An Optimization Method of Grating Monochromator

Abstract

The present invention relates to a method for optimizing a grating monochromator, which comprises the following steps: step S0, providing a light source, a front focus mirror, a plane mirror and a variable line distance grating; step S1, making the light emitted by the light source After being converged by the front focusing mirror, it is incident on the plane mirror, and then reflected by the plane mirror to the variable line spacing grating, and finally the diffracted light generated by the variable line spacing grating is converged to a focal point; step S2 , using the focus of the front focus mirror as a virtual light source, adjusting the focal length of the front focus mirror so that the distance between the virtual light source and the variable line distance grating is equal to the distance between the focus point and the The distance between the variable line-spacing gratings; step S3, calculating the focus coefficient of the variable line-spacing gratings according to the grating equation and the focusing conditions of the variable line-spacing gratings. In the present invention, in the case of using a variable line distance grating, the variable angle grating monochromator can still select different focusing constants, thereby realizing a flexible working mode.

Description

technical field [0001] The invention relates to an optimization method of a grating monochromator. Background technique [0002] Large scientific devices such as synchrotron radiation devices and X-ray free electron laser devices have been widely used in basic scientific research and industrial applications. The X-rays generated by this kind of large scientific device generally need to be focused and monochromatic before being used in scientific experiments. required monochromatic light. In the soft X-ray band, a grating is generally used as a dispersive element, and this kind of monochromator with a grating as a dispersive element is called a grating monochromator. [0003] like figure 1 As shown, in the grating monochromator, the angle between the incident light and the normal line of the grating 1' is the incident angle, and the angle between the diffracted light and the normal line of the grating 1' is the diffraction angle. If the incident angle of the grating 1' is...

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Problems solved by technology

However, at this time, the variable pitch coefficient b of the variable pitch grating 2 and the reference wavelength and focusing constant C selected during optimization ff , and the object image distance of the variable line distance grating are related. Therefore, once these parameters are determined, they cannot be changed arbitrarily. In other words, the focus constant C cannot be changed arbitrarily when using the monochromator of the variable line distance grating. ff , there can only be a unique focusing constant C at a certain wavelength ff , which means that this kind of grating monochromator can no longer choose the working mode flexibly

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