CN210981525U - Orthogonal optical system for monochromator - Google Patents

Abstract

The utility model relates to an orthogonal optical system that can be used to monochromator, this orthogonal optical system include along the light path from the object space to being equipped with optical element A, optical element B, aperture diaphragm in proper order like the image space, optical element A is the toroidal mirror, optical element B is variable line distance plane grating, and optical element A and optical element B's position is the mutual quadrature and places, the utility model discloses simple structure, reasonable in design can satisfy the space conflict that the designing requirement of light beam splitting can avoid the device again to the dress is transferred conveniently.

Description

Orthogonal optical system for monochromator

Technical Field

The utility model relates to an orthogonal optical system that can be used to monochromator.

Background

In the application of synchrotron radiation light source, the beam line device plays an important role in exerting its excellent characteristic and making high-level experiment, in its design, most of the components are arranged in a vertical mode, the trend of the light path is in the vertical plane; however, since several beam lines are required to be arranged in each beam exit window of the electronic storage ring, in order to meet the design requirement of beam splitting and avoid the space conflict of the device, a horizontally arranged mirror device is required to be designed, and the mirror device deflects the optical path in the horizontal plane.

With the continuous development of science and technology, people have higher and higher design requirements on orthogonal optical systems, such as simple installation, and the requirement of satisfying design imaging with minimum components, which will promote the development of orthogonal optical systems. However, the existing system has the problems of difficult installation and debugging, difficult improvement of imaging resolution, difficult adjustment of the position of the device when the light beam is split and the like.

Disclosure of Invention

The utility model provides an orthogonal optical system that can be used to monochromator.

The utility model provides a scheme that technical problem adopted is, an orthogonal optical system that can be used to monochromator, include along the light path from the object space to the image space be equipped with optical element A, optical element B, aperture diaphragm in proper order.

Further, the optical element a is a toroidal mirror.

Further, the optical structure of the toroidal mirror is: major radiusR ₁=20000mm, minor radiusρ ₁Angle of incidence of 489.4mmθ ₁=81°。

Furthermore, the optical element B is a variable-pitch planar grating.

Further, the groove function of the variable pitch planar grating is as follows:

，

whereinwIs the position coordinate of any point along the width direction of the grating;σis the nominal groove pitch of the grating;b ₂、b ₃andb ₄respectively, the coefficients of the variable line pitch;

the nominal groove pitchσIs 1/1800 mm^-1Coefficient of said line spacingb ₂、b ₃Andb ₄are respectively 6.63 × 10^-4mm^-1、3.37×10^-7mm^-2、-2.62×10^-10mm^-3。

Further, the optical element A and the optical element B are positioned orthogonally to each other.

Further, the distance between the central point of the optical element A and the central point of the optical element B is 170 mm.

Compared with the prior art, the utility model discloses following beneficial effect has: because the toroidal reflector has two radiuses of a main radius and a secondary radius, and the structural parameters of the optical system are increased compared with other types of reflectors, the defocusing of light rays between a meridian plane and a sagittal plane can be well corrected, so that the focusing positions of the meridian plane and the sagittal plane are consistent, and the imaging quality of the optical system is ensured; in addition, optical elements in devices such as synchrotron radiation light source beam lines and X-ray microscopes can be effectively reduced, so that the processing cost is reduced.

Drawings

The following describes the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of the present invention;

figure 2 is a meridian plane optical path diagram of the present invention;

fig. 3 is a light path diagram of a sagittal plane according to the present invention.

In the figure: 1-a light source; 2-toroidal mirror; 3-variable pitch planar grating; 4-aperture diaphragm.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1, an orthogonal optical system usable with a monochromator, characterized by: comprises an optical element A, an optical element B and an aperture diaphragm which are arranged in sequence from an object space to an image space along an optical path.

In this embodiment, the optical element a is a toroidal mirror.

In this embodiment, the optical structure of the toroidal mirror is: major radiusR ₁=20000mm, minor radiusρ ₁Angle of incidence of 489.4mmθ ₁=81°。

In this embodiment, the optical element B is a variable pitch planar grating and the monochromator wavelength scanning is accomplished by rotating the grating about its central axis.

In this embodiment, the groove function of the variable pitch planar grating is:

，

whereinwIs the position coordinate of any point along the width direction of the grating;σis the nominal groove pitch of the grating;b ₂、b ₃andb ₄respectively, the coefficients of the line pitch change.

In this embodiment, the nominal groove pitchσIs 1/1800 mm^-1Coefficient of said line spacingb ₂、b ₃Andb ₄are respectively 6.63 × 10^-4mm^-1、3.37×10^-7mm^-2、-2.62×10^-10mm^-3。

In this embodiment, the focal equation of the variable-pitch planar grating in the meridian plane is expressed as:

，

the incidence angle and the emergence angle of the grating can be obtained by connecting a focusing equation in a meridian plane with a grating equation in the following formula,

，

whereinλ、mRespectively representing the operating wavelength and diffraction order of the grating,

、

the object distance and the image distance of the grating in the meridian plane are respectively;α ₂、β ₂are respectively gratingsAngle of incidence and angle of reflection;

the value of m is-1.

In this embodiment, the optical element a and the optical element B are positioned orthogonally to each other.

In this embodiment, the distance between the center point of the optical element a and the center point of the optical element B is 170 mm.

In the present embodiment, the optical path diagrams, O, from the meridional plane and the sagittal plane shown in fig. 2 and 3₁、O₂The centers of the toroidal reflector and the variable-pitch planar grating are respectively; as shown in FIG. 2, the light beam emitted from the light source passes through the toroidal mirror and is focused on S₁Then passes through a variable-pitch planar grating and focuses on S₂(ii) a As shown in FIG. 3, in the sagittal plane, the light beam emitted from the light source is directly focused on S through the toroidal mirror₂To (3).

In this embodiment, the distance between the light source on the meridian plane in fig. 2 and the center of the toroidal mirror in fig. 3 is 3128.7mm, the distance between the center of the variable-pitch planar grating and the aperture stop is 100mm, and the incident angle of the variable-pitch planar grating is 100mmα ₂= -74.03 ︒ and reflection angleβ ₂=88.05︒。

In this embodiment, the wavelength range usable for the optical system is 5nm to 105 nm.

The above-mentioned preferred embodiments, and the objects, technical solutions and advantages of the present invention have been further described in detail, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims (4)

1. An orthogonal optical system usable with a monochromator, comprising: include along the light path from object space to image space and be equipped with optical element A, optical element B, aperture diaphragm in proper order, optical element A be toroidal reflector, toroidal reflector optical structure is: major radiusR ₁=20000mm, minor radiusρ ₁Angle of incidence of 489.4mmθ ₁=81 °, the optical element a and the optical element B are positioned orthogonally to each other.

2. The orthogonal optical system usable with a monochromator of claim 1, wherein: the optical element B is a variable-pitch plane grating.

3. The orthogonal optical system usable with a monochromator of claim 2, wherein: the grooving function of the variable-pitch planar grating is as follows:

whereinwIs the position coordinate of any point along the width direction of the grating;σis the nominal groove pitch of the grating;b ₂、b ₃andb ₄respectively, the coefficients of the variable line pitch;

the nominal groove pitchσIs 1/1800 mm^-1Coefficient of said line spacingb ₂、b ₃Andb ₄are respectively 6.63 × 10^-4mm^-1、3.37×10^-7mm^-2、-2.62×10^-10mm^-3。

4. The orthogonal optical system usable with a monochromator of claim 1, wherein: the distance between the central point of the optical element A and the central point of the optical element B is 170 mm.

Images