Since the disadvantages of destructive and high cost for the traditional detection methods, a non-invasive identification method based on near infrared spectroscopy was used in this paper. The near infrared spectra of 120 groups of training blood samples and 30 groups of test samples were obtained from 4000cm-1 to 10000cm-1 for four kinds of animal blood and two kinds of fake blood. The classification and identification of blood can’t be easily achieved because of the near infrared spectra overlapping. To accurately identify the different kinds of the blood, back propagation (BP) neural network was used to establish the classification model. The spectra in full wavelengths were used as the input data, and 1, 2, 3, 4, 5, 6 were used to label different blood. Based on the training of 120 groups of training blood samples, the correct rate of blood identification for 30 groups of test samples are 66.7%. To further improve the correct rate, the weights of BP neural network were optimized by the particle swarm optimization (PSO). The effects of neurons number, learn rate factor, iteration times, and training times on the correct rate and mean square error for the identification of blood based on BP-PSO algorithm were investigated. Under the optimized parameters, the correct rate was improved to 96.7%.
{"title":"Blood identification of NIR spectroscopy based on BP neural network combined with particle swarm optimization","authors":"Z. Ren, Tao Liu","doi":"10.1117/12.2602388","DOIUrl":"https://doi.org/10.1117/12.2602388","url":null,"abstract":"Since the disadvantages of destructive and high cost for the traditional detection methods, a non-invasive identification method based on near infrared spectroscopy was used in this paper. The near infrared spectra of 120 groups of training blood samples and 30 groups of test samples were obtained from 4000cm-1 to 10000cm-1 for four kinds of animal blood and two kinds of fake blood. The classification and identification of blood can’t be easily achieved because of the near infrared spectra overlapping. To accurately identify the different kinds of the blood, back propagation (BP) neural network was used to establish the classification model. The spectra in full wavelengths were used as the input data, and 1, 2, 3, 4, 5, 6 were used to label different blood. Based on the training of 120 groups of training blood samples, the correct rate of blood identification for 30 groups of test samples are 66.7%. To further improve the correct rate, the weights of BP neural network were optimized by the particle swarm optimization (PSO). The effects of neurons number, learn rate factor, iteration times, and training times on the correct rate and mean square error for the identification of blood based on BP-PSO algorithm were investigated. Under the optimized parameters, the correct rate was improved to 96.7%.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127613028","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}
X. Qi, Yang Yu, Yudong Lian, Yulei Wang, Zhiwei Lu
A 37-core optical fiber with 14 air holes is proposed in this paper. This optical fiber can transmit the fundamental mode and part of the second mode. Effects of structure parameters on effective refractive index, bending loss and effective area of the fundamental mode HE11 and the second-order mode HE21 are investigated systematically. By adjusting the structure parameters, at wavelength of 1550 nm and bending radius of 5 cm, the effective mode field area of the fundamental mode is 1776.289 μm2 , and the bending loss is 4.656×10-5 dB/m. Due to the flexibility of multi-core structure, it is significant for theoretical research and practical manufacturing.
{"title":"Fourteen-core dual-mode fiber with low bending loss and large mode area","authors":"X. Qi, Yang Yu, Yudong Lian, Yulei Wang, Zhiwei Lu","doi":"10.1117/12.2603122","DOIUrl":"https://doi.org/10.1117/12.2603122","url":null,"abstract":"A 37-core optical fiber with 14 air holes is proposed in this paper. This optical fiber can transmit the fundamental mode and part of the second mode. Effects of structure parameters on effective refractive index, bending loss and effective area of the fundamental mode HE11 and the second-order mode HE21 are investigated systematically. By adjusting the structure parameters, at wavelength of 1550 nm and bending radius of 5 cm, the effective mode field area of the fundamental mode is 1776.289 μm2 , and the bending loss is 4.656×10-5 dB/m. Due to the flexibility of multi-core structure, it is significant for theoretical research and practical manufacturing.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131312809","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}
Edges are critical important for the visual appearance of images. The traditional denoising algorithms are difficult to preserve the edges of the image while removing the noise of ICCD sensing image. At the same time, it is difficult to eliminate the problems of image darkness and low resolution caused by uneven illumination. This paper proposes a multilevel filtering image denoising algorithm based on edge information fusion. The target edges detection of the image after non-local means (NL-means) filtering is carried out based on the eight-direction Sobel operator. In order to filter the false edge points and residual noise, an adaptive threshold is determined according to the mean and variance of the eight neighborhood pixels of the detected pixel. Meanwhile, homomorphic filtering is used to enhance the image contrast and uniformity. By comparing the pixel values of the edge image and the homomorphic filtered image, the final denoised image is obtained by fusing the two images. The results indicate that, compared with the traditional algorithms, the edge preserving ability of the proposed algorithm is improved by more than 20%, and the denoising ability is improved by 63.5% for building target. For specific targets (vehicle), the results demonstrate that the proposed algorithm have the maximum edge preserving index and contrast, and the minimum non-uniformity. This algorithm lays a foundation for target segmentation and recognition.
{"title":"Multilevel filtering image denoising algorithm based on edge information fusion","authors":"Xin Zhang, Jianfeng Sun, Peng Jiang, Xin Zhou, Changrui Qiu, Yinbo Zhang, Zhang Hailong","doi":"10.1117/12.2601816","DOIUrl":"https://doi.org/10.1117/12.2601816","url":null,"abstract":"Edges are critical important for the visual appearance of images. The traditional denoising algorithms are difficult to preserve the edges of the image while removing the noise of ICCD sensing image. At the same time, it is difficult to eliminate the problems of image darkness and low resolution caused by uneven illumination. This paper proposes a multilevel filtering image denoising algorithm based on edge information fusion. The target edges detection of the image after non-local means (NL-means) filtering is carried out based on the eight-direction Sobel operator. In order to filter the false edge points and residual noise, an adaptive threshold is determined according to the mean and variance of the eight neighborhood pixels of the detected pixel. Meanwhile, homomorphic filtering is used to enhance the image contrast and uniformity. By comparing the pixel values of the edge image and the homomorphic filtered image, the final denoised image is obtained by fusing the two images. The results indicate that, compared with the traditional algorithms, the edge preserving ability of the proposed algorithm is improved by more than 20%, and the denoising ability is improved by 63.5% for building target. For specific targets (vehicle), the results demonstrate that the proposed algorithm have the maximum edge preserving index and contrast, and the minimum non-uniformity. This algorithm lays a foundation for target segmentation and recognition.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133805279","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}
Yiqiu Wang, J. Zhuang, Qinyan Zhou, Yu Cai, Youwei Tian
Nonlinear Thomson scattering in intense (𝑎0 = 6) single-cycle (𝐿0 = 1𝜇𝑚) Gaussian laser pulse is investigated theoretically and numerically that demonstrates varied spatial characteristics in the tightly focused (𝑏0 = 3𝜇𝑚) regime. In the above ultrashort laser pulse, the electron has the potential to radiate single attosecond pulse with almost infinite SNR which is highly robust to varied initial phases. Furthermore, a novel symmetry degradation phenomenon in the tightly focused domain is firstly discovered, where the fourfold symmetric spatial radiation pattern in non-tightly focused pulses respectively degrades to plane/linear symmetry radiation pattern in the spherical projected/polarized plane. While spatial radiation is highly sensitive to initial phases, we remarkably find that the difference of peak radiation’s polar angles 𝜙m exactly equals to that of incident laser’s initial phases 𝜙0, indicating the initial phase has phase/angle shift effect on the electron’s spatial motion and radiation. With numerical analysis, the sampling results demonstrate that peak radiation’s polar angle 𝜃m and the difference 𝜙m = 𝜙0 are constant regardless of initial phases.
{"title":"Spatial characteristics of nonlinear Thomson scattering from tightly focused single-cycle laser pulse with varied initial phases","authors":"Yiqiu Wang, J. Zhuang, Qinyan Zhou, Yu Cai, Youwei Tian","doi":"10.1117/12.2600757","DOIUrl":"https://doi.org/10.1117/12.2600757","url":null,"abstract":"Nonlinear Thomson scattering in intense (𝑎0 = 6) single-cycle (𝐿0 = 1𝜇𝑚) Gaussian laser pulse is investigated theoretically and numerically that demonstrates varied spatial characteristics in the tightly focused (𝑏0 = 3𝜇𝑚) regime. In the above ultrashort laser pulse, the electron has the potential to radiate single attosecond pulse with almost infinite SNR which is highly robust to varied initial phases. Furthermore, a novel symmetry degradation phenomenon in the tightly focused domain is firstly discovered, where the fourfold symmetric spatial radiation pattern in non-tightly focused pulses respectively degrades to plane/linear symmetry radiation pattern in the spherical projected/polarized plane. While spatial radiation is highly sensitive to initial phases, we remarkably find that the difference of peak radiation’s polar angles 𝜙m exactly equals to that of incident laser’s initial phases 𝜙0, indicating the initial phase has phase/angle shift effect on the electron’s spatial motion and radiation. With numerical analysis, the sampling results demonstrate that peak radiation’s polar angle 𝜃m and the difference 𝜙m = 𝜙0 are constant regardless of initial phases.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115626183","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}
{"title":"Front Matter: Volume 11907","authors":"","doi":"10.1117/12.2605291","DOIUrl":"https://doi.org/10.1117/12.2605291","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114488012","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}
Chen Yuan, Hai-tao Wang, Jiajia Wang, Bin Wang, Wenwu Zhang
As a new type of composite processing technology, coaxial water-jet assisted laser drilling (CWALD) has significant advantages in improving the surface quality of micro-holes compared with traditional laser processing. The filling drilling of the DD6 super alloy was carried out by a coaxial water-jet assisted pulsed nanosecond laser. The effects of laser pumping current, laser frequency, and water-jet velocity on the surface quality of micro-holes were studied by response surface methodology (RSM). The results of confocal microscope observation have shown that the surface quality of micro-holes decreases significantly with the increase of laser average power and laser frequency, and increases with the increase of water-jet velocity. This paper expounds on the causes of surface quality defects of micro-holes and uses the optimized process parameters to process micro-holes with low surface line roughness and good roundness.
{"title":"Experimental study of surface quality during coaxial water-jet assisted nanosecond laser drilling","authors":"Chen Yuan, Hai-tao Wang, Jiajia Wang, Bin Wang, Wenwu Zhang","doi":"10.1117/12.2603059","DOIUrl":"https://doi.org/10.1117/12.2603059","url":null,"abstract":"As a new type of composite processing technology, coaxial water-jet assisted laser drilling (CWALD) has significant advantages in improving the surface quality of micro-holes compared with traditional laser processing. The filling drilling of the DD6 super alloy was carried out by a coaxial water-jet assisted pulsed nanosecond laser. The effects of laser pumping current, laser frequency, and water-jet velocity on the surface quality of micro-holes were studied by response surface methodology (RSM). The results of confocal microscope observation have shown that the surface quality of micro-holes decreases significantly with the increase of laser average power and laser frequency, and increases with the increase of water-jet velocity. This paper expounds on the causes of surface quality defects of micro-holes and uses the optimized process parameters to process micro-holes with low surface line roughness and good roundness.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114767194","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}
Lulu Zhang, Youshuo Cui, Zikai Dong, J. Tian, Yanrong Song
Q-switched Yb-doped fiber lasers based on 2H-MoTe2 was demonstrated in this paper. The saturable absorber (SA) was a film mixed by 2H-MoTe2 and polyvinyl alcohol (PVA). The modulation depth of the SA was 21.4% and the saturable optical intensity was 10.3 GW/cm-2. When the 2H-MoTe2 film was inserted into the cavity, the Q-switched pulses were obtained. To the best of our knowledge, this is the first time to realize the generation of Q-switching in a Yb-doped fiber laser based on 2H-MoTe2-PVA film.
{"title":"2H-MoTe2-based passively Q-switched ytterbium-doped fiber laser","authors":"Lulu Zhang, Youshuo Cui, Zikai Dong, J. Tian, Yanrong Song","doi":"10.1117/12.2603149","DOIUrl":"https://doi.org/10.1117/12.2603149","url":null,"abstract":"Q-switched Yb-doped fiber lasers based on 2H-MoTe2 was demonstrated in this paper. The saturable absorber (SA) was a film mixed by 2H-MoTe2 and polyvinyl alcohol (PVA). The modulation depth of the SA was 21.4% and the saturable optical intensity was 10.3 GW/cm-2. When the 2H-MoTe2 film was inserted into the cavity, the Q-switched pulses were obtained. To the best of our knowledge, this is the first time to realize the generation of Q-switching in a Yb-doped fiber laser based on 2H-MoTe2-PVA film.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128982225","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 free space optical communication system will inevitably be affected by atmospheric turbulence when working, which will increase the bit error rate at the receiving end, and seriously affects the communication quality, so it is necessary to analyze the characteristics of atmospheric turbulence. In the paper, the powerful feature extraction and data processing capabilities of the convolutional neural network is used to estimate the atmospheric turbulence refractive index structure constant C2n , and the influence of transmission distance, beam multiplexing technology and beam mode is analyzed on the estimation effect. The results show that this method can effectively estimate C2n , and the error can be controlled within a reasonable range.
{"title":"Estimation of atmospheric turbulence intensity based on deep learning","authors":"Shengjie Ma, Shiqi Hao, Qingsong Zhao, Chenlu Xu","doi":"10.1117/12.2603106","DOIUrl":"https://doi.org/10.1117/12.2603106","url":null,"abstract":"The free space optical communication system will inevitably be affected by atmospheric turbulence when working, which will increase the bit error rate at the receiving end, and seriously affects the communication quality, so it is necessary to analyze the characteristics of atmospheric turbulence. In the paper, the powerful feature extraction and data processing capabilities of the convolutional neural network is used to estimate the atmospheric turbulence refractive index structure constant C2n , and the influence of transmission distance, beam multiplexing technology and beam mode is analyzed on the estimation effect. The results show that this method can effectively estimate C2n , and the error can be controlled within a reasonable range.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132256043","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 Yang, Yuede Yang, Youzeng Hao, Jiliang Wu, Jia-Chen Liu, J. Xiao, Yongzhen Huang
We report nonlinear dynamics in directly connected twin circular-sided square microcavity semiconductor lasers with mutual optical injection. Rich nonlinear dynamics including injection locking, four-wave fixing, and multi-period oscillation states are observed experimentally by adjusting the mode frequency offset between two circular-side square microcavities. Internal optical injection or mode coupling can be realized directly in the connected twin circular-sided square microcavity lasers, which effectively relaxes device processing techniques of the integrated microcavities for photonic integration.
{"title":"Nonlinear dynamics in direct-connected twin circular-sided square microcavity lasers with mutual optical injection","authors":"Ke Yang, Yuede Yang, Youzeng Hao, Jiliang Wu, Jia-Chen Liu, J. Xiao, Yongzhen Huang","doi":"10.1117/12.2603026","DOIUrl":"https://doi.org/10.1117/12.2603026","url":null,"abstract":"We report nonlinear dynamics in directly connected twin circular-sided square microcavity semiconductor lasers with mutual optical injection. Rich nonlinear dynamics including injection locking, four-wave fixing, and multi-period oscillation states are observed experimentally by adjusting the mode frequency offset between two circular-side square microcavities. Internal optical injection or mode coupling can be realized directly in the connected twin circular-sided square microcavity lasers, which effectively relaxes device processing techniques of the integrated microcavities for photonic integration.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130284242","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}
{"title":"Experimental research on pedestrian detection using LiDAR","authors":"Chunxiao Wang, Zhu Jingguo, Tianpeng Xie, Can Zhang, Zhengyu Zhang, Yuyang Zhao","doi":"10.1117/12.2603162","DOIUrl":"https://doi.org/10.1117/12.2603162","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127900758","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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