As an important technology for realizing national strategies such as intelligent manufacturing and industrial 4.0, digital twin (DT) has received great attention from scholars and enterprises. At present, it has been applied to vehicles, ships, spacecraft, satellite, machining process and other fields, but there is no research report in the field of optical manufacturing. Aiming at this problem, and taking the reflective optical systems as the object, the applications of DT were discussed from the lifecycle dimension, including design and development, manufacturing and assembly, operation, and maintenance, et al. On this basis, taking the construction of the optical DT model as an example, the modelling methods of machining error and assembly error were mainly studied, the applications of the DT in computer-aided alignment and active optics were discussed, which demonstrate the importance of DT technology in the manufacturing process of reflective optical systems.
{"title":"Assembly performance analysis of reflective optical systems based on digital twin","authors":"Wei Wu, Zhun Deng, Zirong Luo, Yuze Xu, J. Shang","doi":"10.1117/12.2604104","DOIUrl":"https://doi.org/10.1117/12.2604104","url":null,"abstract":"As an important technology for realizing national strategies such as intelligent manufacturing and industrial 4.0, digital twin (DT) has received great attention from scholars and enterprises. At present, it has been applied to vehicles, ships, spacecraft, satellite, machining process and other fields, but there is no research report in the field of optical manufacturing. Aiming at this problem, and taking the reflective optical systems as the object, the applications of DT were discussed from the lifecycle dimension, including design and development, manufacturing and assembly, operation, and maintenance, et al. On this basis, taking the construction of the optical DT model as an example, the modelling methods of machining error and assembly error were mainly studied, the applications of the DT in computer-aided alignment and active optics were discussed, which demonstrate the importance of DT technology in the manufacturing process of reflective optical systems.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116137772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Synthetic aperture is the mainstream structure of current astronomical telescopes. However, after the synthetic aperture telescope is deployed in orbit, there will remain tilt and piston error between adjacent segments, which will sharply deteriorate the imaging quality of the optical system. The traditional piston error detection method based on dispersed fringe sensor has the question that it is difficult to detect the piston error within one wavelength, and the detection accuracy is restricted by the detection range. The method in this paper constructs multiple monochromatic light channels by opening windows in different areas on the dispersed fringe pattern, calculating and obtaining the feature value in each window to form a feature vector. Then, the convolutional neural network is introduced to distinguish the feature vector to detect piston error. Among them, the training set construction method adopted in this paper only needs raw data in one wavelength to construct a training set covering the entire detection range. Through simulation, the method proposed in this paper achieves the detection range of [-208λ, 208λ] (λ=720nm), and regardless of the presence of noise, the root mean square value of the detection error does not exceed 17.7nm (0.027λmin, λmin=660nm).
{"title":"Large-range piston error detection technology based on dispersed fringe sensor","authors":"Pengfei Wang, Hui Zhao, Xiaopeng Xie, Yating Zhang, Chuang Li, XueWu Fan","doi":"10.1117/12.2604553","DOIUrl":"https://doi.org/10.1117/12.2604553","url":null,"abstract":"Synthetic aperture is the mainstream structure of current astronomical telescopes. However, after the synthetic aperture telescope is deployed in orbit, there will remain tilt and piston error between adjacent segments, which will sharply deteriorate the imaging quality of the optical system. The traditional piston error detection method based on dispersed fringe sensor has the question that it is difficult to detect the piston error within one wavelength, and the detection accuracy is restricted by the detection range. The method in this paper constructs multiple monochromatic light channels by opening windows in different areas on the dispersed fringe pattern, calculating and obtaining the feature value in each window to form a feature vector. Then, the convolutional neural network is introduced to distinguish the feature vector to detect piston error. Among them, the training set construction method adopted in this paper only needs raw data in one wavelength to construct a training set covering the entire detection range. Through simulation, the method proposed in this paper achieves the detection range of [-208λ, 208λ] (λ=720nm), and regardless of the presence of noise, the root mean square value of the detection error does not exceed 17.7nm (0.027λmin, λmin=660nm).","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114276951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tandem devices combining perovskite and silicon solar cells are promising candidates to achieve power conversion efficiencies above 30% at reasonable costs. However, it is rarely reported about the effect of surface recombination on tandem solar cells. In this paper, we analyze the influence of surface recombination on the performance of tandem cells. Simulations show surface recombination can reduce the cell’s open-circuit voltage (Voc), short-circuit current (Jsc), and efficiency. The efficiency of the tandem cell decreases with the increase of the surface recombination rate on the sub cells. The maximum efficiency of the tandem cell without surface recombination is 25.81%. When the recombination velocity of the silicon sub cell increases from 0 to 105 cm/s, the overall efficiency decreases to 13.96%. When the same surface recombination velocity is added to perovskite sub cell, the overall efficiency is 13.89%. When both the surface recombination velocity of perovskite and silicon are 105 cm/s, the efficiency of the tandem cell decreases to 13.42%. Therefore, the performances of the tandem cell are similar in the cases of single sub cell with surface recombination and both sub cells with surface recombination.
{"title":"Perovskite/silicon tandem solar cell: surface recombination analysis","authors":"Liyifei Xv, Yizhou He, Huiyi Zheng, Xiaowei Guo","doi":"10.1117/12.2605471","DOIUrl":"https://doi.org/10.1117/12.2605471","url":null,"abstract":"Tandem devices combining perovskite and silicon solar cells are promising candidates to achieve power conversion efficiencies above 30% at reasonable costs. However, it is rarely reported about the effect of surface recombination on tandem solar cells. In this paper, we analyze the influence of surface recombination on the performance of tandem cells. Simulations show surface recombination can reduce the cell’s open-circuit voltage (Voc), short-circuit current (Jsc), and efficiency. The efficiency of the tandem cell decreases with the increase of the surface recombination rate on the sub cells. The maximum efficiency of the tandem cell without surface recombination is 25.81%. When the recombination velocity of the silicon sub cell increases from 0 to 105 cm/s, the overall efficiency decreases to 13.96%. When the same surface recombination velocity is added to perovskite sub cell, the overall efficiency is 13.89%. When both the surface recombination velocity of perovskite and silicon are 105 cm/s, the efficiency of the tandem cell decreases to 13.42%. Therefore, the performances of the tandem cell are similar in the cases of single sub cell with surface recombination and both sub cells with surface recombination.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122182315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Circulating tumor cells (CTCs) are generally considered as seeds for metastases, serving as a clinical biomarker for cancer diagnosis and prognosis. However, they are difficult to detect due to their low content in the blood of cancer patients. Consequently detection of CTCs normally requires an antibody-mediated biological enrichment process, which is very time-consuming. In this work, we demonstrate an antibody-free, efficient, fast and cost-effective way of detecting CTCs. That is, CTCs are physically isolated by size using filtration, and subsequently characterized in an optical way via laser scanning. The filtered and stained blood sample, which is placed on a moving and spinning stage, is illuminated by a 405nm diode laser. Then the scattered optical signals are focused using an ellipsoidal mirror for a better photon collection. Eventually CTCs in the scanning image are identified and counted by the clustering algorithm. Our method has advantages in high efficiency and low cost, holding great promise for early diagnosis and prognosis prediction of cancer patients.
{"title":"Detecting circulating tumor cells via laser scanning","authors":"Chunjian Yang, Zhongjun Jiang, Songpo Guo","doi":"10.1117/12.2604957","DOIUrl":"https://doi.org/10.1117/12.2604957","url":null,"abstract":"Circulating tumor cells (CTCs) are generally considered as seeds for metastases, serving as a clinical biomarker for cancer diagnosis and prognosis. However, they are difficult to detect due to their low content in the blood of cancer patients. Consequently detection of CTCs normally requires an antibody-mediated biological enrichment process, which is very time-consuming. In this work, we demonstrate an antibody-free, efficient, fast and cost-effective way of detecting CTCs. That is, CTCs are physically isolated by size using filtration, and subsequently characterized in an optical way via laser scanning. The filtered and stained blood sample, which is placed on a moving and spinning stage, is illuminated by a 405nm diode laser. Then the scattered optical signals are focused using an ellipsoidal mirror for a better photon collection. Eventually CTCs in the scanning image are identified and counted by the clustering algorithm. Our method has advantages in high efficiency and low cost, holding great promise for early diagnosis and prognosis prediction of cancer patients.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129690036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Single crystal silicon (sc-Si) is a typical infrared optical material with good heat resistance and high infrared transmittance which is widely used in infrared optical systems , aerospace and other fields. However, due to the higher hardness and lower fracture toughness of this material, brittle fracture is very prone to occur during single-point diamond machining, resulting in poor surface finish and roughness. Hence, like ceramics, and composites, the machining of this alloy is considered as difficult-to-machining materials. Micro-laser-assisted machining (μ-LAM) method has become a promising solution in recent years to lessen cutting stress when materials that are considered difficult-to-machining, such as sc-Si and ZnSe are employed. This paper investigated the influence of input variables of μ-LAM on the machinability aspect of the sc-Si. The influence of cutting parameters on surface roughness in LAM is studied by orthogonal experiment, and optimal processing conditions are obtained. The second-order regression model of process parameters and surface roughness was established by response surface method. The results show that the change of cutting depth had little effect on surface roughness, the spindle speed and feed speed were main factors affecting the surface roughness. According to the 3D response surface, the interaction between different factors had a significant effect on surface roughness. The optimal combination of process conditions were a spindle speed of 4000rpm, a feed speed of 2mm/min and a cutting depth of 5μm.
{"title":"A study on the laser-assisted cutting of single crystal Si for optimal machining","authors":"Jie Kang, Yuankang Wang, Weisheng Yang, Wanqing Zhang, Ya-fei Liu, Boran Luan","doi":"10.1117/12.2605521","DOIUrl":"https://doi.org/10.1117/12.2605521","url":null,"abstract":"Single crystal silicon (sc-Si) is a typical infrared optical material with good heat resistance and high infrared transmittance which is widely used in infrared optical systems , aerospace and other fields. However, due to the higher hardness and lower fracture toughness of this material, brittle fracture is very prone to occur during single-point diamond machining, resulting in poor surface finish and roughness. Hence, like ceramics, and composites, the machining of this alloy is considered as difficult-to-machining materials. Micro-laser-assisted machining (μ-LAM) method has become a promising solution in recent years to lessen cutting stress when materials that are considered difficult-to-machining, such as sc-Si and ZnSe are employed. This paper investigated the influence of input variables of μ-LAM on the machinability aspect of the sc-Si. The influence of cutting parameters on surface roughness in LAM is studied by orthogonal experiment, and optimal processing conditions are obtained. The second-order regression model of process parameters and surface roughness was established by response surface method. The results show that the change of cutting depth had little effect on surface roughness, the spindle speed and feed speed were main factors affecting the surface roughness. According to the 3D response surface, the interaction between different factors had a significant effect on surface roughness. The optimal combination of process conditions were a spindle speed of 4000rpm, a feed speed of 2mm/min and a cutting depth of 5μm.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128282900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With its incomparable advantages over other motion capture technologies, the application of optical motion capture systems has become more and more extensive, and it has become a major technical means for obtaining motion data. This paper mainly studies the camera calibration and 3D reconstruction technology of the optical motion capture system based on the marker, and designs an optical motion data capture system, which describes the acquisition of three-dimensional motion data, as well as the processing and analysis of motion posture feature data. By summarizing the methods and techniques of camera calibration, marker point placement, and motion drive, it effectively solves the problems of data jitter, data point loss, motion distortion, etc. generated during the motion capture process.
{"title":"Construction of human motion optical capture system","authors":"Xi Luo, Kun Ma, Guofeng Cai","doi":"10.1117/12.2604683","DOIUrl":"https://doi.org/10.1117/12.2604683","url":null,"abstract":"With its incomparable advantages over other motion capture technologies, the application of optical motion capture systems has become more and more extensive, and it has become a major technical means for obtaining motion data. This paper mainly studies the camera calibration and 3D reconstruction technology of the optical motion capture system based on the marker, and designs an optical motion data capture system, which describes the acquisition of three-dimensional motion data, as well as the processing and analysis of motion posture feature data. By summarizing the methods and techniques of camera calibration, marker point placement, and motion drive, it effectively solves the problems of data jitter, data point loss, motion distortion, etc. generated during the motion capture process.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128735213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The large diameter and long focal length collimator can be used to measure the parallelism between the various optical axes of multi-axis photoelectric system. After moving, vibration or change of ambient temperature, the collimator components location will change, and its own parallelism will disorder. Outside the laboratory, it's difficult to recalibrate the disorder collimator. This will directly affect the reliability of the collimator measurement results. In this paper, a self-calibration method was proposed, the collimator structure was optimized, CCD detection imaging was introduced and self-calibration component was designed. The radial calibration and depth of focus calibration principles were studied in collimator. Based on this, a set of collimator will be developed, which can measure the optical axis parallelism and its own parallelism included. When the collimator own parallelism disorders in the use of an external field, it's easier to finish the self-calibration in the scene. The measurement accuracy of the instrument can be ensured. A set of sun fleck positioning system software will be programmed, and it can be used to coordinate with self-calibration and measuring the optical axis parallelism function in the collimator. The study in this paper has important practical significance for scientific research and engineering experiments.
{"title":"Study on the self-calibration technology used in large diameter and long focal length collimator","authors":"Cheng Yang, Xinmei Yang, Zhengfei Li","doi":"10.1117/12.2604502","DOIUrl":"https://doi.org/10.1117/12.2604502","url":null,"abstract":"The large diameter and long focal length collimator can be used to measure the parallelism between the various optical axes of multi-axis photoelectric system. After moving, vibration or change of ambient temperature, the collimator components location will change, and its own parallelism will disorder. Outside the laboratory, it's difficult to recalibrate the disorder collimator. This will directly affect the reliability of the collimator measurement results. In this paper, a self-calibration method was proposed, the collimator structure was optimized, CCD detection imaging was introduced and self-calibration component was designed. The radial calibration and depth of focus calibration principles were studied in collimator. Based on this, a set of collimator will be developed, which can measure the optical axis parallelism and its own parallelism included. When the collimator own parallelism disorders in the use of an external field, it's easier to finish the self-calibration in the scene. The measurement accuracy of the instrument can be ensured. A set of sun fleck positioning system software will be programmed, and it can be used to coordinate with self-calibration and measuring the optical axis parallelism function in the collimator. The study in this paper has important practical significance for scientific research and engineering experiments.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130650190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ming-zhuang Zhang, Shi-jie Zhao, Liang Tian, R. Xie
Based on the motion mechanism of double-sided polishing, the motion trajectory model of polishing pad relative to medium-aperture optical components was established. This research simulated the trajectory of the abrasive particle relative to the optical component, and then the trajectory was obtained under different processing parameters. Based on the simulation results, different processing parameters were optimized which had been used for double-sided polishing experiments of optical components. The surface roughness and figure of both sides of the optical component after double-sided polishing were detected. The detection results showed that the surface roughness approached 0.5nmRMS, and the surface figure was 0.5λ(λ=632.8nm) for 150mm×150mm×7mm specification medium-aperture optical components.
{"title":"Investigation on surface figure control technology of medium-aperture optical component based on double-sided polishing","authors":"Ming-zhuang Zhang, Shi-jie Zhao, Liang Tian, R. Xie","doi":"10.1117/12.2604933","DOIUrl":"https://doi.org/10.1117/12.2604933","url":null,"abstract":"Based on the motion mechanism of double-sided polishing, the motion trajectory model of polishing pad relative to medium-aperture optical components was established. This research simulated the trajectory of the abrasive particle relative to the optical component, and then the trajectory was obtained under different processing parameters. Based on the simulation results, different processing parameters were optimized which had been used for double-sided polishing experiments of optical components. The surface roughness and figure of both sides of the optical component after double-sided polishing were detected. The detection results showed that the surface roughness approached 0.5nmRMS, and the surface figure was 0.5λ(λ=632.8nm) for 150mm×150mm×7mm specification medium-aperture optical components.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123816329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ke Li, Dezi Li, L. Gao, Zuquan Weng, Mingjie Zheng, Youwu He, Zhifang Li
Optical coherence tomography (OCT) is a biomedical imaging technology that uses interference information generated by two light waves to measure and evaluate biological tissues. Because of its high sensitivity, high resolution, and non-destructive testing, it is widely used in various fields. In this paper, OCT is used to detect and evaluate the reproduction of the three bacteria. At the same time, we also use a 20-fold objective lens to observe the morphology of the three bacteria at the position of the sample arm of the OCT. In the experiment, three groups of experimental data were collected, which were pictures collected after two hours, four hours, and five hours of bacterial culture. From the experimental data, the morphology and colony reproduction changes of the three bacteria can be observed; after 4 hours of reproduction, the morphology of E. coli and aeruginosa can be observed; Morphological structure of the three bacteria could be observed after 5 hours of reproduction; through the three-dimensional reconstruction of the experimental data, the three-dimensional morphology of the bacteria can be seen more clearly, which is more conducive to the identification of bacterial species. Experimental results show that OCT can be used to detect bacterial organisms on the order of micrometers, and can observe the reproduction process and morphology of bacteria in different periods, to identify bacterial species. This is of great help in the non-invasive identification of bacterial types in clinical applications of biomedicine.
{"title":"Application of optical coherence tomography for morphological change of Staphylococcus during reproduction","authors":"Ke Li, Dezi Li, L. Gao, Zuquan Weng, Mingjie Zheng, Youwu He, Zhifang Li","doi":"10.1117/12.2604723","DOIUrl":"https://doi.org/10.1117/12.2604723","url":null,"abstract":"Optical coherence tomography (OCT) is a biomedical imaging technology that uses interference information generated by two light waves to measure and evaluate biological tissues. Because of its high sensitivity, high resolution, and non-destructive testing, it is widely used in various fields. In this paper, OCT is used to detect and evaluate the reproduction of the three bacteria. At the same time, we also use a 20-fold objective lens to observe the morphology of the three bacteria at the position of the sample arm of the OCT. In the experiment, three groups of experimental data were collected, which were pictures collected after two hours, four hours, and five hours of bacterial culture. From the experimental data, the morphology and colony reproduction changes of the three bacteria can be observed; after 4 hours of reproduction, the morphology of E. coli and aeruginosa can be observed; Morphological structure of the three bacteria could be observed after 5 hours of reproduction; through the three-dimensional reconstruction of the experimental data, the three-dimensional morphology of the bacteria can be seen more clearly, which is more conducive to the identification of bacterial species. Experimental results show that OCT can be used to detect bacterial organisms on the order of micrometers, and can observe the reproduction process and morphology of bacteria in different periods, to identify bacterial species. This is of great help in the non-invasive identification of bacterial types in clinical applications of biomedicine.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134525051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaohong Wei, Kaiyuan Xu, Ang Liu, Qiang Li, Liqun Chai
Mid-spatial frequency errors can lead to self-focusing and power loss in a high-power laser. This paper describes the use of a binary phase computer generated hologram (CGH) to measure the mid-frequency wavefront of lens with long focallength. Thus, the designed CGH can provide reference aspheric wavefront with high-precision, in the meantime greatly shorten air space, thereby reducing the effect of vibration and air turbulence. Moreover, the use of power spectral density (PSD), structure function (SF) and autocorrelation function (ACF) for the specification and characterization of lens midfrequency wavefront are presented. The direct relationship between PSD, SF and ACF are analysed by the quantitative evaluation of the wavefront aberration. Analysis of different evaluation method help to understand the light transmission characteristics, and the area structure function and autocorrelation function can be complementary methods for specifying and representing the spatial content of optical surface errors.
{"title":"Fizeau interferometry with computer generated hologram for mid-spatial wavefront measurement of lens with long focal length","authors":"Xiaohong Wei, Kaiyuan Xu, Ang Liu, Qiang Li, Liqun Chai","doi":"10.1117/12.2604838","DOIUrl":"https://doi.org/10.1117/12.2604838","url":null,"abstract":"Mid-spatial frequency errors can lead to self-focusing and power loss in a high-power laser. This paper describes the use of a binary phase computer generated hologram (CGH) to measure the mid-frequency wavefront of lens with long focallength. Thus, the designed CGH can provide reference aspheric wavefront with high-precision, in the meantime greatly shorten air space, thereby reducing the effect of vibration and air turbulence. Moreover, the use of power spectral density (PSD), structure function (SF) and autocorrelation function (ACF) for the specification and characterization of lens midfrequency wavefront are presented. The direct relationship between PSD, SF and ACF are analysed by the quantitative evaluation of the wavefront aberration. Analysis of different evaluation method help to understand the light transmission characteristics, and the area structure function and autocorrelation function can be complementary methods for specifying and representing the spatial content of optical surface errors.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"22 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132835457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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