A light splitting structure of two prisms parallel to the light source and congruent

Abstract

The invention discloses a one-divided-two prism light splitting structure which is parallel to a light source and is congruent, comprising an M-type prism assembly, an isosceles prism A is arranged at the center of the upper end of the M-type prism assembly, the M-type prism assembly is parallel to the bottom side of the isosceles prism A, and the top angle of the M-type prism assembly is opposite to the top angle of the isosceles prism A, and the top angle of the isosceles prism A is aligned with the lowest point in the middle of the M-type prism assembly. The light splitting structure disclosed by the invention can not only realize that the physical parameters of the split light beams are completely the same, but also that the split light beams and the light source are parallel to each other and in the same direction.

Description

Technical Field

[0001] The invention belongs to the technical field of spectroscopic imaging, and relates to a spectroscopic structure of a bi-prism which is parallel to a light source and is congruent. Background Art

[0002] Most existing beam splitting methods use beam splitting films, as well as combinations of beam splitting films and various optical elements. There are many types of beam splitting films, but no matter which beam splitting film is used, the physical parameters of the split light beams cannot be exactly the same, such as wavelength, optical path, polarization state, etc. The beams split by the structure of beam splitting through a general prism are mostly angled and not parallel to the light source. It is usually more complicated to obtain a beam splitting structure with exactly the same physical parameters and parallel to the light source. Summary of the invention

[0003] The object of the present invention is to provide a congruent biprism beam splitting structure which is parallel to a light source. The beam splitting structure can not only realize that the physical parameters of the split light beams are completely the same, but also that the split light beams are parallel to and in the same direction as the light source.

[0004] The technical solution adopted by the present invention is a one-divided-two prism light splitting structure which is parallel to a light source and is congruent, comprising an M-type prism assembly, an isosceles prism A is arranged at the center of the upper end of the M-type prism assembly, the M-type prism assembly is parallel to the bottom side of the isosceles prism A, and the vertex angle of the M-type prism assembly is opposite to the vertex angle of the isosceles prism A, and the vertex angle of the isosceles prism A is aligned with the lowest point in the middle of the M-type prism assembly.

[0005] The present invention is also characterized in that:

[0006] The M-type prism assembly includes two isosceles prisms B with the same specifications and sizes. The two isosceles prisms B are spliced ​​together to form an M-type structure.

[0007] The angle at the center of the M-shaped structure formed by the two isosceles prisms B is exactly equal to the vertex angle of the isosceles prism A.

[0008] The specifications and dimensions of the two isosceles prisms B are exactly the same as those of the isosceles prism A.

[0009] The vertex angle of isosceles prism A is less than 90°.

[0010] The beneficial effect of the present invention is that the present invention adopts a relatively simple prism structure combination, which not only realizes that the physical parameters of the split light beams are completely the same, but also that the split light beams and the light source are parallel and in the same direction. The accuracy of the structure is not only verified by Tracepro software simulation, but also its reliability is verified by a physical model. The structure can be used as a basic optical unit for a variety of optical systems, including but not limited to visible light imaging systems, infrared imaging systems, and X-ray imaging systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a light splitting structure of a bi-prism parallel to a light source and congruent to the present invention;

[0012] Figure 2 The present invention is a light splitting principle diagram of a light splitting structure of a bi-prism parallel to a light source and congruent therewith.

[0013] In the figure, 1. Isosceles prism A, 2. Isosceles prism B. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] The present invention provides a prism light splitting structure which is parallel to the light source and is congruent (congruent means that all physical parameters of the light beams split by the structure are the same, including but not limited to wavelength, optical path, polarization state, etc.), such as Figure 1 As shown, it includes an M-type prism assembly, an isosceles prism A1 is provided at the center of the upper end of the M-type prism assembly, the M-type prism assembly is parallel to the bottom side of the isosceles prism A1, and the top angle of the M-type prism assembly is opposite to the top angle of the isosceles prism A1, and the top angle of the isosceles prism A1 is aligned with the lowest point in the middle of the M-type prism assembly.

[0016] The M-type prism assembly includes two isosceles prisms B2 of the same specifications and sizes, and the two isosceles prisms B2 are cross-joined and spliced ​​together to form an M-type structure (the adjacent bottom angles of the bottom edges of the two isosceles prisms B2 are cross-joined and overlapped, so that a part of the bottom edges and a bottom angle of the two isosceles prisms B2 overlap and splice to form the M-type prism assembly). The distance between the two vertex angles of the M-type structure and the gap between the M-type structure and the isosceles prism A1 depend on the angle of the vertex angle of the isosceles prism A1.

[0017] The included angle between the two isosceles prisms B2 is exactly equal to the vertex angle of the isosceles prism A1.

[0018] The specifications and dimensions of the two isosceles prisms B2 are exactly the same as those of the isosceles prism A1. The materials of the two isosceles prisms B2 and the isosceles prism A1 are also the same.

[0019] The light splitting principle of the one-divided-two prism light splitting structure of the present invention which is parallel to the light source and congruent is as follows: Figure 2As shown, the light is vertically incident on the bottom edge of the isosceles prism A1, and after undergoing a total reflection at one waist of the isosceles prism A1, it is emitted from the other waist of the isosceles prism A1. Under this condition, after the light passes through the isosceles prism A1, the light emitted from the two waists of the isosceles prism A1 can be completely divided equally, and the physical parameters are the same. According to the principle of reversibility of the optical path, the two isosceles prisms B2 are rotated 180° and form an M-shaped structure. Align the vertex of the isosceles prism A1 with the lowest point in the middle of the M-shaped structure. The light emitted from the two waists of the isosceles prism A1 passes through a small air gap and enters from the upper part of the two inner waists of the M-shaped structure respectively. After the light enters the M-shaped structure, it undergoes total reflection at the two outer waists of the M-shaped structure respectively, and then exits through the bottom edge of the M-shaped structure. The two beams of light emitted from the bottom edge of the M-shaped structure are parallel to the one beam of light emitted from the bottom edge of the isosceles prism A1. Through the combination of isosceles prism A1 and M-type structure, the light can be equally divided and parallel to the light source.

[0020] The vertex angle of the isosceles prism A1 is less than 90°, and the material includes but is not limited to glass and organic glass.

[0021] The gap distance between the M-shaped structure formed by the two isosceles prisms B2 and the isosceles prism A1, as well as the distance between the two vertices of the M-shaped structure, vary according to the vertex angle of the isosceles prism A1, but the relative position of the combination remains consistent.

[0022] Relative positions remain consistent meaning that the bottom edge of the isosceles prism A1 receiving the incident light is parallel to the bottom edge of the M-shaped structure formed by the other two isosceles prisms B2, and the vertex of the isosceles prism A1 is on the perpendicular bisector of the line connecting the two vertices of the two isosceles prisms B2. The vertex angle of the isosceles prism A1 is opposite to the two vertex angles of the two isosceles prisms B2 (180°).

[0023] The two beams of light separated by the one-to-two structure have the same physical parameters, and the two beams are parallel and in the same direction as the light source. After simulation software verification, after changing the incident light angle, the incident light and the outgoing light remain parallel after passing through this light splitting structure. It is only because the incident angle changes that the physical parameters of the separated light beams change, such as optical path and light intensity. In other words, as the incident angle changes, the physical parameters of each separated light beam change accordingly, but they are still parallel and in the same direction as the light source.

Claims

1. A congruent bi-prism light splitting structure parallel to the light source, characterized in that: It includes an M-shaped prism assembly, wherein an isosceles prism A is disposed at the center of the upper end of the M-shaped prism assembly, the M-shaped prism assembly is parallel to the bottom side of the isosceles prism A, and the top angle of the M-shaped prism assembly is opposite to the top angle of the isosceles prism A, and the top angle of the isosceles prism A is aligned with the lowest point in the middle of the M-shaped prism assembly; The M-shaped prism assembly includes two isosceles prisms B with the same specifications and sizes, and the two isosceles prisms B are spliced ​​together to form an M-shaped structure; The included angle at the center of the M-shaped structure formed by the two isosceles prisms B is exactly equal to the vertex angle of the isosceles prism A; The specifications and dimensions of the two isosceles prisms B are exactly the same as those of the isosceles prism A; The vertex angle of the isosceles prism A is less than 90°.

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