Leucosapphire flat-concave lens forming flat wavefront for extraordinary beams

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 hy=h0×n0/ny, wherein h0 is the lens thickness in the centre, n0 is an ordinary beam refraction index, while ny 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

 

The invention relates to the technology of lenses for optical systems of modern optical, and optoelectronic and laser devices operating in the ultraviolet, visible and infrared regions of the spectra, and can also be used in the manufacture of lenses of sapphire with a plane wavefront of the extraordinary beam.

A method of obtaining an optical lens, comprising obtaining a convexo-concave workpiece by plastic deformation of the bending plane-parallel plates of the Z-cut crystals l2O3 hemispherical punch or a punch in the form of a spherical segment and the orientation of the axis of symmetry of the workpiece on the optical axis of the lens at subsequent technological operations (see RF patent 2285757, publ. 20.10.2006 IPC index SV 33/00). This method does not allow element made of sapphire, forming a flat wavefront extraordinary beam.

Closest to the proposed technical solution is a flat lens made of sapphire and method of reception of plastically deformed billet, in which the axis of symmetry of the flat lens coincides with the axis of symmetry of plastically deformed billet, and incoming and outgoing surfaces are planes perpendicular to it, and part of the flat surface of the lens formed by the top of the workpiece. However, when normalmapping parallel beam of rays is not created flat wavefront extraordinary beam due to the different speeds of light propagation in the details associated with the change of the optical properties of the crystal during plastic deformation (see RF patent 2482522, publ. 25.05.2013 IPC index G02B 1/02).

This way we obtain a flat collective lens of sapphire for extraordinary rays (parallel beam of light directed perpendicular to the input surface, transparent in the area 25000-2000 cm-1. However, this method allows to obtain a collective lens for the extraordinary beam with a variable wave front in the working aperture.

The objective of the proposed technical solution is the creation of lenses made of synthetic sapphire, forming a planar wave front for extraordinary rays, and transparent in the area 25000-2000 cm-1for a parallel beam of light directed perpendicular to the input surface.

The technical result is achieved with the help of a group of inventions, the United inventive concept: the design of the lens and the way it was received.

PLANO-concave lens made of sapphire, forming a planar wave front for extraordinary rays, made of plastically deformed billet in which a member is a flat surface perpendicular to the axis of symmetry of the workpiece and formed from the top of the workpiece at a distance x0<N, where H is the thickness of the workpiece, and the exit surface has a profile which, providing a change of thickness hy=h0×n0/nywhere h0the thickness of the lens in the center, n0is the refractive index of ordinary ray, and nythe refractive index of the extraordinary beam at a distance Y from the center of the lens.

A method of obtaining a PLANO-concave lens made of sapphire, forming a planar wave front for extraordinary rays, including the manufacturing of the workpiece by plastic deformation of a plane-parallel plate made of Z-cut crystal method the Central ring bending, forming the lens surface using the methods of removal from the workpiece excess layer material with the incoming surface is formed by the vertices as a plane perpendicular to the axis of symmetry of the workpiece at a distance x0<n of its vertices, where H is the thickness of the workpiece, in which unlike the prototype facing concave lens surface is formed as a surface of rotation with a cross section that provides a change in the thickness of the lens hy=h0×n0/nywhere h0the thickness of the lens in the center, n0is the refractive index of ordinary ray, and nythe refractive index of the extraordinary beam at a distance Y from the center of the lens.

Receive new design PLANO-concave lens made of sapphire in this way allows us to provide the unique the properties of the crystal optic lens, in which incident parallel beam of unpolarized beams directed perpendicular to the flat surface of the lens after refraction on the incoming (flat) surface of the lens forms an extraordinary beam, which extends at an angle p to the axis of symmetry of the lens and an ordinary beam at a speed determined by the deflection angle of the optical axis of the crystal from the axis of symmetry of the lens, i.e., dependent on the distance of the ray to the center of the lens. And in the center of the unusual speed of the beam corresponds to a refractive index of n0more, and with increasing distance from the center of the lens, the speed of propagation of the beam is reduced according to the change of refractive index nythe refractive index of the extraordinary beam at a distance Y from the center of the lens. To create a planar wave front time passing rejected the extraordinary beam to refraction at the outgoing surface must be increased to compensate for a lower rate, until the length of time equal to the passage of a beam (ordinary and extraordinary) in the center of the lens. Change the time of the passing beam is proportional to the change in the refractive index of the extraordinary beam with increasing distance from the center of the lens.

The drawing shows a diagram of the PLANO-concave lens made of sapphire, forming a planar wave front for extraordinary rays and refraction of the teaching, falling perpendicular to the input surface of the lens, where 1 is the lens thickness in the center of the h0Z is the optical axis of the plastically deformed crystal, 2 - part flat surface of the lens, 3 - facing concave surface of the lens, 4 - ordinary ray, 5 - extraordinary ray. The angle R between the ordinary beam 4 and the extraordinary ray 5 after refraction at the input surface of the lens. Y - the distance from the lens center, the largest of which is formed profile facing - concave surface with the thickness of the lens hy=h0×n0/ny.

A specific example of a PLANO-concave lens made of sapphire, forming a planar wave front for extraordinary rays from a crystal is made of sapphire the workpiece in a plane-parallel plate is Z-cut, which is subjected to plastic deformation of the bending hemispherical punch with a radius of 32 mm Workpiece thickness H=6.0 mm treated by removal of excess material by the method of grinding and polishing to obtain the input surface of the lens plane perpendicular to the axis of symmetry of the workpiece, and a second lens surface, symmetrical relative to the center of the part, formed as a surface of rotation with a cross section that provides a change of thickness hy=h0×n0/nywhere - h0the thickness of the lens in the center, n0while the motor of refraction of the ordinary ray, and nythe refractive index of the extraordinary beam at a distance Y from the center of the lens.

Received a PLANO-concave lens is a lens formed with a plane wavefront of the extraordinary ray in the fall on the surface of the beam directed perpendicular to the input surface of the lens.

At normal incidence of the beam of the ordinary ray is refracted upon exiting surface of the lens. The delay time of the extraordinary ray depends on the distance of the ray to the center of the lens and its thickness in the center, the distance of the location of the input surface of the lens relative to the workpiece. Synthetic sapphire is the material with the normal dispersion of the refractive index of light, and changing the wavelength of the radiation shape facing the surface of the lens, you should consider using the ratio of hy=h0×n0/ny.

Lenses manufactured in the described manner, have unique properties that must be used in the manufacture of crystalline parts made of sapphire with a plane wavefront extraordinary beams used in the optical systems of modern devices operating in the ultraviolet, visible and infrared regions of the spectra.

1. PLANO-concave lens made of sapphire, forming a planar wave front for extraordinary rays, made of practicesinformation workpiece, where a member is a flat surface perpendicular to the axis of symmetry of the workpiece and formed from the top of the workpiece at a distance x0<N, where H is the thickness of the workpiece and the output surface has a profile that provides the variation of thickness hy=h0×n0/nywhere h0the thickness of the lens in the center, n0is the refractive index of ordinary ray, and nythe refractive index of the extraordinary beam at a distance Y from the center of the lens.

2. A method of obtaining a PLANO-concave lens made of sapphire, forming a planar wave front for extraordinary rays, including the manufacturing of the workpiece by plastic deformation of a plane-parallel plate made of Z-cut crystal method the Central ring bending, forming the lens surface using the methods of removal from the workpiece excess layer material with the incoming surface is formed by the vertices as a plane perpendicular to the axis of symmetry of the workpiece at a distance x0<n of its vertices, where H is the thickness of the workpiece, characterized in that the facing concave lens surface is formed as a surface of rotation with a cross section that provides a change in the thickness of the lens hy=h0×n0/nywhere h0the thickness of the lens in the center, n0is the refractive index of ordinary ray, and n the refractive index of the extraordinary beam at a distance Y from the center of the lens.



 

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