CN-122016045-A - Monochromator system based on transmission grating

CN122016045ACN 122016045 ACN122016045 ACN 122016045ACN-122016045-A

Abstract

The invention discloses a monochromator system based on a transmission grating, which comprises a monochromator chamber, wherein an entrance slit frame and a grating adjusting frame are respectively arranged at two ends of the inside of the monochromator chamber, a lens frame is further arranged between the entrance slit frame and the grating adjusting frame, a focusing toroidal mirror is arranged on the lens frame, the transmission grating is arranged on the grating adjusting frame, an extension rod is arranged at the front end of the monochromator chamber, and a light source is arranged at the end part of the extension rod. The invention has the beneficial effects that under the condition that the solid angle of the transmission grating is unchanged, the incidence angle of the grating is changed through the rotation angle of the grating adjusting frame, so that the angles of the focused light with different wavelengths are the same, the focused light can be ensured to be output through the fixed seam.

Inventors

WEI LAI
WANG MENG
FAN QUANPING
WANG SHAOYI
CHEN ZHONGJING
ZHOU WEIMIN

Assignees

中国工程物理研究院激光聚变研究中心

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (5)

1. A monochromator system based on a transmission grating is characterized by comprising a monochromator chamber (1), wherein an entrance slit frame (6) and a grating adjusting frame (4) are respectively arranged at two ends inside the monochromator chamber (1), a lens frame (3) is further arranged between the entrance slit frame (6) and the grating adjusting frame (4), a focusing toroidal mirror (7) is arranged on the lens frame (3), a transmission grating (8) is arranged on the grating adjusting frame (4), an extension rod (9) is arranged at the front end of the monochromator chamber (1), and a light source (5) is arranged at the end part of the extension rod (9).
2. The transmission grating based monochromator system according to claim 1, characterized in that the focal length formula of the focusing toroidal mirror (7) is: ; ; Wherein, the Is the radius of curvature of the meridian plane, Is the radius of curvature of the sagittal plane, For the focal length of the sagittal plane, As a function of the angle of incidence, Is meridian focal length.
3. The transmission grating based monochromator system according to claim 2, characterized in that the focal toroidal mirror (7) has a meridian plane radius of curvature of 30000mm, a sagittal plane radius of curvature of 36.5mm, a meridian plane width of 50mm, a sagittal plane width of 15mm, and the reflective surface of the focal toroidal mirror (7) is gold plated with a glancing incidence angle of 88 °.
4. A monochromator system based on a transmission grating according to claim 3, characterized in that the diffraction formula of the transmission grating (8) is: ; at the time of normal incidence of the incident light, , ; Wherein, the At a wavelength of Is used for the first order diffraction angle of (a), Is a constant of the grating which is a function of the grating, Is the diffraction order; when obliquely incident, for the same wavelength Diffraction angle of it The method meets the following conditions: ; Substitution into The method comprises the following steps of: ; let the wavelength of the light in the direction be From the oblique incidence grating equation: ; according to normal incidence relation The method comprises the following steps of: ; at this time the original position The wavelength observed at becomes By adjusting the angle of incidence when the transmission grating (8) rotates along the reticle direction axis Light of different wavelengths can be observed in the same direction.
5. The transmission grating based monochromator system according to claim 4, characterized in that the transmission grating (8) is 4000lp/mm with an effective area of 2mm x 2mm.

Description

Monochromator system based on transmission grating Technical Field The invention relates to the technical field of soft X-rays, in particular to a monochromator system based on a transmission grating. Background The ultra-fast soft X-ray absorption spectrum technology based on the laser plasma light source plays an important role in the research of the ultra-fast chemical reaction process of the energetic material, and the design of a proper monochromator system based on the transmission grating directly determines the confidence level and the precision degree of absorption spectrum data. The existing soft X-ray grating monochromator mostly adopts a reflective diffraction grating, has larger grating size and higher requirement on reflection angle adjustment precision, and is not beneficial to being used in a light source with small flux and large divergence angle of laser plasma. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a monochromator system based on a transmission grating. The monochromator system based on the transmission grating comprises a monochromator chamber, wherein an entrance slit frame and a grating adjusting frame are respectively arranged at two ends of the inside of the monochromator chamber, a lens frame is further arranged between the entrance slit frame and the grating adjusting frame, a focusing toroidal mirror is arranged on the lens frame, the transmission grating is arranged on the grating adjusting frame, an extension rod is arranged at the front end of the monochromator chamber, and a light source is arranged at the end part of the extension rod. Preferably, the focal length formula of the focusing toroidal mirror is: ; ; Wherein, the Is the radius of curvature of the meridian plane,Is the radius of curvature of the sagittal plane,For the focal length of the sagittal plane,As a function of the angle of incidence,Is meridian focal length. Preferably, the focal toroidal mirror has a meridian radius of curvature of 30000mm, a sagittal radius of curvature of 36.5mm, a meridian width of 50mm, a sagittal width of 15mm, and a reflective surface of the focal toroidal mirror coated with gold and a grazing incidence angle of 88 °. Preferably, the diffraction formula of the transmission grating is: ; at the time of normal incidence of the incident light, , ; Wherein, the At a wavelength ofIs used for the first order diffraction angle of (a),Is a constant of the grating which is a function of the grating,Is the diffraction order; when obliquely incident, for the same wavelength Diffraction angle of itThe method meets the following conditions: ; Substitution into The method comprises the following steps of: ; let the wavelength of the light in the direction be From the oblique incidence grating equation: ; according to normal incidence relation The method comprises the following steps of: ; at this time the original position The wavelength observed at becomesBy adjusting the angle of incidence when the transmission grating is rotated along the reticle direction axisLight of different wavelengths can be observed in the same direction. Preferably, the transmission grating is 4000lp/mm, and the effective area is 2mm by 2mm. The invention has the advantages that under the condition that the solid angle of the transmission grating is unchanged, the incidence angle of the grating is changed through the rotation angle of the grating adjusting frame, so that the angles of the focused light with different wavelengths are the same, the focused light can be ensured to be output through the fixed seam. Drawings FIG. 1 is a schematic diagram of a transmission grating based monochromator system; FIG. 2 is a schematic diagram of transmission grating dispersion; FIG. 3 is a schematic diagram of zemax simulated ray tracing; FIG. 4 is a schematic diagram of a zemax simulated dot column at 0.1kev, 1kev, 2 kev; FIG. 5 is a schematic diagram of zemax simulated PSFs at 0.1 kev; FIG. 6 is a schematic diagram of zemax simulated PSFs at 1 kev; FIG. 7 is a schematic diagram of zemax simulated PSFs at 2 kev; In the figure, 1-monochromator room, 3-mirror holder, 4-grating adjusting frame, 5-light source, 6-slit-in frame, 7-focusing toroidal mirror, 8-transmission grating, and 9-extension rod. Detailed Description For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the follo