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Staggered folding optical path structure of small-sized grating monochromator with high spectral resolution

A high-spectrum, high-resolution technology, applied in the field of spectral analysis instruments, can solve the problems of increased instrument volume and weight, and achieve the effects of small volume, simple processing and assembly, and compact structure

Inactive Publication Date: 2015-04-08
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A conventional monochromator is composed of an entrance slit, a collimating objective lens, a plane grating, a converging objective lens, an exit slit and a turntable. In order to obtain high spectral resolution, the monochromator of this structure adds a collimating objective lens and an imaging objective lens. The focal length, however, the increase of the focal length leads to an increase in the volume and weight of the instrument

Method used

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  • Staggered folding optical path structure of small-sized grating monochromator with high spectral resolution
  • Staggered folding optical path structure of small-sized grating monochromator with high spectral resolution

Examples

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Embodiment 1

[0013] In the optical path structure of the present invention, such as figure 1 As shown, the working band of the monochromator is 400-800nm, and the object-side numerical aperture is 0.07; the collimating objective lens 3 and the converging objective lens 5 are both spherical mirrors, the radius of curvature is 600mm, and the off-axis angles are 7° and 5.5° respectively , the focal lengths are 300mm and 296.5mm respectively; the plane grating 4 adopts a reflective ruled grating whose grating constant is 1 / 1200mm; The radius is 5400mm, or when the cylindrical reflector is used as the second deflection mirror 6 to eliminate system astigmatism, the radius of curvature of the cylindrical reflector is 3200mm.

[0014] Through optical design software tracking, the theoretical resolution of the optical path structure of a staggered folded small high-resolution grating monochromator constructed in this example can reach 0.1nm, and the optical path length and width are 194mm×172mm.

Embodiment 2

[0016] In the optical path structure of the present invention, such as figure 2 As shown, the working band of the monochromator is 400-800nm, and the numerical aperture on the object side is 0.07; the collimating objective lens 3 and the converging objective lens 5 are both spherical mirrors, the radius of curvature is 600mm, and the off-axis angles are 6.5° and 8° respectively , the focal lengths are 300mm and 295.2mm respectively; the plane grating 4 adopts a reflective ruled grating whose grating constant is 1 / 1200mm; The radius is 3300mm, or when the cylindrical reflector is used as the second deflection mirror 6 to eliminate system astigmatism, the radius of curvature of the cylindrical reflector is 4400mm.

[0017] Through optical design software tracing, the theoretical resolution of the optical path structure of a staggered folded small high-resolution grating monochromator constructed in this example can reach 0.3nm, and the optical path length and width are 194mm×17...

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Abstract

The invention discloses a staggered folding optical path structure of a small-sized grating monochromator with high spectral resolution, belonging to the technical field of spectral analysis instruments. The optical path structure comprises an entrance slit, a collimator objective lens, a plane grating, a convergence objective lens, an exit silt, a rotary table, a first turning reflector and a second turning reflector; a light beam emitted by the entrance silt is radiated to the collimator objective lens after being turned through the first turning reflector, dispersed and split by the plane grating after being collimated, turned by the second turning reflector after being converged through the convergence objective lens, and focused to the exit silt, so that quasi-monochromatic light is obtained. The staggered folding optical path structure is compact in structure, small in size, light in weight, and simple to process, assemble and calibrate. The volume in the length direction of the apparatus is effectively compressed; cylindrical reflectors are adopted as turning reflectors, so that the system astigmatism can be effectively reduced and the energy concentration degree of the exit spectrums of the apparatus is improved. A system has symmetrical photometric characteristics, so that the off axis aberration can be effectively eliminated and the imaging quality is improved.

Description

technical field [0001] The invention belongs to the technical field of spectrum analysis instruments, and relates to an optical path structure of a staggered folded small-scale high-spectrum resolution grating monochromator. Background technique [0002] A monochromator is a spectroscopic instrument used to obtain quasi-monochromatic light. It is a basic test equipment for spectral analysis and spectral characteristic measurement. It is widely used in scientific research, production and quality control. With the continuous development of modern science and technology, miniaturization, light weight, portability and high resolution have gradually become the mainstream trend of monochromator development. A conventional monochromator is composed of an entrance slit, a collimating objective lens, a plane grating, a converging objective lens, an exit slit and a turntable. In order to obtain high spectral resolution, the monochromator of this structure adds a collimating objective ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/02
Inventor 崔继承杨增鹏唐玉国齐向东潘明忠孙慈
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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