CN-122018172-A - Conical mirror assembling and adjusting method and system

CN122018172ACN 122018172 ACN122018172 ACN 122018172ACN-122018172-A

Abstract

The invention discloses a conical lens assembling and adjusting method and a conical lens assembling and adjusting system, and belongs to the technical field of optical assembling and adjusting. The method comprises the steps of obtaining geometrical optical model and initial system wavefront aberration distribution data based on a cone lens set interference detection light path, obtaining a characteristic wavefront aberration coefficient by fitting the initial data, obtaining an adjustment amount according to a mapping relation between the coefficient and a preset quantity, adjusting the light path based on the adjustment amount, and iteratively adjusting the cone lens set until the wavefront aberration distribution meets the requirement. The system comprises a data acquisition unit, a fitting unit, a calculation unit and an adjustment unit, and the corresponding steps are respectively realized. The invention realizes the efficient and high-precision adjustment of the conical lens group through quantitative mapping relation and iterative adjustment, does not need complex pre-calibration, is suitable for batch adjustment scenes, and has remarkable engineering application value.

Inventors

LI ZHU
Tong Fuqi
LUO WEIZHOU
HAI KUO
ZANG ZHONGMING
CHEN YANG
HU ZONGYAN
GONG YU
MA SHAOXING

Assignees

中国工程物理研究院机械制造工艺研究所

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The conical mirror assembling and adjusting method is characterized by comprising the following steps of: S1, acquiring a geometrical optical model and initial system wavefront aberration distribution data based on a cone lens group interference detection light path; s2, fitting the initial system wavefront aberration distribution data to obtain a characteristic wavefront aberration coefficient; S3, acquiring an adjustment amount according to the characteristic wavefront aberration coefficient and a preset quantitative mapping relation; s4, adjusting the interference detection light path of the conical lens group based on the adjustment quantity; S5, iterative adjustment is carried out on the conical lens group, and the steps S2 to S4 are repeatedly executed until the system wavefront aberration distribution meets the preset use requirement.
2. The method for assembling and adjusting conical mirrors according to claim 1, wherein the conical mirror group is composed of two conical mirrors which are arranged at intervals, the combination form of the conical mirrors is two convex conical mirrors, two concave conical mirrors or the combination of one concave conical mirror and one convex conical mirror, The conical surfaces of the two conical mirrors are opposite or oppositely arranged.
3. The cone lens assembly adjusting method as claimed in claim 2, wherein the method for obtaining the geometrical-optical model in step S1 comprises: S1-1, acquiring actual data of the interference detection light path, wherein the actual data comprise material refractive indexes, base angles, thicknesses, relative pose and light transmission apertures of two conical mirrors; S1-2, building a geometrical optical model matched with an actual interference detection light path based on the actual data.
4. The cone lens assembling and adjusting method according to claim 2, wherein conical surface sagittal expressions of the two cone lenses are: , Wherein, the Is a sagittal view of the subject, In the form of a radial coordinate, The base angle of the concave conical mirror is positive, and the base angle of the convex conical mirror is negative.
5. The cone lens assembly adjustment method according to claim 2, wherein the adjustment amount is a spatial pose adjustment amount of the cone lens, and the spatial pose adjustment amount includes any one or more of translation of a single dimension of the cone lens, tilting of a single dimension of the cone lens, a combination of translations of multiple dimensions of the cone lens, and a combination of tilts of multiple dimensions of the cone lens.
6. The cone lens assembly adjusting method according to claim 5, wherein in the predetermined quantitative mapping relationship, the adjustment amounts and the characteristic wavefront aberration coefficients are in a one-to-one correspondence, and a specific adjustment amount only affects the corresponding characteristic wavefront aberration coefficient.
7. The cone lens assembly adjusting method according to claim 6, wherein the obtaining method expression of the preset quantitative mapping relation is: , Wherein a i is a characteristic wavefront aberration coefficient, j is a positive integer, N is an order, k is a dimension of the adjustment quantity, b is a coefficient solved by a geometric optical model, and x is the adjustment quantity.
8. The cone lens assembly adjustment method according to claim 1, wherein the characteristic wavefront aberration coefficients are obtained by fitting orthogonal Zernike polynomials in a circular light transmission aperture, and a fitting expression is: , Wherein, the Is the wave front aberration distribution in the circular light transmission caliber, In the form of a radial coordinate, In the form of an angular coordinate, the angular coordinate, For the number of Zernike polynomials, Is the first The term features the wavefront aberration coefficient, Is the first The term Zernike polynomials.
9. The cone lens assembly and adjustment method according to claim 1, wherein the cone lens set interference detection light path is built based on an aberration-free point method, and comprises an interferometer host, an interferometer transmission standard lens, a first cone lens, an adjusting mechanism, a second cone lens and a reflecting mirror, wherein a measuring light beam emitted by the interferometer returns from a primary path after being reflected by the reflecting mirror through the cone lens set, and forms interference fringes with a reference light beam, and wavefront aberration distribution data is obtained through calculation.
10. A conical mirror assembly adjustment system comprising a conical mirror assembly adjustment method according to any one of claims 1-9, the system comprising: the data acquisition unit is used for acquiring geometrical optical models and initial system wavefront aberration distribution data based on the interference detection light path of the conical lens group; The fitting unit is electrically connected with the data acquisition unit and is used for fitting the initial system wavefront aberration distribution data to obtain a characteristic wavefront aberration coefficient; the calculating unit is electrically connected with the fitting unit and is used for solving and obtaining the adjustment quantity according to the characteristic wavefront aberration coefficient and the preset quantity mapping relation; The adjusting unit is electrically connected with the calculating unit and is used for adjusting the interference detection light path of the conical lens group based on the adjustment quantity and performing iterative adjustment operation on the conical lens group until the system wavefront aberration distribution meets the preset use requirement.

Description

Conical mirror assembling and adjusting method and system Technical Field The invention relates to the technical field of optical adjustment, in particular to a conical lens assembling and adjusting method and a conical lens assembling and adjusting system. Background The hollow light beam has barrel-shaped intensity distribution and has wide application in the fields of glass-Einstein condensation, light capture, optical tweezers, holography and the like. Many methods of generating hollow beams have been proposed by researchers, including transverse mode converters, geometric optics, holographic techniques, computational holograms, hollow fibers, spatial filtering, and nonlinear interactions. Among them, the geometrical optical method based on the conical lens group can more easily and effectively generate high-quality hollow light beams. However, decentration or tilt misalignment in conical lens groups tends to produce indistinguishable wavefront aberration profiles, resulting in the traditional tuning methods being long-lasting and highly dependent on human experience. In addition, the space pose deviation which is difficult to avoid exists between the adjustment coordinate system and the adjustment coordinate system, and the manual adjustment efficiency is further reduced. In order to cope with challenges faced by the manual adjustment method, researchers have proposed various computer-aided adjustment methods, and high-precision adjustment is realized by constructing a specific mapping relation between wavefront aberration distribution and six-dimensional offset, and the method mainly comprises a sensitivity matrix method, an inverse optimization method, a differential wavefront method, an artificial neural network method and a vector aberration method. However, the method is generally based on a theoretical optical model, has high requirements on wavefront measurement precision and tuning precision, and has limited tuning efficiency in practical engineering application. Although the adjustment accuracy can be improved by measuring in advance the coordinate transformation matrix between the calibration adjustment coordinate system and the adjustment coordinate system, there are measurement errors, optical element surface shape errors, and adjustment errors which are difficult to avoid, so that the assembly adjustment of the conical mirror cannot be completed by a single adjustment. In addition, the surface shape errors and the installation errors of the optical elements in different batches are different, and the working efficiency of the measurement and calibration method is insufficient. At present, the related research on the assembly and adjustment of the conical lens is less, the traditional manual adjustment depends on manual experience, the efficiency is low, the requirements of the traditional computer-aided adjustment method on the wavefront measurement precision and the adjustment precision are higher, and the actual adjustment efficiency is low. Accordingly, the prior art is in need of improvement. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a conical lens assembling and adjusting method and a conical lens assembling and adjusting system, solves the technical problems of high requirements on assembling and adjusting precision and low assembling and adjusting efficiency of the conical lens, and realizes efficient and high-precision iterative assembling and adjusting of a conical lens group. The invention is realized by the following technical scheme: In a first aspect, the present invention provides a conical mirror assembly adjustment method, comprising the steps of: S1, acquiring a geometrical optical model and initial system wavefront aberration distribution data based on a cone lens group interference detection light path; s2, fitting the initial system wavefront aberration distribution data to obtain a characteristic wavefront aberration coefficient; S3, acquiring an adjustment amount according to the characteristic wavefront aberration coefficient and a preset quantitative mapping relation; s4, adjusting the interference detection light path of the conical lens group based on the adjustment quantity; S5, iterative adjustment is carried out on the conical lens group, and the steps S2 to S4 are repeatedly executed until the system wavefront aberration distribution meets the preset use requirement. Further, in the invention, the conical lens group is composed of two conical lenses which are arranged at intervals, the combination form of the conical lenses is two convex conical lenses, two concave conical lenses or the combination of one concave conical lens and one convex conical lens, The conical surfaces of the two conical mirrors are opposite or oppositely arranged. Further, in the present invention, the method for acquiring the geometric optical model in the step S1 includes: S1-1, acquiring actual data of the interference detection lig