RU2470333C1 - Method of making diffraction grating - Google Patents

Abstract

FIELD: physics, optics.

SUBSTANCE: invention relates to optics and specifically to diffraction grating-type optical elements and is meant for producing said elements. The method of making a diffraction grating involves forming alternating layers of two substances of different permittivity. Layers of these two substances are formed by parallel winding of two bands of different materials, one having light-reflecting properties while the other does not, onto an elongated plate along its length to enable formation of a plane in circumferential winding - by winding the band on that plane, and/or cross cutting the layer of the wound band on the plane, and/or cross polishing on the plane of the layers of the wound band.

EFFECT: simple process of making a diffraction grating.

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Description

A method of manufacturing a diffraction grating relates to optics, namely to optical elements such as diffraction gratings, and is intended for their production.

Known methods for the manufacture of diffraction gratings (Physical Encyclopedic Dictionary. - M .: Sov. Encyclopedia, 1984, p. 169). The structure of the diffraction gratings of regularly arranged elements is applied to the substrate or inside the substrate at equal distances from each other. Distinguish the manufacture of reflective or transparent diffraction gratings, including slotted.

A method for manufacturing a diffraction grating has also been patented (RF Patent No. 2242776, IPC ⁷ G02B 5/18, published on December 20, 2004). It consists in exposing the holographic plate in the light field of two coherent light sources and in its development.

There is a method by which a composite diffraction grating is made (RF Patent No. 106003, IPC G02B 5/18 (2006.01), publ. 17.01.2011). Here, on the first diffraction grating, a second and subsequent diffraction gratings are fixed through a gasket transparent to electromagnetic waves, i.e. create a multilayer diffraction grating.

Close to the patented method and the method according to which produce a diffraction grating for ultraviolet and x-ray radiation (RF Patent No. 2104576, IPC ⁶ G02B 5/18, publ. 02/10/1998). According to it, a diffraction grating is formed on a substrate with a structure deposited on it in the form of alternating layers of at least two substances with different dielectric constants.

The disadvantage is the complexity and high cost of manufacturing alternating layers, because this requires serious and accurate equipment.

A new method of manufacturing a diffraction grating also consists in creating alternating layers of two substances with different dielectric constants.

But new in it is that the layers of these two substances are created by parallel winding of two tapes of different materials, one of which has light-reflecting properties, and the other does not, on an elongated plate along its length, ensuring the formation of a plane in the transverse winding direction or winding tapes along this plane, and / or cross-cutting a layer of wound tapes along a plane, and / or transverse grinding along a plane of layers of wound tapes.

The figure shows a schematic frontal view of a diffraction grating created in a new way. Two tapes of different materials are shown here: one from light-reflecting material 1 (from aluminum) and one from non-light-reflecting material 2, for example, light transmitting (from transparent plastic).

Both tapes are simultaneously wound on an elongated plate 3 along its length in a plane located transversely, and parallel to it, they cut or grind the resulting diffraction grating. The upper and lower edges of the bends of the tapes (1 and 2) are cut off.

The technical result of the new method is the simplicity and low cost of manufacturing a diffraction grating.

If ribbons (1 and 2) with a thickness of 0.01 mm are taken, then a diffraction grating with such a period will be obtained, which means with the number of strokes per mm equal to 100, which is quite acceptable for practical use in ordinary practice. The cheapness and speed of its manufacture will ensure widespread use of devices with such gratings.

Claims (1)

A method of manufacturing a diffraction grating, which consists in creating alternating layers of two substances with different dielectric constants, characterized in that the layers of these two substances are created by parallel winding of two tapes of different materials, one of which has light-reflecting properties, and the other does not, on the elongated the plate along its length, ensuring the formation of a plane in the transverse winding direction - due to the winding of tapes along this plane, and / or transverse cutting of the layer of wound tapes along the plane, and / or transverse grinding along the plane of the layers of wound tapes.