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Method for optimizing freeform surface optical system in combination with surface form and field-of-view optimization strategy

A technology of optical system and optimization method, which is applied in optics, optical components, instruments, etc., can solve the problems of lack of pertinence in aberration correction, and achieve the effect of improving optimization efficiency, fast optimization speed, and improved optimization speed

Active Publication Date: 2017-09-29
NANJING UNIV OF SCI & TECH
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Problems solved by technology

This method is mainly to analyze the aberration characteristics, but in the optimization process, the correction of aberrations is not targeted

Method used

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  • Method for optimizing freeform surface optical system in combination with surface form and field-of-view optimization strategy
  • Method for optimizing freeform surface optical system in combination with surface form and field-of-view optimization strategy
  • Method for optimizing freeform surface optical system in combination with surface form and field-of-view optimization strategy

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Embodiment 1

[0080]A free-form surface off-axis reflective optical system design method combining surface shape optimization and field of view optimization strategies, the method steps are as follows:

[0081] Step 1. Establish the initial structure of off-axis three counters:

[0082] Referring to the example of the off-axis three-mirror optical system, the initial structure is obtained by off-axis processing on the basis of the coaxial three-mirror optical system. It is an even-order aspheric surface, the secondary mirror is a spherical mirror, and the third mirror is a free-form surface characterized by XY polynomials.

[0083] Step 2. Structural constraints on the initial structure of the off-axis three-inverter:

[0084] Using the written macro language corresponding to the optical system to limit light occlusion, call it in the evaluation function, control the structure of the system, and obtain the initial structure and initial field of view 0°×3°.

[0085] Step 3. Under the struc...

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Abstract

The invention discloses a method for optimizing a freeform surface optical system in combination with a surface form and a field-of-view optimization strategy. The method uses the respective coefficients of a Zernike standard polynomial representing an optical system wave aberration as an evaluation basis, develops a optimization process by a successive approximation strategy combining surface form optimization and field of view optimization, and comprises steps of: firstly, selecting an initial small field of view, searching out the maximum item of system aberration targetedly in each optimization step according to an established XY polynomial and a polynomial relation model, selecting a corresponding XY polynomial item in the freeform surface as a new-added variable to optimize and balance the aberration, and synchronously adjusting the weight of each field of view according to the wave aberration rms values of respective fields of view of the system; after a structure satisfying a performance index is optimized and acquired within a small field of view range, gradually expanding the field of view and repeating the optimization steps until optical system structure parameters within all field of view range are obtained. The method has a large field of view, fast optimization speed, aberration pertinence and guidance.

Description

technical field [0001] The invention belongs to the field of optical design, and in particular relates to a free-form surface optical system optimization method combined with surface shape and field of view optimization strategies. Background technique [0002] The free-form surface off-axis reflective optical system design method is widely used to design off-axis reflective optical systems with free-form surfaces. In recent years, freeform off-axis reflective optical system design methods have made great progress. In order to realize an optical system with a large aperture and a large field of view, some freeform surface optical system design methods have been proposed, such as Zhu Jun et al., in "Design method of freeform off-axis reflective imaging systems with adirect construction process". The direct design method of curved surface off-axis reflective imaging system, and the correction of aberrations and aberrations proposed by Meng Qingyu in the article "Off-axis thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B17/06
Inventor 袁群姚艳霞高志山陈露窦沂蒙殷慧敏
Owner NANJING UNIV OF SCI & TECH
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