Double-free-form-surface lens for laser beam shaping and design method thereof

Abstract

The invention discloses a design method of a double-free-form-surface lens for laser beam shaping and belongs to the technical field of non-imaging optics and laser beam shaping. An initial structure of the double-free-form-surface lens is set according to design requirements, the double-free-form-surface lens meeting lighting requirements is designed according to the relation of energy conservation, the refraction law and the optical path and with the assistance of a computer, and therefore after incident laser beams pass through the lens and are deflected, preset strength distribution and preset phase distribution are generated. The double-free-form-surface lens comprises double free-form surfaces, namely the front surface and the rear surface, and in addition, the front free-form surface and the rear free-form surface are obtained through surface fitting discrete data points. The invention further discloses the double-free-form-surface lens for laser beam shaping based on the method. A continuous free-form-surface form is obtained, the surfaces can be processed, regulating of strength distribution and phase distribution of the laser beams can be achieved at the same time, the control capability is strong, and the design efficiency is high.

Description

technical field [0001] The invention relates to the technical field of non-imaging optics and illumination, in particular to a double free-form surface lens for laser beam shaping and a design method thereof. Background technique [0002] Free-form surface lighting design refers to designing a free-form surface according to the luminous characteristics of the light source and target illumination, so that the light from the light source is deflected by the free-form surface to produce predetermined illumination. It is based on the theory of non-imaging optics, with the design goals of pursuing the largest possible energy utilization rate, accurately controlling the beam distribution and effectively realizing complex illumination. The freeform surface has the advantages of flexible space layout and high design freedom, which can greatly simplify the structure of the optical system and greatly improve the performance of the lighting system. Therefore, the research on free-form...

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Problems solved by technology

However, in the design process of this method, the mapping relationship between the light source and the target lighting must be established. This mapping relationship usually does not satisfy the integrability condition, so only discontinuous free-form surfaces can be obtained, which is difficult to process.

Moreover, the lens designed by this method only contains one free-form surface, so it can only control the intensity of the beam, and cannot control the phase at the same time, and the control ability is relatively weak

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