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Investigation of spline approximation approach of surface data for synthesis of high-efficient beam shapers 用于合成高效光束整形器的表面数据样条近似法研究
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687119
Yan V. Terlo, Aleksandra Bobe, Alexander E. Ivanov, Anna O. Voznesenskaya
{"title":"Investigation of spline approximation approach of surface data for synthesis of high-efficient beam shapers","authors":"Yan V. Terlo, Aleksandra Bobe, Alexander E. Ivanov, Anna O. Voznesenskaya","doi":"10.1117/12.2687119","DOIUrl":"https://doi.org/10.1117/12.2687119","url":null,"abstract":"When specifying optical surfaces of complex shape, polynomial representation methods are often used. However, if the equation of the curve is not described by a standard polynomial, the approximation error at the edges of such functions increases sharply - this introduces huge oscillations. Freeform surfaces of a complex geometric representation are achieved often as a result of design of beam shapers. Spline methods allow minimizing the effect of oscillations after the surface approximation of the beam shapers. In this paper, a comparative analysis of methods for approximation of freeform surfaces is given using the example of Focal-piShaper synthesis and single collimating lens with one freeform surface. The approximation results for the Focal-piShaper prove the high efficiency of the spline approximation, while in the case of aberration-free collimating lens it is preferable to use polynomial regression.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"1 1","pages":"127650L - 127650L-8"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139221733","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}
引用次数: 0
Fabrication of the SNAP microresonator devices by high-ohmic wire heating 通过高微米线加热制造 SNAP 微谐振器设备
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686256
Dmitry V. Kudashkin, Michael Sumetsky, Ilya D. Vatnik
{"title":"Fabrication of the SNAP microresonator devices by high-ohmic wire heating","authors":"Dmitry V. Kudashkin, Michael Sumetsky, Ilya D. Vatnik","doi":"10.1117/12.2686256","DOIUrl":"https://doi.org/10.1117/12.2686256","url":null,"abstract":"In this work we present a novel technique to fabricate whispering gallery modes microresonators on the regular optical fiber surface. We use a high-resistance wire heated by constant electrical current up to temperatures of 1100 °C. Due to higher temperature stability, high reproducibility of the microcavities shaping is ensured. Our method makes it possible to reduce the cost and simplify the production of WGM microresonators on the optical fiber surface.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"38 3","pages":"127730M - 127730M-3"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139222814","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}
引用次数: 0
Application of PT-symmetry in metasurfaces for measuring the inclination angle 将 PT 对称性应用于元曲面的倾角测量
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686512
Ekaterina A. Efremova, Igor R. Krylov, Uliana V. Prokhorova, E. Shalymov, V. Shoev, Vladimir Y. Venediktov, A. A. Zinchik
{"title":"Application of PT-symmetry in metasurfaces for measuring the inclination angle","authors":"Ekaterina A. Efremova, Igor R. Krylov, Uliana V. Prokhorova, E. Shalymov, V. Shoev, Vladimir Y. Venediktov, A. A. Zinchik","doi":"10.1117/12.2686512","DOIUrl":"https://doi.org/10.1117/12.2686512","url":null,"abstract":"The purpose of this study is to develop an optical inclination angle sensor using a metasurface as a scale. We propose to use the dependence of the reflection or transmission spectrum of the metasurface on the direction of light incident on it to measure the inclination angle. The disadvantages of this approach when using the simplest completely passive metasurfaces are considered. In particular, the use of bulky devices to scan the spectrum of the structure. As an alternative, the possibility of using metasurfaces with parity-time-symmetry properties to measure the inclination angle is proposed and investigated. Then no spectrum scanning of the metasurface is required to perform inclination angle measurements. As an example, a metastructure formed by two optically coupled subwavelength diffraction gratings (one of which is characterized by losses, and the other by gain) with a rectangular stroke profile is considered. The study is based on computer modeling by the finite element method.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"26 1","pages":"1277306 - 1277306-8"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139223916","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}
引用次数: 0
A wavelength tunable and integrated ultra-narrow linewidth DBR semiconductor lasers 波长可调的集成式超窄线宽 DBR 半导体激光器
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2688968
Yilu Wu, Xin Zhang, Qingsong Bai, Yuqi Hu, Wei Xiong, Guangqiong Xia, Dan Lu, Zhengmao Wu, Jiagui Wu
{"title":"A wavelength tunable and integrated ultra-narrow linewidth DBR semiconductor lasers","authors":"Yilu Wu, Xin Zhang, Qingsong Bai, Yuqi Hu, Wei Xiong, Guangqiong Xia, Dan Lu, Zhengmao Wu, Jiagui Wu","doi":"10.1117/12.2688968","DOIUrl":"https://doi.org/10.1117/12.2688968","url":null,"abstract":"We proposed an integrated semiconductor laser scheme that combines an ultra-high Q silicon nitride microresonator with a DBR semiconductor laser, resulting in a tunable ultra-narrow linewidth laser. The experiment achieves tuning within the wavelength range of 1554.2-1557.15nm (about 370GHz), being almost ten times larger than that of reported DFB scheme. Moreover, the sidemode suppression ratio is low to 52dB with a ultra-narrow linewidth about 6.6kHz. It needs the joint adjustment of DBR operating current, coupling of the high-Q silicon nitride external cavity. These results can be applied in fields such as dense wavelength division multiplexing systems and integration LiDAR System.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"9 2 1","pages":"1276404 - 1276404-4"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139227715","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}
引用次数: 0
Nonvolatile electrically reconfigurable silicon photonics enabled by back-end-of-line integration of phase change materials 通过后端集成相变材料实现非易失性电气可重构硅光子学
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687022
Junying Li, Maoliang Wei, Kai Xu, Bo Tang, Yiting Yun, Peng Zhang, Yingchun Wu, Kangjian Bao, Kunhao Lei, Zequn Chen, Hui Ma, Chunlei Sun, Ruonan Liu, Ming Li, Lan Li, Hongtao Lin
{"title":"Nonvolatile electrically reconfigurable silicon photonics enabled by back-end-of-line integration of phase change materials","authors":"Junying Li, Maoliang Wei, Kai Xu, Bo Tang, Yiting Yun, Peng Zhang, Yingchun Wu, Kangjian Bao, Kunhao Lei, Zequn Chen, Hui Ma, Chunlei Sun, Ruonan Liu, Ming Li, Lan Li, Hongtao Lin","doi":"10.1117/12.2687022","DOIUrl":"https://doi.org/10.1117/12.2687022","url":null,"abstract":"Nonvolatile light-field manipulation via electrically-driven phase transition of chalcogenide phase change materials (PCMs) is regarded as one of the most powerful solutions to low-power-consumption and compact integrated reconfigurable photonics. However, before the breakthrough in large-scale integration approaches linked to wafer foundries, phase-change non-volatile reconfigurable photonics could hardly see their widespread practical applications. Here we demonstrate nonvolatile photonic devices fabricated by back-end-of-line (BOEL) integration of PCMs into the commercial silicon photonics platform. A narrow trench etched into the BOEL dielectric layer exposed the waveguide core and allowed for the direct deposition of various PCM films on the waveguide in the functional areas. Fine-tuning the nonvolatile phase transition of Sb2Se3 via a PIN microheater was verified by realizing the post-fabrication trimming of silicon photonic devices. Our work highlights a reliable platform for large-scale PCM-integrated photonics and validates its precise nonvolatile reconfigurability.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"25 3","pages":"127640D - 127640D-5"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139215392","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}
引用次数: 0
Large aperture flat-top beam shaping and long-distance transmission based on off-axis reflective freeform surface optical system 基于离轴反射自由曲面光学系统的大孔径平顶光束整形和长距离传输
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2689075
Chengxiang Guo, Lei Yang, Tong Yang, Zewu Liu, Hongbo Xie
{"title":"Large aperture flat-top beam shaping and long-distance transmission based on off-axis reflective freeform surface optical system","authors":"Chengxiang Guo, Lei Yang, Tong Yang, Zewu Liu, Hongbo Xie","doi":"10.1117/12.2689075","DOIUrl":"https://doi.org/10.1117/12.2689075","url":null,"abstract":"Flat-top beam is widely used in laser applications such as holography, material processing, and nuclear fusion. However, it is difficult to maintain the flat-top effect over long distances due to the limitations of wavefront modulation and natural diffraction effects. This study aims to shape a circular Gaussian beam into a canonical flat-top beam and preserve its flat-top characteristics during long-distance (meter-level) transmission. Based on the principle of energy conservation, an energy mapping relationship between the incident plane and the output plane is constructed, and a circular flat-top intensity distribution is obtained at the output plane. The wavefront quality of the outgoing beam is controlled by the principle of equivalent optical length between mapping point elements. An off-axis reflective free-form surface optical shaping system is designed. The incident Gaussian beam has a spectral range of 1060±15nm, a beam waist diameter of 40mm, an energy truncation diameter of 60mm, and a beam quality β of 3. After the shaping system, a flat-top beam is shaped at the position of 5m output plane behind the mirror. The energy uniformity is more than 95% and the energy utilization rate is more than 90% within the diameter of 60mm. The flat-top effect can be maintained within 10m. The results show that this system can effectively shape and transmit a flat-top beam over long distances. This study provides a novel and practical method for flat-top beam shaping and transmission, which has potential applications in various laser fields.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"21 1","pages":"127650K - 127650K-9"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139216429","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}
引用次数: 0
A compact and simple silicon nanowire based-polarization converter with ultra-high conversion efficient and broad bandwidth 具有超高转换效率和宽带宽的基于硅纳米线的简洁紧凑型偏振转换器
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687956
Chen Chen
{"title":"A compact and simple silicon nanowire based-polarization converter with ultra-high conversion efficient and broad bandwidth","authors":"Chen Chen","doi":"10.1117/12.2687956","DOIUrl":"https://doi.org/10.1117/12.2687956","url":null,"abstract":"Although the polarization converter utilizing silicon photonics technology has been reported several years ago, either the performance (conversion efficiency and operation window) or the manufacture is always limited by the cross-polarization coupling theory. We discovered that an asymmetric nanowire waveguide changing along the wave propagation direction produced a gradient effective mode index. A TE-to-TM polarization converter consisted of an asymmetric nanowire waveguide and a uniform nanowire waveguide constructed on the SOI platform was demonstrated. Gradient effective mode index effect and mode coupling theory promoted an ultra-high polarization conversion efficiency of 99.997% and broad wavelength operation window of 100 nm. Compact configuration presents high integration density, which benefits the on-chip mode multiplexing technology. Simple structure with moderate critical dimension facilitates the fabrication fast and cheap.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"18 1","pages":"127640A - 127640A-9"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139217333","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}
引用次数: 0
Impact of laser polarization and angle of incidence on phase shifting efficacy of an all-optically addressed liquid crystal delay line at X band 激光偏振和入射角对 X 波段全光地址液晶延迟线移相功效的影响
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2685859
Jinfeng Li
{"title":"Impact of laser polarization and angle of incidence on phase shifting efficacy of an all-optically addressed liquid crystal delay line at X band","authors":"Jinfeng Li","doi":"10.1117/12.2685859","DOIUrl":"https://doi.org/10.1117/12.2685859","url":null,"abstract":"This article conducts an experimental investigation into the impact of laser polarization and angle of incidence on the efficiency of a liquid crystal enabled 0-180° phase shifting delay line operating at the X band. According to measurement results, the polarization of the laser beam with regard to the rubbing direction and the liquid crystal filling direction has a significant impact on the tuning efficacy of the delay line. The possible phase shift is increased when the laser beam is polarized parallel to both the liquid crystal filling direction and the rubbing direction. Furthermore, the effectiveness of the delay line's phase shifting is non-linearly influenced by the angle of incidence, as evidenced by another two experiments that were carried out with the laser source rotated at the same and diverse planes relative to the fixed rubbing alignment direction, respectively.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"40 1","pages":"127640X - 127640X-4"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139217346","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}
引用次数: 0
Changes of the SNAP resonator shape owing to mode energy dissipation 模式能量耗散导致 SNAP 谐振器形状发生变化
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686322
Arcadiy Novikov, Dmitry V. Kudashkin, Ilya D. Vatnik
{"title":"Changes of the SNAP resonator shape owing to mode energy dissipation","authors":"Arcadiy Novikov, Dmitry V. Kudashkin, Ilya D. Vatnik","doi":"10.1117/12.2686322","DOIUrl":"https://doi.org/10.1117/12.2686322","url":null,"abstract":"The whispering gallery mode (WGM) optical microresonators formed on the optical fiber surface appear as a promising ultraprecise and ultralow loss technological platform (known as Surface Nanoscale Axial Photonics, SNAP) to create miniature optical devices including delay lines, signal processors, photonic sensors, optical frequency comb generators, etc. It is important to note that applications involving high intracavity power may face intense cavity heating and hence unwanted radius changes. Here we the heating effects in SNAP cavities both experimentally and numerically and reveal the changes in the mode structure induced by the heating due to whispering gallery mode energy dissipation.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"23 1","pages":"127730N - 127730N-3"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139220156","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}
引用次数: 0
Development of a fast aperture, high resolution, wide-angle, optically passive athermalized LWIR lens for driver vision enhancer systems 开发用于驾驶员视觉增强系统的快孔径、高分辨率、广角、光学无源热化型近红外透镜
SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2688439
Vu Thanh Dat, X. Dang, Van Dat Nguyen
{"title":"Development of a fast aperture, high resolution, wide-angle, optically passive athermalized LWIR lens for driver vision enhancer systems","authors":"Vu Thanh Dat, X. Dang, Van Dat Nguyen","doi":"10.1117/12.2688439","DOIUrl":"https://doi.org/10.1117/12.2688439","url":null,"abstract":"This paper presents the design of a fast aperture, high resolution, wide-angle, optically passive athermalized long-wave infrared (LWIR) lens suitable for driver vision enhancer systems. The growing demand in high resolution thermal imaging has led to the need for advanced lens designs that can deliver exceptional performance in this electromagnetic spectrum. The proposed lens design focuses on achieving a fast aperture, which is crucial for capturing object details in modern bolometer arrays with smaller pixel pitch. Additionally, the design provides a wide-angle field of view to enable comprehensive scene coverage. The use of optical passive athermalization technique also ensures that the lens maintain its performance across a wide range of operating temperatures, thereby eliminating the need for any active temperature compensation mechanisms. In order to achieve a large image diameter, the lens design incorporates aspheric and diffractive surfaces, as well as a combination between conventional and chalcogenide materials. These elements help to minimize optical aberrations and increase image sharpness. With the use of computer-aided design software and its corresponding optical simulation tools, the design was refined to meet the desired specifications, including resolution, field of view and athermalization requirements. The resulting lens design managed to achieve a horizontal field of view of 76 degrees with a fast aperture of F1.0 for an uncooled 12-micron SXGA detector. This design ensures consistent and nearly diffraction-limited performance in diverse operating conditions, making it suitable for driver vision enhancer systems, as well as the general automotive applications.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"61 1","pages":"127650G - 127650G-8"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139220291","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}
引用次数: 0
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