Color-separated focal position adjustable diffraction optical element and design method thereof
A diffractive optical element and design method technology, applied in the field of optics, can solve problems such as limited material selection and complex processing technology, and achieve the effects of universal application of calculation, simple physical model, and reduced production cost
Active Publication Date: 2017-02-22
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology
First: different polycrystalline materials require strict lattice matching in the process of stacking, the processing technology is complex, and cause great restrictions on the selection of materials; second: strict current matching is required between series sub-cells
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[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] The inventors of the present application found that Chinese Invention Patent Application No. 201110351978.9 proposes a design method for diffractive optical elements purely based on diffraction theory, which has problems such as complex calculation, time-consuming, and may be affected by initial assignment. In fact, in the field of conventional optical element design, there are already some mature design methods that can obtain conventional optical elements with relatively satisfactory optical functions, such as conventional focusing lenses for focusing multi-wavelength incident light. The inventors have further found that, on the one hand, these existing conventional optical elements can be directly transformed in some cases; on the other hand, using the mature and reliable design achievements and As a result, it is also possi...
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The invention provides a color-separated focal position adjustable diffraction optical element and a design method thereof, and relates to the field of optics. The design method comprises the following steps: for each wavelength, acquiring an equivalent modulation thickness of a corresponding wavelength according to the thickness of a focal length at a current sampling point; respectively adding the thickness of an optical grating at the current sampling point to a plurality of equivalent modulation thicknesses so as to acquire a plurality of initial modulation thicknesses, wherein the optical grating is a blazed grating corresponding to each wavelength, different prism angles are designed for different wavelengths by the optical gratings, and the value of each prism angle is acquired according to the focal position of each wavelength; and confirming a design modulation thickness of a corresponding sampling point of a single piece type diffraction optical element according to the plurality of initial modulation thicknesses by using a thickness optimization algorithm. The diffraction optical element provided by the invention is simple in physical model and rapid in calculation and is universally applicable, the optical focusing efficiency can be improved, and color-separated focusing positions can be regulated and controlled on an output plane randomly.
Description
technical field [0001] The invention relates to the field of optics, in particular to a diffractive optical element with adjustable focus position for color separation and a design method thereof. Background technique [0002] As an important carrier for solar energy utilization, solar cells use photovoltaic materials to absorb sunlight and convert light energy into electrical energy. Each photovoltaic cell has its specific spectral response, mainly determined by the photovoltaic material itself. When the energy of the incident photon is greater than the energy band gap of the photovoltaic material, the energy band gap converts part of the light energy into charge carriers, and the energy beyond the energy band gap will be consumed in the form of heat; when the energy of the incident photon is less than the energy band gap of the photovoltaic material When the energy band gap is low, the incident photon cannot be absorbed by the material, and the conversion efficiency is ze...
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IPC IPC(8): G02B5/18G02B27/00
CPCG02B5/1828G02B5/1857G02B27/0012
Inventor 杨国桢叶佳声张岩徐文琪孟庆波林冬风许信
Owner CAPITAL NORMAL UNIVERSITY