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Study of a Distributed Feedback Diode Laser Based Hygrometer Combined Herriot-Gas Cell and Waterless Optical Components 被引量:4
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作者 Yubin WEI Jun CHANG +2 位作者 Jie LIAN Qiang WANG Wei WEI 《Photonic Sensors》 SCIE EI CAS CSCD 2016年第3期214-220,共7页
A distributed feedback diode laser (DFB-DL) based hygrometer combined with a long-path-length Herriot gas cell and waterless optical components was proposed and investigated. The main function of this sensor was to ... A distributed feedback diode laser (DFB-DL) based hygrometer combined with a long-path-length Herriot gas cell and waterless optical components was proposed and investigated. The main function of this sensor was to simultaneously improve the measurement reliability and resolution. A comparison test between a 10-cm normal transmission-type gas cell and a 3-m Herriot gas cell was carried out to demonstrate the improvement. Reliability improvement was achieved by influence suppression of water vapor inside optical components (WVOC) through combined action of the Herriot gas cell and waterless optical components. The influence of WVOC was suppressed from 726ppmv to 25ppmv using the Herriot gas cell. Moreover, combined with waterless optical components, the influence of WVOC was further suppressed to no more than 4ppmv. Resolution improvement from l l.7ppmv to 0.32ppmv was achieved mainly due to the application of the long-path-length Herriot gas cell. The results show that the proposed sensor has a good performance and considerable potential application in gas sensing, especially when probed gas possibly permeates into optical components. 展开更多
关键词 Herriot gas cell HYGROMETER wavelength modulation spectroscopy waterless optical components water vapor inside optical components
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Recent Progress on Fiber-Based Optical Components
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作者 Akira Wada 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期233-234,共2页
The trends of fiber-based optical component technologies are reviewed focusing on fused-taper couplers and fiber Bragg gratings for high bit-rate DWDM transmission systems.
关键词 been in AS with of FBG Recent Progress on Fiber-Based optical components HAVE on
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Optical Instruments and Components
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《光机电信息》 2006年第6期80-82,共3页
关键词 YAG Co LENGTH optical Instruments and components www PCV nm PV SBP
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Optical Instruments and Components
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《光机电信息》 2005年第12期44-47,共4页
关键词 LENGTH Co YAG STAR optical Instruments and components www nm high FWHM http SBP
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Optical Instruments and Components
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《光机电信息》 2005年第4期55-57,共3页
Beijing Optical Instrument Plant;Penglai Yuandong Optical Elements Co., Ltd.;Beijing Zolix Optical Instrunments Co.,Ltd,;Beijing Huawei Haorun Device Co., Ltd.;
关键词 MTS LENGTH optical Instruments and components
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The mechanism study of low-pressure air plasma cleaning on large-aperture optical surface unraveled by experiment and reactive molecular dynamics simulation
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作者 Yuhai LI Qingshun BAI +9 位作者 Yuheng GUAN Hao LIU Peng ZHANG Buerlike BATELIBIEKE Rongqi SHEN Lihua LU Xiaodong YUAN Xinxiang MIAO Wei HAN Caizhen YAO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第6期77-87,共11页
Low-pressure air plasma cleaning is an effective method for removing organic contaminants on large-aperture optical components in situ in the inertial confinement fusion facility.Chemical reactions play a significant ... Low-pressure air plasma cleaning is an effective method for removing organic contaminants on large-aperture optical components in situ in the inertial confinement fusion facility.Chemical reactions play a significant role in plasma cleaning,which is a complex process involving abundant bond cleavage and species generation.In this work,experiments and reactive molecular dynamics simulations were carried out to unravel the reaction mechanism between the benchmark organic contaminants of dibutyl phthalate and air plasma.The optical emission spectroscopy was used to study the overall evolution behaviors of excited molecular species and radical signals from air plasma as a reference to simulations.Detailed reaction pathways were revealed and characterized,and specific intermediate radicals and products were analyzed during experiments and simulation.The reactive species in the air plasma,such as O,HO_(2)and O_(3)radicals,played a crucial role in cleaving organic molecular structures.Together,our findings provide an atomic-level understanding of complex reaction processes of low-pressure air plasma cleaning mechanisms and are essential for its application in industrial plasma cleaning. 展开更多
关键词 organic contaminants large-aperture optical components low-pressure air plasma plasma cleaning reactive species reactive molecular dynamics
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Spatial Mode-Division Multiplexing for High-Speed Optical Coherent Detection Systems 被引量:1
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作者 William Shieh Abdullah Al Amin 《ZTE Communications》 2012年第1期18-22,共5页
Spatial modedivision multiplexing is emerging as a potential solution to further increasing optical fiber capacity and spectral efficiency. We report a dualmode, dualpolarization transmission method based on modeselec... Spatial modedivision multiplexing is emerging as a potential solution to further increasing optical fiber capacity and spectral efficiency. We report a dualmode, dualpolarization transmission method based on modeselective excitation and detection over a twomode fiber. In particular, we present 107 Gbit/s coherent optical OFDM (COOFDM) transmission over a 4.5 km twomode fiber using LP and LP. modes in which mode separation is performed optically. 展开更多
关键词 coherent communications few-mode fiber mode converter fiber optic components
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Human eye ocular component analysis for refractive state and refractive surgery 被引量:3
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作者 Chao-Kai Chang Jui-Teng Lin Yong Zhang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2017年第7期1076-1080,共5页
AIM: To analyze the clinical factors influencing the human vision corrections via the changing of ocular components of human eye in various applications; and to analyze refractive state via a new effective axial leng... AIM: To analyze the clinical factors influencing the human vision corrections via the changing of ocular components of human eye in various applications; and to analyze refractive state via a new effective axial length.METHODS: An effective eye model was introduced by the ocular components of human eye including refractive indexes, surface radius(r1, r2, R1, R2) and thickness(t, T) of the cornea and lens, the anterior chamber depth(S1) and the vitreous length(S2). Gaussian optics was used to calculate the change rate of refractive error per unit amount of ocular components of a human eye(the rate function M). A new criterion of myopia was presented via an effective axial length.RESULTS: For typical corneal and lens power of 42 and 21.9 diopters, the rate function Mj(j=1 to 6) were calculated for a 1% change of r1, r2, R1, R2, t, T(in diopters) M1=+0.485, M2=-0.063, M3=+0.053, M4=+0.091, M5=+0.012, and M6=-0.021 diopters. For 1.0 mm increase of S1 and S2, the rate functions were M7=+1.35, and M8=-2.67 diopter/mm, respectively. These rate functions were used to analyze the clinical outcomes in various applications including laser in situ keratomileusis surgery, corneal cross linking procedure, femtosecond laser surgery and scleral ablation for accommodation.CONCLUSION: Using Gaussian optics, analytic formulas are presented for the change of refractive power due to various ocular parameter changes. These formulas provide useful clinical guidance in refractive surgery and other related procedures. 展开更多
关键词 Gaussian optics human eye ocular components refractive errors vision correction laser in situ keratomileusis corneal collagen crosslinking
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Multi-TBaud Optical Coding Based on Superluminal Space-to-Time Mapping in Long Period Gratings 被引量:1
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作者 Reza Ashrafi Ming Li José Azana 《Optics and Photonics Journal》 2013年第2期126-130,共5页
A novel time-domain ultra-fast pulse shaping approach for multi-TBaud serial optical communication signal (e.g. QPSK and 16-QAM) generation based on the first-order Born approximation in feasible all-fiber long-period... A novel time-domain ultra-fast pulse shaping approach for multi-TBaud serial optical communication signal (e.g. QPSK and 16-QAM) generation based on the first-order Born approximation in feasible all-fiber long-period gratings is proposed and numerically demonstrated. 展开更多
关键词 Pulse Shaping Fiber Optics components All-optical Devices Ultra-fast Processing
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Specification and Measurement of Mid-Frequency Wavefront Errors
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作者 XUAN Bin XIE Jing-jiang 《光机电信息》 2006年第12期35-39,共5页
Mid-frequency wavefront errors can be of the most importance for some optical components, but they're not explicitly covered by corresponding international standards such as ISO 10110. The testing methods for the ... Mid-frequency wavefront errors can be of the most importance for some optical components, but they're not explicitly covered by corresponding international standards such as ISO 10110. The testing methods for the errors also have a lot of aspects to be improved. This paper gives an overview of the specifications especially of PSD. NIF, developed by America, and XMM, developed by Europe, have both discovered some new testing methods. 展开更多
关键词 mid-frequency errors optical component specification TESTING MEASUREMENT
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Study on Injection Moulding of High Precision Aspheric Plastic Lens 被引量:1
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作者 TO Suet LEE Wing-bun 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期132-,共1页
With the rapid development of information and multi me dia technologies, the demand for the optical plastic aspheric elements used in o pto-electronic devices, camera, optical disc and projector lens etc. has been i n... With the rapid development of information and multi me dia technologies, the demand for the optical plastic aspheric elements used in o pto-electronic devices, camera, optical disc and projector lens etc. has been i ncreased rapidly in the recent years. The key technologies of fabrication of asp heric plastic lens are the design and manufacturing moulds, selection of proper injection moulding equipment, and optimization of injection moulding parameters etc. In this paper, the effect of injection pressure, moulding temperature, cool ing time and injection speed on the surface profile of the lenses during injecti on and holding process is investigated. Surface quality of plastic lenses is mea sured by Talysurf Texture Measuring System. The experimental results showed that the injection pressure and moulding temperature are important parameters compar ing to cooling time and injection speed. A bit change of injection pressure or m oulding temperature will affect the property of the surface profile. Either incr easing injection pressure or mould temperature can achieve less shrinkage. Other wise, a lower injection pressure will produce more shrinkage, more air traps and a lower mould temperature results greater warp and higher shrinkage. The dynami c process of injection for optical plastic lenses is simulated by 3D Moldflow pl astic Insight software (MPI). The MPI will help us to optimize injection mouldin g parameters. 展开更多
关键词 injection moulding aspheric lens optical compon ent OPTIMIZATION
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Guided Modes of Hollow Optical Fiber Based Components: Analytical Solutions 被引量:1
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作者 P. Roy Chaudhuri C. Lu W. Xiaoyan 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期159-160,共2页
Guided modes in a hollow optical fiber are investigated using both scalar approximation and exact vectorial analysis. Effective indices of modes are seen to exhibit "nearly degenerate" groups. Besides provid... Guided modes in a hollow optical fiber are investigated using both scalar approximation and exact vectorial analysis. Effective indices of modes are seen to exhibit "nearly degenerate" groups. Besides providing an insight of modal characteristics, the analysis would prove to be useful to define design parameters for realizing components based on these fibers, and to explore new possibilities. 展开更多
关键词 MODE in on for of Guided Modes of Hollow optical Fiber Based components Analytical Solutions
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Optical DE/MUX Components for Datacomunication Applications 被引量:1
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作者 Ian H White Richard V Penty +1 位作者 Kevin A Williams Chris N Morgan 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期617-618,共2页
This paper reviews the potential for WDM systems to be implemented within datacommunication systems, and indicates future network functions. Spectral and temporal multiplexing functions are reviewed, with particular f... This paper reviews the potential for WDM systems to be implemented within datacommunication systems, and indicates future network functions. Spectral and temporal multiplexing functions are reviewed, with particular focus being placed on 2DIO and amplifier based crosspoint components. 展开更多
关键词 for be in optical DE/MUX components for Datacomunication Applications WDM
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Generation of tunable multi-wavelength optical short pulses using self-seeded Fabry-Perot laser diode and tilted multimode fiber Bragg grating 被引量:2
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作者 蔡同健 刘云启 +1 位作者 张小贝 王廷云 《Chinese Optics Letters》 SCIE EI CAS CSCD 2011年第4期48-51,共4页
We experimentally demonstrate the simultaneous generation of tunable multi-wavelength picosecond laser pulses using a self-seeding configuration that consists of a gain-switched Fabry-Perot laser diode (FPLD) with a... We experimentally demonstrate the simultaneous generation of tunable multi-wavelength picosecond laser pulses using a self-seeding configuration that consists of a gain-switched Fabry-Perot laser diode (FPLD) with an external cavity formed by a tilted multimode fiber Bragg grating. Dual- and triple-wavelength pulses are obtained and tuned in a flexible manner by changing the temperature of the FPLD. The side mode suppression ratio larger than 25 dB is achieved at different dual- and triple-wavelengths and the typical pulsewidth of the output pulses is ,-70 ps. In the experiment, the wavelength separation can be narrowed to 0.57 nm. 展开更多
关键词 FABRY Perot interferometers Fiber Bragg gratings Fiber optic components Fiber optic sensors Multimode fibers
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Mitigation of stimulated Raman scattering in a high-power fiber master oscillator power amplifier laser based on a dual-structure fiber grating
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作者 Kerong Jiao Qingqing Kong +5 位作者 Yangning Guo Jingwei Li Chen Wu Zhigang Han Rihong Zhu Hua Shen 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2023年第6期264-276,共13页
With the increasing power of fiber lasers,single chirped and tilted fiber Bragg gratings(CTFBGs)cannot completely mitigate continuously enhanced system-excited stimulated Raman scattering(SRS).Although improving the l... With the increasing power of fiber lasers,single chirped and tilted fiber Bragg gratings(CTFBGs)cannot completely mitigate continuously enhanced system-excited stimulated Raman scattering(SRS).Although improving the loss rate of a single CTFBG or cascading multiple CTFBGs can provide better suppression of the stronger SRS,excessive insertion loss may cause significant attenuation of the output power.Confronting the challenge,we firstly present an SRS mitigation method based on a dual-structure fiber grating in this paper.The dual-structure fiber grating comprises a CTFBG and a fiber Bragg grating structure,which were designed and fabricated on a passive 25/400 double-clad fiber.To evaluate the performance of the grating,a 3 kW fiber master oscillator power amplifier laser is established.The experimental results demonstrate that the SRS mitigation rate of the grating is greater than 30 dB(99.9%),whereas the insertion loss is only approximately 3%,thus allowing for minimal deterioration of the output power.This solves the contradiction between high suppression rate and high insertion loss faced by CTFBGs,which in turn makes dualstructure fiber gratings particularly suitable for mitigating SRS in 3-5 kW high-power fiber lasers. 展开更多
关键词 dual-structure fiber grating fiber optics component high-power fiber laser stimulated Raman scattering
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In-fiber integrated optics: an emerging photonics integration technology [Invited] 被引量:1
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作者 Xiaotong Zhang Tingting Yuan +5 位作者 Xinghua Yang Chunying Guan Jun Yang Zhihai Liu Hongchang Deng Libo Yuan 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第11期14-21,共8页
In-fiber integrated optics is an attempt to use silica fiber as a substrate, integrating various optical paths or optical components into a single fiber, to build a functional optical device or component, and to reali... In-fiber integrated optics is an attempt to use silica fiber as a substrate, integrating various optical paths or optical components into a single fiber, to build a functional optical device or component, and to realize a micro optical system, achieving various functions. In-fiber integrated optics is expected to he a new branch of photonics integration. This integration technique enables convenient light beams control and manipulation inside in one fiber. It also provides a research platform with micro and nano scale for interaction between light wave and microfluidic materials. In this review, we briefly summarize the main ideas and key technologies of the in-fiber integrated optics by series integration examples. 展开更多
关键词 Beam manipulation Integrated optics Light beams optical components Silica fibers
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Study on the spectral response of fiber Bragg grating sensor under non-uniform strain distribution in structural health monitoring 被引量:20
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作者 黄红梅 袁慎芳 《Optoelectronics Letters》 EI 2011年第2期109-112,共4页
Many theoretical studies have been developed to study the spectral response of a fiber Bragg grating (FBG) under non-uniform strain distribution along the length of FBG in recent years. However, almost no experiments ... Many theoretical studies have been developed to study the spectral response of a fiber Bragg grating (FBG) under non-uniform strain distribution along the length of FBG in recent years. However, almost no experiments were designed to obtain the evolution of the spectrum when a FBG is subjected to non-uniform strain. In this paper, the spectral responses of a FBG under non-uniform strain distributions are given and a numerical simulation based on the Runge-Kutta method is introduced to investigate the responses of the FBG under some typical non-uniform transverse strain fields, including both linear strain gradient and quadratic strain field. Experiment is carried out by using loads applied at different locations near the FBG. Good agreements between experimental results and numerical simulations are obtained. 展开更多
关键词 Computer simulation EXPERIMENTS Fiber Bragg gratings Fiber optic components Fiber optic sensors Numerical methods Runge Kutta methods Structural health monitoring
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A high sensitive fiber Bragg grating strain sensor with automatic temperature compensation 被引量:16
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作者 李阔 周振安 《Chinese Optics Letters》 SCIE EI CAS CSCD 2009年第3期191-193,共3页
A high sensitive fiber Bragg grating (FBG) strain sensor with automatic temperature compensation is demonstrated. FBG is axially linked with a stick and their free ends are fixed to the measured object. When the mea... A high sensitive fiber Bragg grating (FBG) strain sensor with automatic temperature compensation is demonstrated. FBG is axially linked with a stick and their free ends are fixed to the measured object. When the measured strain changes, the stick does not change in length, but the FBG does. When the temperature changes, the stick changes in length to pull the FBG to realize temperature compensation. In experiments, 1.45 times strain sensitivity of bare FBG with temperature compensation of less than 0.1 nm Bragg wavelength drift over 100 ℃ shift is achieved. 展开更多
关键词 Fiber optic components Fiber optic sensors SENSORS Temperature distribution
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A plating method for metal coating of fiber Bragg grating 被引量:8
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作者 李玉龙 张华 +1 位作者 冯艳 彭刚 《Chinese Optics Letters》 SCIE EI CAS CSCD 2009年第2期115-117,共3页
We present a method for metal coating optical fiber and in-fiber Bragg grating. The technology process which is based on electroless plating and electroplating method is described in detail. The fiber is firstly coate... We present a method for metal coating optical fiber and in-fiber Bragg grating. The technology process which is based on electroless plating and electroplating method is described in detail. The fiber is firstly coated with a thin copper or nickel plate with electroless plating method. Then, a thicker nickel plate is coated on the surface of the conductive layer. Under the optimum conditions, the surfaces of chemical plating and electroplating coatings are all smooth and compact. There is no visible defect found in the cross-section. Using this two-step metallization method, the in-fiber Bragg grating can be well protected and its thermal sensitivity can be enhanced. After the metallization process, the fiber sensor is successfully embedded in the 42CrMo steel by brazing method. Thus a smart metal structure is achieved. The embedding results show that the plating method for metallization protection of in-fiber Bragg grating is effective. 展开更多
关键词 Chromium alloys Electroless plating Fiber Bragg gratings Fiber optic components Fiber optic sensors Metallic films METALLIZING METALS Nickel alloys Plates (structural components) Protective coatings Structural metals
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A novel oil level monitoring sensor based on string tilted fiber Bragg grating 被引量:6
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作者 蒋奇 《Optoelectronics Letters》 EI 2011年第3期171-174,共4页
In this paper,we present a novel oil level monitoring sensor based on string tilted fiber Bragg grating(TFBG).The measurement range and sensitivity of oil level monitoring can be modulated via changing the length and ... In this paper,we present a novel oil level monitoring sensor based on string tilted fiber Bragg grating(TFBG).The measurement range and sensitivity of oil level monitoring can be modulated via changing the length and number of string tilted fiber gratings.The transmission spectrum of string TFBGs immersed in oil changes obviously with the oil level variation.Experiments are conducted on three 2 cm-length serial TFBGs with the same tilted angle of 10o.A sensitivity of 3.28 dB/cm in the string TFBG sensor is achieved with good linearity by means of TFBG spectrum characteristic with peak-low value.The cladding mode transmission power and the amplitude of high order cladding mode resonance are nearly linear to the oil level variation.This kind of sensor is insensitive to temperature and attributed to be employed in extremely harsh environment oil monitoring. 展开更多
关键词 Fiber Bragg gratings Fiber optic components Level measurement Plasma diagnostics SENSORS
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