P. Yu, Yiqiu Wang, Jingjing Yan, Jianping Chang, Youwei Tian
In this paper, through numerical simulation, the effect of initial phase on nonlinear Thomson scattering in a Gaussian laser pulse under tight focusing is studied. It is found for the first time that the initial phase is out of synchronization with the maximum radiation angle. When the initial phase changes from 360° to 180°, the maximum radiation distribution appears multi peak phenomenon, and the degree of the initial phase angle is different from that when the initial phase changes from 0 to 180 degrees., it shows an antisymmetric variation law. Furthermore, we discuss the process and reason of this phenomenon, which provides a accurate observation time and theoretical basis for high energy electron radiation experiment.
{"title":"Effect and mechanism of initial phase on electron radiation under linearly polarized Gaussian laser pulse","authors":"P. Yu, Yiqiu Wang, Jingjing Yan, Jianping Chang, Youwei Tian","doi":"10.1117/12.2600776","DOIUrl":"https://doi.org/10.1117/12.2600776","url":null,"abstract":"In this paper, through numerical simulation, the effect of initial phase on nonlinear Thomson scattering in a Gaussian laser pulse under tight focusing is studied. It is found for the first time that the initial phase is out of synchronization with the maximum radiation angle. When the initial phase changes from 360° to 180°, the maximum radiation distribution appears multi peak phenomenon, and the degree of the initial phase angle is different from that when the initial phase changes from 0 to 180 degrees., it shows an antisymmetric variation law. Furthermore, we discuss the process and reason of this phenomenon, which provides a accurate observation time and theoretical basis for high energy electron radiation experiment.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"54 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131923101","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}
L. Ji, A. M. Jadoon, Zhenyuan Lin, Yan Wu, Litian Zhang, Jincan Zheng
Third-generation semiconductor SiC has the advantages of large band gap, fast carrier saturation migration speed and high critical breakdown electric field strength. These characteristics make SiC based electronic devices modification technology an important research significance in the field of high-performance light-emitting devices, high power and high-frequency devices. However, due to wide bandgap and complex surface state of SiC, the regulation of its luminescent properties and fabrication of excellent Ohmic contact with SiC/metal interface are always difficult that significantly influence the working performance and development in SiC devices. In this paper, we introduce the mechanism of light-emission regulation in broad band of blue and ultraviolet/white light photoluminescence by high energy laser irradiation on SiC single crystal surface. Studies determine that surface modification mechanism of laserinduced C-atomic defect state for electrical transmission and improvement of electrical contact performance of SiC surface.
{"title":"Tuning of opto-electonic properties of SiC by laser irradiation","authors":"L. Ji, A. M. Jadoon, Zhenyuan Lin, Yan Wu, Litian Zhang, Jincan Zheng","doi":"10.1117/12.2602889","DOIUrl":"https://doi.org/10.1117/12.2602889","url":null,"abstract":"Third-generation semiconductor SiC has the advantages of large band gap, fast carrier saturation migration speed and high critical breakdown electric field strength. These characteristics make SiC based electronic devices modification technology an important research significance in the field of high-performance light-emitting devices, high power and high-frequency devices. However, due to wide bandgap and complex surface state of SiC, the regulation of its luminescent properties and fabrication of excellent Ohmic contact with SiC/metal interface are always difficult that significantly influence the working performance and development in SiC devices. In this paper, we introduce the mechanism of light-emission regulation in broad band of blue and ultraviolet/white light photoluminescence by high energy laser irradiation on SiC single crystal surface. Studies determine that surface modification mechanism of laserinduced C-atomic defect state for electrical transmission and improvement of electrical contact performance of SiC surface.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"5 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":"128684165","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}
Yufan Liu, Zifa Xu, Wentai Ouyang, Mina Zhang, Q. Zou, J. Jiao, Zheng Liu, Wenwu Zhang
Aiming at the problems of tool wear and poor consistency in the mechanical subtraction of Inconel718 nickel-based superalloy complex structural parts in the laser additive and subtractive manufacturing process. In this paper, the short pulse laser is used to perform precision subtractive processing of Inconel 718 superalloy continuous laser deposition manufacturing (LDM) parts. This paper focuses on the research of short pulse laser milling and scanning technology of Inconel718 LDM. Based on the Response Surface Method, the influence of process parameters such as scanning speed, hatch distance and scanning times on the shape accuracy of the inner channel, surface roughness, material removal rate and recast layer was explored. The optimal milling process parameters are obtained as follows: the laser power is 100 W, the scanning speed is 6000 mm / s, the scanning times are 800, and the hatch distance is 0.02 mm.
针对激光增材减材制造过程中Inconel718镍基高温合金复杂结构件机械减材存在刀具磨损和一致性差的问题。利用短脉冲激光对Inconel 718高温合金连续激光沉积加工(LDM)零件进行精密减模加工。本文主要研究了Inconel718 LDM的短脉冲激光铣削和扫描技术。基于响应面法，探讨了扫描速度、舱口距离、扫描次数等工艺参数对内通道形状精度、表面粗糙度、材料去除率和重铸层的影响。得到最佳铣削工艺参数为:激光功率为100 W，扫描速度为6000 mm / s，扫描次数为800次，舱口距离为0.02 mm。
{"title":"Parameters optimization of short pulse laser milling Inconel 718 laser deposition manufacturing parts","authors":"Yufan Liu, Zifa Xu, Wentai Ouyang, Mina Zhang, Q. Zou, J. Jiao, Zheng Liu, Wenwu Zhang","doi":"10.1117/12.2602596","DOIUrl":"https://doi.org/10.1117/12.2602596","url":null,"abstract":"Aiming at the problems of tool wear and poor consistency in the mechanical subtraction of Inconel718 nickel-based superalloy complex structural parts in the laser additive and subtractive manufacturing process. In this paper, the short pulse laser is used to perform precision subtractive processing of Inconel 718 superalloy continuous laser deposition manufacturing (LDM) parts. This paper focuses on the research of short pulse laser milling and scanning technology of Inconel718 LDM. Based on the Response Surface Method, the influence of process parameters such as scanning speed, hatch distance and scanning times on the shape accuracy of the inner channel, surface roughness, material removal rate and recast layer was explored. The optimal milling process parameters are obtained as follows: the laser power is 100 W, the scanning speed is 6000 mm / s, the scanning times are 800, and the hatch distance is 0.02 mm.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"92 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":"133800536","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}
Liwen Sheng, Jisong Yan, Lin Huang, M. Yuan, Qiao Shan, Zhang Aiguo, Jiaqing Liu, Li Ligong, F. Nian, Shuai Zhou
{"title":"Distributed Brillouin temperature sensing based on single-photon detector in optical fiber","authors":"Liwen Sheng, Jisong Yan, Lin Huang, M. Yuan, Qiao Shan, Zhang Aiguo, Jiaqing Liu, Li Ligong, F. Nian, Shuai Zhou","doi":"10.1117/12.2601785","DOIUrl":"https://doi.org/10.1117/12.2601785","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"3 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":"125120738","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}
Optical imaging through scattering media such as ground glass, fog, biological tissues, etc. has always been a widely used and challenging task in the optical field. Compared with traditional imaging methods such as transmission matrix and optical phase conjugation, deep learning has shown great potential in this field because of its simple device and fast reconstruction speed. In this article, we developed an algorithm based on convolutional neural network to realize imaging through scattering media and applied this algorithm to recover complex images. The speckle images of the original images are obtained through a speckle generation program, and then the speckle images and the original images are input into the neural network in pairs for training. Finally, the reconstructed speckle images can be obtained by using the trained neural network. In the numerical simulation, we proposed two indicators, peak signal-to-noise ratio (PSNR) and structural similarity (SSIM), to evaluate the quality of reconstructed images. The results show that our method can restore highfidelity images. This new image reconstruction method provides new ideas for research in the fields of astronomy and biomedicine.
{"title":"High fidelity image reconstruction of light passing through scattering medium based on convolutional neural network","authors":"Zhaoyang Tang, Chengchao Xiang, Qixin Liu, Yue Dai, Jiaqi He, Yingchun Ding","doi":"10.1117/12.2603144","DOIUrl":"https://doi.org/10.1117/12.2603144","url":null,"abstract":"Optical imaging through scattering media such as ground glass, fog, biological tissues, etc. has always been a widely used and challenging task in the optical field. Compared with traditional imaging methods such as transmission matrix and optical phase conjugation, deep learning has shown great potential in this field because of its simple device and fast reconstruction speed. In this article, we developed an algorithm based on convolutional neural network to realize imaging through scattering media and applied this algorithm to recover complex images. The speckle images of the original images are obtained through a speckle generation program, and then the speckle images and the original images are input into the neural network in pairs for training. Finally, the reconstructed speckle images can be obtained by using the trained neural network. In the numerical simulation, we proposed two indicators, peak signal-to-noise ratio (PSNR) and structural similarity (SSIM), to evaluate the quality of reconstructed images. The results show that our method can restore highfidelity images. This new image reconstruction method provides new ideas for research in the fields of astronomy and biomedicine.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"1 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":"130069218","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 scattering model of a single high-energy electron interacting with a Gaussian laser pulse is constructed according to the Lagrange’s equation, and the trajectory of the electron and the radiation characteristics of the scattered light are simulated by MATLAB, also, the influence of the initial position of the electron on the space energy radiation is discussed in detail. The results show that the initially static high-energy electron first oscillates in the +z direction in a plane, and then travels along a straight line after interacting with the linearly polarized tightly focused intense laser. As the initial position of the electron moves to the positive direction of z axis, the azimuth angle of the maximum energy radiation direction remains unchanged at 180°, while the polar angle gradually decreases and finally stabilizes at 20.5°. The maximum radiation energy in the whole space is obtained when the electron is initially set at (0,0,−7λ0 ) with the polar angle and the azimuth angle being 23.5° and 180° respectively, and the corresponding time evolution and spectrum of the process are discussed qualitatively.
{"title":"Influence of electron’s initial position on space radiation of a high-energy electron interacting with linearly polarized tightly focused laser","authors":"Xi Zhou, Yilv Yan, S. Ren, Hui Liu, Youwei Tian","doi":"10.1117/12.2600773","DOIUrl":"https://doi.org/10.1117/12.2600773","url":null,"abstract":"The scattering model of a single high-energy electron interacting with a Gaussian laser pulse is constructed according to the Lagrange’s equation, and the trajectory of the electron and the radiation characteristics of the scattered light are simulated by MATLAB, also, the influence of the initial position of the electron on the space energy radiation is discussed in detail. The results show that the initially static high-energy electron first oscillates in the +z direction in a plane, and then travels along a straight line after interacting with the linearly polarized tightly focused intense laser. As the initial position of the electron moves to the positive direction of z axis, the azimuth angle of the maximum energy radiation direction remains unchanged at 180°, while the polar angle gradually decreases and finally stabilizes at 20.5°. The maximum radiation energy in the whole space is obtained when the electron is initially set at (0,0,−7λ0 ) with the polar angle and the azimuth angle being 23.5° and 180° respectively, and the corresponding time evolution and spectrum of the process are discussed qualitatively.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"15 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":"129994795","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}
Huan Liu, Jing Ma, Gui-Min Chen, Hai-Ling He, Ya-Xian Fan, Z. Tao
Traditional biological detection methods in practical applications, such as polymerase chain reaction, fluorescence microscopy, flow cytometry and so on, are commonly limited by label needed, high cost, complex operation, low sensitivity. Fortunately, metamaterial-based terahertz (THz) biosensors have shown great potential in label-free, integrated chip and ultra-sensitive sensing due to their advantages in light collection and miniaturization. However, most of THz metamaterial biosensors are based on transmission spectrum measurement, the one-way transmission will lead to the weak interactions between analyte and THz wave, so the sensitivity will be greatly reduced. Here, we proposed a label-free dual-band THz biosensor with ultra-high sensitivity based on metamaterial absorber. The device consists of the asymmetric cross shaped metal metasurface, hollow sensing channel and a back reflector. The simulation results show that the two resonance modes are excited at 0.626 THz and 1.504 THz and the absorptivity is higher than 95%. With the increasing the refractive index of the analyte, the two absorption peaks have obvious red shift. The maximum sensitivities for mode A and mode B are up to 250 GHz/RIU and 630 GHz/RIU, respectively. By simulating the electromagnetic field distribution of the structure, the absorption sensing mechanism is discussed in detail. The proposed THz metamaterial biosensor exhibits promising applications in chemical and biological detection.
{"title":"Dual-band terahertz biosensor based on metamaterial absorber","authors":"Huan Liu, Jing Ma, Gui-Min Chen, Hai-Ling He, Ya-Xian Fan, Z. Tao","doi":"10.1117/12.2603109","DOIUrl":"https://doi.org/10.1117/12.2603109","url":null,"abstract":"Traditional biological detection methods in practical applications, such as polymerase chain reaction, fluorescence microscopy, flow cytometry and so on, are commonly limited by label needed, high cost, complex operation, low sensitivity. Fortunately, metamaterial-based terahertz (THz) biosensors have shown great potential in label-free, integrated chip and ultra-sensitive sensing due to their advantages in light collection and miniaturization. However, most of THz metamaterial biosensors are based on transmission spectrum measurement, the one-way transmission will lead to the weak interactions between analyte and THz wave, so the sensitivity will be greatly reduced. Here, we proposed a label-free dual-band THz biosensor with ultra-high sensitivity based on metamaterial absorber. The device consists of the asymmetric cross shaped metal metasurface, hollow sensing channel and a back reflector. The simulation results show that the two resonance modes are excited at 0.626 THz and 1.504 THz and the absorptivity is higher than 95%. With the increasing the refractive index of the analyte, the two absorption peaks have obvious red shift. The maximum sensitivities for mode A and mode B are up to 250 GHz/RIU and 630 GHz/RIU, respectively. By simulating the electromagnetic field distribution of the structure, the absorption sensing mechanism is discussed in detail. The proposed THz metamaterial biosensor exhibits promising applications in chemical and biological detection.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"18 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":"130439764","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}
Tengfei Wu, Linjie Lv, Jibo Han, Da-zhi Zhang, Zhiguo Liang
The Photon Doppler Velocimetry system is widely used in transient high-speed experiments, due to its advantages of non-contact measurement, low cost, high frequency response and good traceability. When the measured target accelerates from 0 to tens of km/s within a few hundred nanoseconds, its signal frequency can reach tens of GHz, so its dynamic range and time resolution capabilities are greatly challenged. The time-stretched Photon Doppler Velocimetry uses the time-stretched characteristics of pulsed lasers to achieve high-frequency signal scaling, improves the time resolution capability of the Photon Doppler Velocimetry, and breaks the Nyquist limit of analog-to-digital conversion technology. The article completes the experimental verification and system error analysis of the time-stretched Photon Doppler Velocimetry for the simulation study of the time-stretched Photon Doppler scale factor.
{"title":"Simulation of time-stretched photon Doppler velocimetry","authors":"Tengfei Wu, Linjie Lv, Jibo Han, Da-zhi Zhang, Zhiguo Liang","doi":"10.1117/12.2603239","DOIUrl":"https://doi.org/10.1117/12.2603239","url":null,"abstract":"The Photon Doppler Velocimetry system is widely used in transient high-speed experiments, due to its advantages of non-contact measurement, low cost, high frequency response and good traceability. When the measured target accelerates from 0 to tens of km/s within a few hundred nanoseconds, its signal frequency can reach tens of GHz, so its dynamic range and time resolution capabilities are greatly challenged. The time-stretched Photon Doppler Velocimetry uses the time-stretched characteristics of pulsed lasers to achieve high-frequency signal scaling, improves the time resolution capability of the Photon Doppler Velocimetry, and breaks the Nyquist limit of analog-to-digital conversion technology. The article completes the experimental verification and system error analysis of the time-stretched Photon Doppler Velocimetry for the simulation study of the time-stretched Photon Doppler scale factor.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"89 38 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":"129798056","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}
Photoacoustic imaging has gradually developed into a new and important imaging technology. As an important branch of photoacoustic imaging, optical-resolution photoacoustic microscopy combines the advantages of optical imaging and acoustic imaging, it has the advantages of high resolution, high contrast, high sensitivity and so on. However, in order to obtain high resolution, it is often necessary to focus the laser beam strongly, which will lead to the small depth of field and the inability to obtain large-scale structural information. However, in clinical diagnosis, doctors hope to obtain large-scale, high-resolution structural and functional information as much as possible, so it is of great significance to solve the problem of small depth of field in photoacoustic microscopy. Here, we proposed three-dimensional fusion for large volumetric optical-resolution photoacoustic microscopy. Firstly, two groups of virtual cerebral vascular 3D photoacoustic data obtained at different focal locations were obtained by using virtual photoacoustic microscopic imaging platform. Then, based on the multi-scale weight gradient fusion algorithm, the B-scan data of mouse cerebrovascular data were fused, and the maximum projection reduction was performed on the fused 3D data. Finally, the images before and after fusion were compared. Experimental results show that this algorithm can effectively obtain large volumetric and high-resolution photoacoustic images.
{"title":"Three-dimensional fusion for large volumetric optical-resolution photoacoustic microscopy","authors":"Xiongjun Cao, Zhihui Li, Xianlin Song","doi":"10.1117/12.2603388","DOIUrl":"https://doi.org/10.1117/12.2603388","url":null,"abstract":"Photoacoustic imaging has gradually developed into a new and important imaging technology. As an important branch of photoacoustic imaging, optical-resolution photoacoustic microscopy combines the advantages of optical imaging and acoustic imaging, it has the advantages of high resolution, high contrast, high sensitivity and so on. However, in order to obtain high resolution, it is often necessary to focus the laser beam strongly, which will lead to the small depth of field and the inability to obtain large-scale structural information. However, in clinical diagnosis, doctors hope to obtain large-scale, high-resolution structural and functional information as much as possible, so it is of great significance to solve the problem of small depth of field in photoacoustic microscopy. Here, we proposed three-dimensional fusion for large volumetric optical-resolution photoacoustic microscopy. Firstly, two groups of virtual cerebral vascular 3D photoacoustic data obtained at different focal locations were obtained by using virtual photoacoustic microscopic imaging platform. Then, based on the multi-scale weight gradient fusion algorithm, the B-scan data of mouse cerebrovascular data were fused, and the maximum projection reduction was performed on the fused 3D data. Finally, the images before and after fusion were compared. Experimental results show that this algorithm can effectively obtain large volumetric and high-resolution photoacoustic images.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"176 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":"124331794","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}
Mengmeng Wu, Ruimin Shi, Yinshen Qin, Jundong Ye, Qianmei Chen
When the optical fiber ring is used as interferometer in microwave photonics (MWP) filter, researchers usually pay much attention to the sensing sensitivity, but are lack of experimental research on the deterioration of sensing linearity caused by the noise in this structure. Therefore, this paper studies the deterioration of the temperature sensing linearity in MWP filter, which is caused by the noise in optical fiber ring structure. In experiment, a sinusoidal microwave signal with the radio frequency(RF) amplitude of 4Vpp and the frequency range of 127MHz -147MHz are selected to modulate the broad-band light, and the bias voltage of the electro-optic modulator(EOM) is 3V. In the experiment, the 50m sensing fiber is heated, with the temperature range of 25°C-55°C. The filtered microwave signal is realized by the beating process in photodiode(PD), and then the signal is sent to the electrical spectrum analyzer (ESA). When the RF sweeping curves are recorded, the maximum peak detection(MPD) method is used to extract the resonant frequency of two resonant peaks at different temperatures respectively. Finally, the mean values of these resonant frequencies are calculated, and the first and multiple order polynomial is used to fit the above data. These results show that the resonant frequencies corresponding to different resonant peaks vary with the temperature with poor linearity. The first order fitting R-square of the resonant peak 1 and peak 2 are only 0.3855 and 0.2545, while the quartic fitting R-square can reach 0.8583 and 0.9589. It can be seen that there is a large noise in the optical fiber ring structure, which seriously affects the sensing performance of the MWP filter.
{"title":"Research on the linearity degradation caused by noise in microwave photonic temperature sensor with fiber ring structure","authors":"Mengmeng Wu, Ruimin Shi, Yinshen Qin, Jundong Ye, Qianmei Chen","doi":"10.1117/12.2603173","DOIUrl":"https://doi.org/10.1117/12.2603173","url":null,"abstract":"When the optical fiber ring is used as interferometer in microwave photonics (MWP) filter, researchers usually pay much attention to the sensing sensitivity, but are lack of experimental research on the deterioration of sensing linearity caused by the noise in this structure. Therefore, this paper studies the deterioration of the temperature sensing linearity in MWP filter, which is caused by the noise in optical fiber ring structure. In experiment, a sinusoidal microwave signal with the radio frequency(RF) amplitude of 4Vpp and the frequency range of 127MHz -147MHz are selected to modulate the broad-band light, and the bias voltage of the electro-optic modulator(EOM) is 3V. In the experiment, the 50m sensing fiber is heated, with the temperature range of 25°C-55°C. The filtered microwave signal is realized by the beating process in photodiode(PD), and then the signal is sent to the electrical spectrum analyzer (ESA). When the RF sweeping curves are recorded, the maximum peak detection(MPD) method is used to extract the resonant frequency of two resonant peaks at different temperatures respectively. Finally, the mean values of these resonant frequencies are calculated, and the first and multiple order polynomial is used to fit the above data. These results show that the resonant frequencies corresponding to different resonant peaks vary with the temperature with poor linearity. The first order fitting R-square of the resonant peak 1 and peak 2 are only 0.3855 and 0.2545, while the quartic fitting R-square can reach 0.8583 and 0.9589. It can be seen that there is a large noise in the optical fiber ring structure, which seriously affects the sensing performance of the MWP filter.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"19 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":"121304216","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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