Design method of free-form surface optical system with dispersion device

Abstract

The invention relates to a design method of a free-form surface optical system with a dispersion device. The design method comprises the steps of constructing a non-dispersion spherical optical systemby taking a slit of the free-form surface optical system with a dispersion device as an object; placing a dispersion device on a non-dispersion spherical surface in the non-dispersion spherical optical system so as to obtain a dispersion spherical optical system; constructing the dispersion spherical optical system into a dispersion free-form surface optical system; defining the intersection point of characteristic light rays and the free-form surface in the dispersion free-form surface optical system as a characteristic data point on the free-form surface, adopting an iterative algorithm, keeping the coordinates of the characteristic data points on each free-form surface in the dispersion free-form surface optical system unchanged, recalculating the normal of the characteristic data points according to the objective image relation, and then, fitting to obtain a new free-form surface according to the coordinates of the characteristic data points on the free-form surface and the normalobtained through recalculation so as to obtain a final free-form surface optical system with a dispersion device.

Description

technical field [0001] The invention relates to the field of optical design, in particular to a design method of an optical system with a dispersion device. Background technique [0002] Spectroscopy has important applications in the fields of biomedicine, chemical analysis, earth remote sensing, and space exploration, among which the key instrument is an optical system with a dispersive device. Optical systems with dispersive devices have a larger field of view, wider spectral range, and higher resolution, which can promote the development of related application fields and have been the goal that people have been pursuing for a long time. [0003] A free-form surface refers to a non-traditional curved surface that cannot be expressed by spherical or aspherical coefficients. A free-form surface is an optical surface with a complex surface shape that does not have symmetry. Freeform optics encompasses the design of optical systems having at least one freeform surface. In th...

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Problems solved by technology

[0004] However, the existing design methods of free-form surface optical systems with dispersion devices generally calculate the initial solution of the system based on the aberration theory, or perform multi-parameter optimization on the existing system; because the free-form surface has a very high degree of freedom, Coupled with the lack of existing initial systems and the need to consider different wavelengths of light in the design of optical systems with dispersive devices, it is very difficult to design existing free-form optical systems with dispersive devices

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