z-cut crystal of Al2O3axis of symmetry of which coincides with the direction of the axis of symmetry of the punch having a working surface�knosti in cross section, described by a polynomial of the fourth degree y=ΣKandkxkwhere y, x - coordinates of the cross-section centered on the axis of symmetry, andk- the coefficients describing the focal length and the thickness of the lens, for k=1...4 entering and leaving the surface flat lenses are planes perpendicular to the axis of symmetry of the workpiece and the lens, and facing the flat surface of the lens and the workpiece have a common point on the axis of symmetry of the lens, and part of the surface is determined by the desired thickness of the flat lens.



 

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