The interworking between different networks can be effectively realized by implementing all-optical format conversion, and it can improve the flexibility, efficiency and expansibility of the communication system. The all-optical signal processing scheme is only carried out in the optical domain, and it does not require optical-electric-optical (O-E-O) conversion, which greatly improves the transmission rate and processing speed of the communication system. In this paper, an all-optical format conversion scheme from dual-polarization on-off keying (DP-OOK) to quadrature phase shift keying (QPSK) is proposed. The scheme is based on vector phase-sensitive amplification (PSA). Constellation and eye diagram of signals at each stage of system are obtained by simulation, and BER and EVM are calculated to show the performance of the system.
{"title":"DP-OOK to QPSK conversion based on vector phase-sensitive amplification bridging core and access networks","authors":"Zhaoyang Liu, Jiabin Cui, Yuefeng Ji","doi":"10.1117/12.3007642","DOIUrl":"https://doi.org/10.1117/12.3007642","url":null,"abstract":"The interworking between different networks can be effectively realized by implementing all-optical format conversion, and it can improve the flexibility, efficiency and expansibility of the communication system. The all-optical signal processing scheme is only carried out in the optical domain, and it does not require optical-electric-optical (O-E-O) conversion, which greatly improves the transmission rate and processing speed of the communication system. In this paper, an all-optical format conversion scheme from dual-polarization on-off keying (DP-OOK) to quadrature phase shift keying (QPSK) is proposed. The scheme is based on vector phase-sensitive amplification (PSA). Constellation and eye diagram of signals at each stage of system are obtained by simulation, and BER and EVM are calculated to show the performance of the system.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 43","pages":"1296311 - 1296311-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963455","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}
Pengyu Wang, Kun Gao, Xiaodian Zhang, Zibo Hu, Xiansong Gu, Yutong Liu
Hyperspectral images provide significant spatial and spectral information which are widely used in object detection. Two-stage detectors are commonly employed in hyperspectral object detection, where effective region proposals play a crucial role in accurate object localization. However, during non-maximum suppression (NMS) process, the Intersection over Union (IoU) metric based solely on spatial geometric information is inadequate for discriminating between similar proposals. This results in a substantial number of expected proposals with dissimilar characteristics are eliminated. In this paper, we analyze the spectral information in hyperspectral images to distinguish the characteristics of different proposals. Furthermore, this paper proposes the Spectral IoU (SIoU) by introducing spectral signature differences as a new metric. This improves the ability to differentiate between different object instances and increases the recall rate of bounding boxes with high localization confidence in region proposal stage. Moreover, SIoU can be simply integrated into the hyperspectral objection detection frameworks without introducing additional computational complexity. Extensive experiments on the Semi-Supervised Hyperspectral Object Detection Challenge dataset demonstrate the effectiveness of our method.
{"title":"Spectral intersection over union: a bounding box overlap metric for hyperspectral object detection","authors":"Pengyu Wang, Kun Gao, Xiaodian Zhang, Zibo Hu, Xiansong Gu, Yutong Liu","doi":"10.1117/12.3005336","DOIUrl":"https://doi.org/10.1117/12.3005336","url":null,"abstract":"Hyperspectral images provide significant spatial and spectral information which are widely used in object detection. Two-stage detectors are commonly employed in hyperspectral object detection, where effective region proposals play a crucial role in accurate object localization. However, during non-maximum suppression (NMS) process, the Intersection over Union (IoU) metric based solely on spatial geometric information is inadequate for discriminating between similar proposals. This results in a substantial number of expected proposals with dissimilar characteristics are eliminated. In this paper, we analyze the spectral information in hyperspectral images to distinguish the characteristics of different proposals. Furthermore, this paper proposes the Spectral IoU (SIoU) by introducing spectral signature differences as a new metric. This improves the ability to differentiate between different object instances and increases the recall rate of bounding boxes with high localization confidence in region proposal stage. Moreover, SIoU can be simply integrated into the hyperspectral objection detection frameworks without introducing additional computational complexity. Extensive experiments on the Semi-Supervised Hyperspectral Object Detection Challenge dataset demonstrate the effectiveness of our method.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 26","pages":"1296206 - 1296206-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963571","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}
Zonghuan Liu, Anna Zhao, Yunhao Zhang, Chuo Li, Tianhe Wang, Jing Xu
Mugwort floss, valued in traditional Chinese medicine, varies in therapeutic properties and market price based on origin and production year. Traditional identification methods, due to their destructiveness and low accuracy, often confuse mugwort floss with A.stolonifera and cause a testing waste. Hyperspectral Imaging, a non-contact technique, offers potential for rapid identification of such medicinal materials. In this paper, we explore hyperspectral data to differentiate mugwort and A.stolonifera using deep learning and neural networks. Using a massive hyperspectral dataset from mugwort and wormwood from two regions across four years, we analyzed performance using metrics like Accuracy, Specificity, and F1 Score. The self-attention-based Backpropagation Neural Network model showed the most promising results for accurate classification. This approach has potential future applications in various fields using Hyperspectral data
艾绒是传统中药中的珍品，其疗效和市场价格因产地和生产年份而异。传统的鉴别方法由于破坏性大、准确性低，经常会将艾绒与匍匐茎混淆，造成检测浪费。高光谱成像作为一种非接触式技术，为快速鉴定此类药材提供了可能。在本文中，我们利用深度学习和神经网络探索高光谱数据，以区分艾草和匍匐茎。我们使用来自两个地区、历时四年的艾草和匍匐茎的海量高光谱数据集，使用准确性、特异性和 F1 分数等指标分析了性能。基于自我注意的反向传播神经网络模型在准确分类方面显示出最有前途的结果。这种方法未来有可能应用于使用高光谱数据的各个领域。
{"title":"Study on identification method for Artemisia argyi floss","authors":"Zonghuan Liu, Anna Zhao, Yunhao Zhang, Chuo Li, Tianhe Wang, Jing Xu","doi":"10.1117/12.3007562","DOIUrl":"https://doi.org/10.1117/12.3007562","url":null,"abstract":"Mugwort floss, valued in traditional Chinese medicine, varies in therapeutic properties and market price based on origin and production year. Traditional identification methods, due to their destructiveness and low accuracy, often confuse mugwort floss with A.stolonifera and cause a testing waste. Hyperspectral Imaging, a non-contact technique, offers potential for rapid identification of such medicinal materials. In this paper, we explore hyperspectral data to differentiate mugwort and A.stolonifera using deep learning and neural networks. Using a massive hyperspectral dataset from mugwort and wormwood from two regions across four years, we analyzed performance using metrics like Accuracy, Specificity, and F1 Score. The self-attention-based Backpropagation Neural Network model showed the most promising results for accurate classification. This approach has potential future applications in various fields using Hyperspectral data","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 22","pages":"1296209 - 1296209-8"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963619","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}
We report a maskless reactive ion etching (RIE) method that employs O2, CHF3 and SF6&O2 gas plasma sequentially to generate nano-cones structures on silicon substrates with good uniformity. In this method, nano-cones are made under carefully-controlled conditions that restrict their width and height to 60 nm and 82 nm, respectively. According to the formation trend of nano-cones under different plasma conditions, the contributing mechanism is discussed. With the multiple effects of etching time, chamber pressure and self-bias voltage, the height, angle and density of nano-cones will be varied within a certain range. Given these variations, a nano-cone structure with good uniformity was generated using the following parameters: etching time of 300 s, chamber pressure of 40 mtorr, self-bias voltage of 75 W, and a SF6&O2 flow ratio of 75 sccm: 75 sccm. The experiment in this report demonstrates a promising way to fabricate silicon-based nano-cone structures for photonic and optoelectronic applications, with advantages of the controllability and compatibility of its dry-etching process.
{"title":"Formation of nano-cone structures on silicon via maskless reactive ion etching","authors":"Jiacheng Lin, Hao Liu, Chen Jiang, Qi Wang, Kai Liu, Xiaomin Ren","doi":"10.1117/12.3008000","DOIUrl":"https://doi.org/10.1117/12.3008000","url":null,"abstract":"We report a maskless reactive ion etching (RIE) method that employs O2, CHF3 and SF6&O2 gas plasma sequentially to generate nano-cones structures on silicon substrates with good uniformity. In this method, nano-cones are made under carefully-controlled conditions that restrict their width and height to 60 nm and 82 nm, respectively. According to the formation trend of nano-cones under different plasma conditions, the contributing mechanism is discussed. With the multiple effects of etching time, chamber pressure and self-bias voltage, the height, angle and density of nano-cones will be varied within a certain range. Given these variations, a nano-cone structure with good uniformity was generated using the following parameters: etching time of 300 s, chamber pressure of 40 mtorr, self-bias voltage of 75 W, and a SF6&O2 flow ratio of 75 sccm: 75 sccm. The experiment in this report demonstrates a promising way to fabricate silicon-based nano-cone structures for photonic and optoelectronic applications, with advantages of the controllability and compatibility of its dry-etching process.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 32","pages":"129610C - 129610C-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963678","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}
In order to avoid an unacceptable in-band S21 flatness in the multi-channel broadband microwave photonic system design, this paper established a relationship between the S21 flatness of a muti-channel broadband link and amplitude and delay errors. According to the deduction, the effect of amplitude error on S21 flatness is much less than that of delay error. And the maximum in-band S21 difference is expressed into a function of the muti-channel delay inconsistency. According to the derivation, for ensuring the in-band S21 flatness of a multi-channel microwave photonic system is less than 3dB, the delay error must be less than 13.89ps. Experimental results and simulation results demonstrate the reliability of the derivation relationship between the in-band S21 flatness and amplitude and delay errors.
{"title":"The effect of amplitude and delay errors on the S21 of a multi-channel broadband microwave photonic link","authors":"Yuan Huang, Shanting Fang, Nan Zhao, Xinmin Zhang","doi":"10.1117/12.3006819","DOIUrl":"https://doi.org/10.1117/12.3006819","url":null,"abstract":"In order to avoid an unacceptable in-band S21 flatness in the multi-channel broadband microwave photonic system design, this paper established a relationship between the S21 flatness of a muti-channel broadband link and amplitude and delay errors. According to the deduction, the effect of amplitude error on S21 flatness is much less than that of delay error. And the maximum in-band S21 difference is expressed into a function of the muti-channel delay inconsistency. According to the derivation, for ensuring the in-band S21 flatness of a multi-channel microwave photonic system is less than 3dB, the delay error must be less than 13.89ps. Experimental results and simulation results demonstrate the reliability of the derivation relationship between the in-band S21 flatness and amplitude and delay errors.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 43","pages":"129661D - 129661D-4"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138964468","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}
Jiaqing Zhao, Xiang Ding, Zhongchao Xu, Zeya Li, Lei Zhang, Yonghong Xue, Shiwei Fan, Rongke Liu
It is of strong practical significance to the management of civil aviation aircrafts through optical detection of aerial targets. A proper detection spectrum can help to enhance the target and suppress the background, guaranteeing the real-time accurate positioning and tracking of aerial targets over a wide range. Firstly, the principle of space-based air target detection is introduced. By analyzing the sources of the target radiation and background radiation, the contrast between target and background radiation intensity is determined as the evaluation standard for space-based detection. In simulations, three typical backgrounds (sea, farm and desert) and Boeing 737 aircraft were taken as examples. The apparent spectral radiance of the background in each spectral band was analyzed with the bulk and apparent spectral radiance of the aerial target under different detection conditions (detection azimuth angle, elevation angle, flight height). By traversing the 2~6 μm spectral range with a maximum spectral width of 1 μm, the contrast between target and background radiation intensity was calculated. 29 alternative spectral bands under 30 working conditions, including different flight altitudes, different backgrounds and different detection azimuth angels, were screened for the contrast between target and background radiation intensity exceeding the threshold of 2000. Considering changes in the upper and lower limit values of the contrast between the target and the background radiation intensity under each spectrum, background, target flight altitude and detection azimuth angle, the 2.53~2.54 μm spectrum could be used as one of the preferred spectral bands of the space-based aerial target optical detection system.
{"title":"Optical spectrum selection for aerial target detection under complex backgrounds","authors":"Jiaqing Zhao, Xiang Ding, Zhongchao Xu, Zeya Li, Lei Zhang, Yonghong Xue, Shiwei Fan, Rongke Liu","doi":"10.1117/12.3002174","DOIUrl":"https://doi.org/10.1117/12.3002174","url":null,"abstract":"It is of strong practical significance to the management of civil aviation aircrafts through optical detection of aerial targets. A proper detection spectrum can help to enhance the target and suppress the background, guaranteeing the real-time accurate positioning and tracking of aerial targets over a wide range. Firstly, the principle of space-based air target detection is introduced. By analyzing the sources of the target radiation and background radiation, the contrast between target and background radiation intensity is determined as the evaluation standard for space-based detection. In simulations, three typical backgrounds (sea, farm and desert) and Boeing 737 aircraft were taken as examples. The apparent spectral radiance of the background in each spectral band was analyzed with the bulk and apparent spectral radiance of the aerial target under different detection conditions (detection azimuth angle, elevation angle, flight height). By traversing the 2~6 μm spectral range with a maximum spectral width of 1 μm, the contrast between target and background radiation intensity was calculated. 29 alternative spectral bands under 30 working conditions, including different flight altitudes, different backgrounds and different detection azimuth angels, were screened for the contrast between target and background radiation intensity exceeding the threshold of 2000. Considering changes in the upper and lower limit values of the contrast between the target and the background radiation intensity under each spectrum, background, target flight altitude and detection azimuth angle, the 2.53~2.54 μm spectrum could be used as one of the preferred spectral bands of the space-based aerial target optical detection system.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 4","pages":"1296405 - 1296405-11"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994629","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}
Currently, infrared time-sensitive target detection technology is widely used in military and civil applications such as air defense and early warning, maritime surveillance, and precision guidance, but some high-value target images are difficult and expensive to acquire. To address the problems such as the lack of infrared time-sensitive target image data and the lack of multi-scene multi-target data for training, this paper proposes an infrared time-sensitive target data enhancement algorithm based on a generative model, which is a two-stage model. Firstly, in the first stage, the visible images containing time-sensitive targets are converted to infrared images by a modal conversion model based on CUT networks. Then in the second stage a large number of random targets are generated from the converted IR images using an adversarial random sample generation model to achieve the data enhancement effect. The coordinate attention mechanism is also introduced into the generator module in the second stage, which effectively enhances the feature extraction capability of the network. Finally, modal conversion experiments and sample random generation experiments are conducted, and the results show the feasibility of the data enhancement method of generative model proposed in this paper in IR time-sensitive target data enhancement, which provides a strong data support for improving IR time-sensitive target detection algorithm.
{"title":"Infrared time-sensitive target data augmentation algorithm based on generative model","authors":"Siyu Wang, Xiaogang Yang, Ruitao Lu, Qing-ge Li, Jiwei Fan, Zheng-jie Zhu","doi":"10.1117/12.3000067","DOIUrl":"https://doi.org/10.1117/12.3000067","url":null,"abstract":"Currently, infrared time-sensitive target detection technology is widely used in military and civil applications such as air defense and early warning, maritime surveillance, and precision guidance, but some high-value target images are difficult and expensive to acquire. To address the problems such as the lack of infrared time-sensitive target image data and the lack of multi-scene multi-target data for training, this paper proposes an infrared time-sensitive target data enhancement algorithm based on a generative model, which is a two-stage model. Firstly, in the first stage, the visible images containing time-sensitive targets are converted to infrared images by a modal conversion model based on CUT networks. Then in the second stage a large number of random targets are generated from the converted IR images using an adversarial random sample generation model to achieve the data enhancement effect. The coordinate attention mechanism is also introduced into the generator module in the second stage, which effectively enhances the feature extraction capability of the network. Finally, modal conversion experiments and sample random generation experiments are conducted, and the results show the feasibility of the data enhancement method of generative model proposed in this paper in IR time-sensitive target data enhancement, which provides a strong data support for improving IR time-sensitive target detection algorithm.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 18","pages":"1296005 - 1296005-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994945","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}
Xiaodi Ji, Hongyi Ge, Yuying Jiang, Xuyang Wu, Zhiyuan Jia, Zhenyu Sun
Multi-band terahertz metamaterial absorbers offer new perspectives to achieve perfect absorption and multipoint information matching, which enable an ever-growing number of applications. In this study, a dual-band terahertz metamaterial absorber based on the metal split ring is designed. The absorber has perfect absorption peaks at 1.15 THz and 2.47 THz, and the absorption rate is more than 99%. The absorber produces a harp peak with a bandwidth of 0.008 at 2.47 THz, which has an extremely high quality factor of 308. The distribution of the electric field and surface current at two resonance points is analyzed using the finite element integration method. Through full wave simulation calculation, the maximum sensitivity of the analyte refractive index of the absorber is 400 GHz/RIU, and the maximum sensitivity of the thickness is 35 GHz/μm. The results show that the absorber can achieve highly sensitive detection of trace substances.
{"title":"Terahertz metamaterial narrowband absorber based on metal split ring","authors":"Xiaodi Ji, Hongyi Ge, Yuying Jiang, Xuyang Wu, Zhiyuan Jia, Zhenyu Sun","doi":"10.1117/12.3008045","DOIUrl":"https://doi.org/10.1117/12.3008045","url":null,"abstract":"Multi-band terahertz metamaterial absorbers offer new perspectives to achieve perfect absorption and multipoint information matching, which enable an ever-growing number of applications. In this study, a dual-band terahertz metamaterial absorber based on the metal split ring is designed. The absorber has perfect absorption peaks at 1.15 THz and 2.47 THz, and the absorption rate is more than 99%. The absorber produces a harp peak with a bandwidth of 0.008 at 2.47 THz, which has an extremely high quality factor of 308. The distribution of the electric field and surface current at two resonance points is analyzed using the finite element integration method. Through full wave simulation calculation, the maximum sensitivity of the analyte refractive index of the absorber is 400 GHz/RIU, and the maximum sensitivity of the thickness is 35 GHz/μm. The results show that the absorber can achieve highly sensitive detection of trace substances.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 45","pages":"129631O - 129631O-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963778","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}
This paper introduces the thermal effect of the slab amplifying module in the high-energy solid-state laser, mainly simulates the influence of the thickness of the metal indium layer on the welding surface of the slab and the heat sink on the thermal effect of the slab, and analyzes the effect of different thicknesses of the indium layer on the thermal effect of the slab. The thickness of the metal indium layer used in the calculation is 10μm, 40μm and 80μm respectively. This paper provides a powerful reference for the engineering application of high-power and high-beam-quality all-solid-state laser systems.
{"title":"Simulation of thermal stress on soldering surface of conduction cooling end-pumped slat laser amplifier","authors":"Lu Chen, S. Bian, Lei Liu, Wentao Wang","doi":"10.1117/12.3011141","DOIUrl":"https://doi.org/10.1117/12.3011141","url":null,"abstract":"This paper introduces the thermal effect of the slab amplifying module in the high-energy solid-state laser, mainly simulates the influence of the thickness of the metal indium layer on the welding surface of the slab and the heat sink on the thermal effect of the slab, and analyzes the effect of different thicknesses of the indium layer on the thermal effect of the slab. The thickness of the metal indium layer used in the calculation is 10μm, 40μm and 80μm respectively. This paper provides a powerful reference for the engineering application of high-power and high-beam-quality all-solid-state laser systems.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 19","pages":"129591G - 129591G-3"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963785","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}
Dexian Pan, Kesheng Guo, Liping Liu, Senjie Zheng, Bin He, Lang Hu, Qiang Hu
Diamond films have excellent transmittance from ultraviolet to far infrared, as well as excellent resistance to laser damage, mechanics, dust, rain, and other characteristics. Therefore, diamond films are used in aircraft infrared windows and supersonic flight missile hoods. The surface of supersonic aircraft can cause plasma ablation under intense aerodynamic heating. High temperature gas on the surface has strong vibration, dissociation, and ionization, resulting in many defects in the optical windows and protective covers on the outer surface of the aircraft, which may lead to deterioration of optical performance. In this thesis, microwave plasma chemical vapor deposition (MPCVD) method was used to synthesize high-quality diamond films using high-purity gas, while using magnetron sputtering to deposit multicomponent alloy coating as a protective layer to study the high-frequency plasma ablation effect of diamond films. Raman spectroscopy, visible-infrared transmittance spectra and field emission scanning electron microscopy was used to analyze the spectrum of diamond films before and after high-frequency plasma ablation. It was found that the multicomponent alloy coatings have good ablation resistance and high transmittance in the 1~4μm wavelength range, while the carbon and alloying components remain on the film surface. This research contributes to promoting the supersonic flight application of diamond films and provides data reference for the design of aircraft outer surface materials.
{"title":"Effect of multicomponent alloy coating on high frequency plasma ablation of diamond films","authors":"Dexian Pan, Kesheng Guo, Liping Liu, Senjie Zheng, Bin He, Lang Hu, Qiang Hu","doi":"10.1117/12.3005965","DOIUrl":"https://doi.org/10.1117/12.3005965","url":null,"abstract":"Diamond films have excellent transmittance from ultraviolet to far infrared, as well as excellent resistance to laser damage, mechanics, dust, rain, and other characteristics. Therefore, diamond films are used in aircraft infrared windows and supersonic flight missile hoods. The surface of supersonic aircraft can cause plasma ablation under intense aerodynamic heating. High temperature gas on the surface has strong vibration, dissociation, and ionization, resulting in many defects in the optical windows and protective covers on the outer surface of the aircraft, which may lead to deterioration of optical performance. In this thesis, microwave plasma chemical vapor deposition (MPCVD) method was used to synthesize high-quality diamond films using high-purity gas, while using magnetron sputtering to deposit multicomponent alloy coating as a protective layer to study the high-frequency plasma ablation effect of diamond films. Raman spectroscopy, visible-infrared transmittance spectra and field emission scanning electron microscopy was used to analyze the spectrum of diamond films before and after high-frequency plasma ablation. It was found that the multicomponent alloy coatings have good ablation resistance and high transmittance in the 1~4μm wavelength range, while the carbon and alloying components remain on the film surface. This research contributes to promoting the supersonic flight application of diamond films and provides data reference for the design of aircraft outer surface materials.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":" 27","pages":"129620K - 129620K-8"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138964349","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：