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High-precision high-voltage detuning system for HIAF-SRing electron target 被引量:1
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作者 Kai-Ming Yan Ming-Rui Li +9 位作者 Yun-Bin Zhou Xiao-Ming Ma Jin-Bin Shangguan Zhong-Kui Huang Xiao-Jun Wang Mei-Tang Tang Jie Gao Hou-Ke Huang Da-Qin Gao Li-Jun Mao 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第5期125-138,共14页
The development of a detuning system for the precision control of electron energy is a major challenge when electron targets are used in ion-storage rings.Thus,a high-precision,high-voltage,detuning system was develop... The development of a detuning system for the precision control of electron energy is a major challenge when electron targets are used in ion-storage rings.Thus,a high-precision,high-voltage,detuning system was developed for the electron target of a high-intensity heavy-ion accelerator facility-spectrometer ring(HIAF-SRing)to produce accurate electron-ion relative energies during experiments.The system consists of auxiliary,and high-voltage detuning power supplies.The front stage of the auxiliary power supply adopts an LCC resonant converter operating in the soft-switching state and an LC filter for a sinusoidal waveform output in the post-stage.The detuning power supply is a high-voltage pulse amplifier(HVPA)connected with a high-voltage DC(HVDC)module in series.In this paper,the design and development of the detuning system are described in detail,and the test bench is presented.The test results demonstrated that the detuning system conforms to the technical specifications of the dielectronic recombination(DR)experiment.Finally,a Fe15+DR spectrum was measured using the detuning system.The experimental data demonstrated a good experimental resolution and verified the reliability and feasibility of the design. 展开更多
关键词 detuning system Storage ring Dielectronic recombination
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Simulation research on surface growth process of positive and negative frequency detuning chromium atom lithographic gratings
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作者 尹志珺 唐朝辉 +9 位作者 谭文 肖光旭 姚玉林 薛栋柏 顾振杰 雷李华 顿雄 邓晓 程鑫彬 李同保 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第10期367-376,共10页
Chromium atom photolithography gratings are a promising technology for the development of nanoscale length standard substances due to their high accuracy,uniformity,and consistency.However,the inherent difference betw... Chromium atom photolithography gratings are a promising technology for the development of nanoscale length standard substances due to their high accuracy,uniformity,and consistency.However,the inherent difference between the interaction of positive and negative frequency detuning standing wave field and the atoms can cause a difference in the adjacent peak-to-valley heights of the grating in positive and negative frequency detuning chromium atom lithography,which greatly reduces its accuracy.In this study,we performed a controlled variable growth simulation using the semi-classical theoretical model and Monte Carlo method with trajectory tracking and ballistic deposition methods to investigate the influence of key experimental parameters on the surface growth process of positive and negative frequency detuning atomic lithography gratings.We established a theoretical model based on simulation results and summarized empirical equations to guide the selection of experimental parameters.Our simulations achieved uniform positive and negative frequency detuning atomic lithography gratings with a period of 1/4 of the wavelength corresponding to the atomic transition frequency,and adjacent peak-to-valley heights differing by no more than 2 nm,providing an important theoretical reference for the controllable fabrication of these gratings. 展开更多
关键词 self-traceable grating atom lithography positive and negative frequency detuning surface growth
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The influences of dipole-dipole interaction and detuning on the sudden death of entanglement between two atoms in the Tavis-Cummings model 被引量:4
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作者 陈丽 邵晓强 张寿 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第3期888-893,共6页
The influences of dipole-dipole interaction and detuning on the entanglement between two atoms with different initial tripartite entangled W-like states in the Tavis Cummings model have been investigated by means of W... The influences of dipole-dipole interaction and detuning on the entanglement between two atoms with different initial tripartite entangled W-like states in the Tavis Cummings model have been investigated by means of Wootters' concurrence, respectively. The results show that the entanglement between the two atoms can be enhanced via appropriately tuning the strength of dipole-dipole interaction of two atoms or the detunings between atom and cavity, and the so-called sudden death effect can he weakened simultaneously. 展开更多
关键词 CONCURRENCE sudden death of entanglement dipole-dipole interaction detuning
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A non-invasive diagnostic method of cavity detuning based on a convolutional neural network 被引量:2
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作者 Liu-Yuan Zhou Hao Zha +4 位作者 Jia-Ru Shi Jia-Qi Qiu Chuan-Jing Wang Yun-Sheng Han Huai-Bi Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第7期25-35,共11页
As modern accelerator technologies advance toward more compact sizes,conventional invasive diagnostic methods of cavity detuning introduce negligible interference in measurements and run the risk of harming structural... As modern accelerator technologies advance toward more compact sizes,conventional invasive diagnostic methods of cavity detuning introduce negligible interference in measurements and run the risk of harming structural surfaces.To overcome these difficulties,this study developed a non-invasive diagnostic method using knowledge of scattering parameters with a convolutional neural network and the interior point method.Meticulous construction and training of the neural network led to remarkable results on three typical acceleration structures:a 13-cell S-band standing-wave linac,a 12-cell X-band traveling-wave linac,and a 3-cell X-band RF gun.The trained networks significantly reduced the burden of the tuning process,freed researchers from tedious tuning tasks,and provided a new perspective for the tuning of side-coupling,semi-enclosed,and total-enclosed structures. 展开更多
关键词 Cavity detuning Convolutional neural network Equivalent circuit
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Synchronously Pumped Mode-Locked 1.89 μm Tm-Doped Fiber Laser with High Detuning Toleration 被引量:1
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作者 Gen Li Yong Zhou +4 位作者 Shu-aie Li PeiJun Yao Wei-qing Gao Chun Gu Li-Xin Xu 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第11期35-37,共3页
We propose and demonstrate a synchronously pumped mode-locked Tm-doped fiber(TDF) laser without any extra mode-locking elements. Pumped by a 1.56 μm pulse fiber laser, the TDF laser generates 1.17 ps pulses with a ... We propose and demonstrate a synchronously pumped mode-locked Tm-doped fiber(TDF) laser without any extra mode-locking elements. Pumped by a 1.56 μm pulse fiber laser, the TDF laser generates 1.17 ps pulses with a spectral width of 9.7 nm and a repetition rate of 9.33 MHz. The emission wavelength is tunable along with the cavity length detuning in a wide range of 3 mm. The high detuning toleration is beneficial to achieve high temperature and vibration stability in all-fiber configuration lasers. 展开更多
关键词 TDF RBW KHZ m Tm-Doped Fiber Laser with High detuning Toleration Synchronously Pumped Mode-Locked 1.89 Tm
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The squeezing dynamics of two independent atoms by detuning in two non-Markovian environments
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作者 邹红梅 方卯发 杨百元 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第12期82-86,共5页
The squeezing dynamics of two independent two-level atoms off-resonantly coupled to two non-Markovian reservoirs is studied by the time-convolutionless master-equation approach. We find that the squeezing of two atoms... The squeezing dynamics of two independent two-level atoms off-resonantly coupled to two non-Markovian reservoirs is studied by the time-convolutionless master-equation approach. We find that the squeezing of two atoms is dependent on both detuning and the non-Markovian effect. Our results show that, in the non-Markovian regime, the bigger the detuning and the stronger the non-Markovian effect are, the larger the strength of the squeezing is. And the squeezing of two atoms can be effectively protected for a long time when both the non-Markovian effect and detuning are present simultaneously. The physical mechanism is that the detuning not only can promote the feedback of information from the environment into the atomic system but also can greatly suppress the atomic decay in the non-Markovian regime. 展开更多
关键词 non-Markovian effect detuning squeezing two-level atom
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Effect of cavity length detuning on the output characteristics for the middle infrared FEL oscillator of FELiChEM 被引量:2
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作者 赵周宇 李和廷 贾启卡 《Chinese Physics C》 SCIE CAS CSCD 2017年第10期139-144,共6页
FELiChEM is an infrared free electron laser(FEL) facility currently under construction, which consists of two oscillators generating middle-infrared and far-infrared laser covering the spectral range of 2.5–200 μm... FELiChEM is an infrared free electron laser(FEL) facility currently under construction, which consists of two oscillators generating middle-infrared and far-infrared laser covering the spectral range of 2.5–200 μm. In this paper, we numerically study the output characteristics of the middle-infrared oscillator with accurate cavity length detuning. Emphasis is put on the temporal structure of the micropulse and the corresponding spectral bandwidth.Taking the radiation wavelengths of 50 μm and 5 μm as examples, we show that the output pulse duration can be tuned in the range of 1–6 ps with corresponding bandwidth of 13%–0.2% by adjusting the cavity length detuning.In addition, a special discussion on the comb structure is presented, and it is indicated that the comb structure may arise in the output optical pulse when the normalized slippage length is much smaller than unity. This work has reference value for the operation of FELiChEM and other FEL oscillators. 展开更多
关键词 free electron laser oscillator cavity length detuning output characteristics comb structure
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Preparation of entangledW states based on the cavity QED system
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作者 Ke Li Jun-Long Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第9期290-296,共7页
We present a qubit-loss-free(QLF)fusion scheme for generating large-scale atom W states in cavity quantum electrodynamics(QED)system.Compared to the most current fusion schemes which are conditioned on the case where ... We present a qubit-loss-free(QLF)fusion scheme for generating large-scale atom W states in cavity quantum electrodynamics(QED)system.Compared to the most current fusion schemes which are conditioned on the case where one particle can be extracted from each initial W state to the fusion process,our scheme will access one or two particles from each W state.Based on the atom–cavity-field detuned interaction,three jWin+m+t states can be generated from the jWin,jWim,and jWit states with the help of two auxiliary atoms,and three jWin+m+t+q states can be generated from jWin,jWim,jWit,and a jWiq state with the help of three auxiliary atoms.Comparing the numerical simulations of the resource cost of fusing three small-size W states based on the previous schemes,our fusion scheme seems to be more efficient.This QLF fusion scheme can be generalized to the case of fusing k different or identical particle W states.Furthermore,with no qubit loss,it greatly reduces the number of fusion steps and prepares W states with larger particle numbers. 展开更多
关键词 W state detuned interaction state fusion cavity quantum electrodynamics
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Detuning Tolerance of 50 GHz-Spaced 40 Gbit/s-Based DWDM System
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作者 Keiji Tanaka Noboru Edagawa 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期552-553,共2页
Impact of detuning between signal wavelength and MUX/DEMUX filter passband in WDM systems was numerically studied for 50 GHz-spaced 42.7 Gbit/s RZ and CS-RZ signals. RZ signal was found more robust against signal wave... Impact of detuning between signal wavelength and MUX/DEMUX filter passband in WDM systems was numerically studied for 50 GHz-spaced 42.7 Gbit/s RZ and CS-RZ signals. RZ signal was found more robust against signal wavelength detuning but not against filter detuning. 展开更多
关键词 DWDM as detuning Tolerance of 50 GHz-Spaced 40 Gbit/s-Based DWDM System of GHZ
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Large Detuning Limit for the Multipartite Systems Interacting with Electromagnetic Fields
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作者 李虹轶 吴春旺 +1 位作者 陈平形 李承祖 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第4期411-416,共6页
We study the dynamics of the multipartite systems nonresonantly interacting with electromagnetic fields, focusing on the large detuning limit for the effective Hamiltonian. Due to the many-particle interference effect... We study the dynamics of the multipartite systems nonresonantly interacting with electromagnetic fields, focusing on the large detuning limit for the effective Hamiltonian. Due to the many-particle interference effects, the more rigorous large detuning condition for neglecting the rapidly oscillating terms for the effective Plamiltonian should be △ 〉〉 N^1/2 g, instead of △ 〉〉 g usually used in the literature even in the case of multipartite systems, with N the number of microparticles involved, g the coupling strength, A the detuning. This result is significant since merely the satisfaction of the original condition will result in the invalidity of the effective Hamiltonian and the errors of the parameters associated with the detuning in the multipartite case. 展开更多
关键词 multipartite system effective Hamiltonian large detuning
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Optimization of single-step tapering amplitude and energy detuning for high-gain FELs
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作者 李和廷 贾启卡 《Chinese Physics C》 SCIE CAS CSCD 2015年第1期109-112,共4页
We put forward a method to optimize the single-step tapering amplitude of undulator strength and initial energy tuning of electron beam to maximize the saturation power of high gain free-electron lasers (FELs), base... We put forward a method to optimize the single-step tapering amplitude of undulator strength and initial energy tuning of electron beam to maximize the saturation power of high gain free-electron lasers (FELs), based on the physics of longitudinal electron beam phase space. Using the FEL simulation code GENESIS, we numerically demonstrate the accuracy of the estimations for parameters corresponding to the linac coherent light source and the Tesla test facility. 展开更多
关键词 step-tapering energy detuning high-gain FELs
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Study on the Lorentz detuning and tuning of β=0.3,352 MHz spoke cavity
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作者 肖永川 傅世年 《Chinese Physics C》 SCIE CAS CSCD 2009年第9期815-818,共4页
The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of the high power proton linac for the Accelerator Driven Sub-critical System in China. In this paper, the basic ge... The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of the high power proton linac for the Accelerator Driven Sub-critical System in China. In this paper, the basic geometric and RF parameters of a β=0.3, 352 MHz spoke cavity are given, and the Lorenz detuning and tuning are presented. 展开更多
关键词 Lorentz force detuning spoke cavity proton linac
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Lorentz detuning and tuning system study of 3+1/2cell DC-SC photo-injector for PKU-FEL
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作者 徐文灿 全胜文 +1 位作者 赵夔 朱凤 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第3期215-217,共3页
A 3+1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell DC-SC photo-injector. The Lorentz detuning and tuning structure for the 3+1/2cell ... A 3+1/2cell DC-SC photo-injector for PKU-FEL facility is under development, which is an upgrade design of the successful 1-4-1/2cell DC-SC photo-injector. The Lorentz detuning and tuning structure for the 3+1/2cell superconducting cavity is presented in this paper. The Lorentz force detuning coefficient is 1.2 Hz/(MV/m)^2 with double stiffening rings for the half cell and single stiffening rings between the adjacent TESLA cells. With the special stiffening structure, the 3+1/2cell whole cavity needs only one tuner. The influences of the tuning on frequency shift, field flatness and average gradient are discussed in this paper. The simulation results show that the stiffening rings' design is successful. 展开更多
关键词 3+1/2cell DC-SC photo-injector Lorentz detuning tuning structure
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Research on the detuning system of a cooling electron beam for the dielectronic recombination experiment at CSRm
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作者 孟令杰 马新文 +11 位作者 V.V.Parkhomchuk 杨晓东 V.B.Reva 李杰 冒立军 马晓明 晏太来 夏佳文 原有进 徐瑚珊 杨建成 肖国青 《Chinese Physics C》 SCIE CAS CSCD 2013年第1期117-124,共8页
The storage ring equipped with an electron cooler is an ideal platform for dielectronic recombination (DR) experiments. In order to fulfill the requirement of DR measurements at the main Cooler Storage Ring, a detun... The storage ring equipped with an electron cooler is an ideal platform for dielectronic recombination (DR) experiments. In order to fulfill the requirement of DR measurements at the main Cooler Storage Ring, a detuning system for the precision control of the relative energy between the ion beam and the electron beam has been installed on the electron cooler device. The test run using 7.0 MeV/u C6+ beam was performed with recording the Schottky spectra and the ion beam currents. The influence of pulse heights and widths of the detuning voltage on the ion beam was analyzed. For the small pulse height, the experimental results from the Schottky spectra were in good agreement with the theoretical results. The frequency shift in the Schottky spectra was significantly reduced for the short pulse width. For the large pulse height, an oscillation phenomenon was observed and some effective ways to reduce the oscillation were pointed out. The detailed description of the phenomenon and the theoretical model based on the plasma oscillation was discussed in this paper. The overall results show that the new detuning system works properly, and could fulfill the requirements of future DR experiment. 展开更多
关键词 detuning system electron cooling Schottky spectrum plasma oscillation dielectronic recombination
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Modulation bandwidth enhancement in monolithic integrated two-section DFB lasers based on the detuned loading effect
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作者 Yunshan Zhang Yifan Xu +7 位作者 Shijian Guan Jilin Zheng Hongming Gu Lianyan Li Rulei Xiao Tao Fang Hui Zou Xiangfei Chen 《Journal of Semiconductors》 EI CAS CSCD 2023年第11期52-58,共7页
Modulation bandwidth enhancement in a directly modulated two-section distributed feedback(TS-DFB)laser based on a detuned loading effect is investigated and experimentally demonstrated.The results show that the 3-dB b... Modulation bandwidth enhancement in a directly modulated two-section distributed feedback(TS-DFB)laser based on a detuned loading effect is investigated and experimentally demonstrated.The results show that the 3-dB bandwidth of the TS-DFB laser is increased to 17.6 GHz and that chirp parameter can be reduced to 2.24.Compared to the absence of a detuned loading effect,there is a 4.6 GHz increase and a 2.45 reduction,respectively.After transmitting a 10 Gb/s non-return-to-zero(NRZ)signal through a 5-km fiber,the modulation eye diagram still achieves a large opening.Eight-channel laser arrays with precise wavelength spacing are fabricated.Each TS-DFB laser in the array has side mode suppression ratios(SMSR)>49.093 dB and the maximum wavelength residual<0.316 nm. 展开更多
关键词 distributed feedback(DFB)laser detuned loading effect direct modulation
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High-speed directly modulated distributed feedback laser based on detuned loading and photon-photon resonance effect
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作者 张云山 徐逸帆 +3 位作者 郑吉林 李连艳 方涛 陈向飞 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期274-281,共8页
A monolithic integrated two-section distributed feedback(TS-DFB)semiconductor laser for high-speed direct modulation is proposed and analyzed theoretically.The grating structure of the TS-DFB laser is designed by the ... A monolithic integrated two-section distributed feedback(TS-DFB)semiconductor laser for high-speed direct modulation is proposed and analyzed theoretically.The grating structure of the TS-DFB laser is designed by the reconstructionequivalent-chirp(REC)technique,which can reduce the manufacturing cost and difficulty,and achieve high wavelength controlling accuracy.The detuned loading effect and the photon-photon resonance(PPR)effect are utilized to enhance the modulation bandwidth of the TS-DFB laser,exceeding 37 GHz,while that of the conventional one-section DFB laser is only 16 GHz.When the bit rate of the non-return-to-zero(NRZ)signal reaches 55 Gb/s,a clear eye diagram with large opening can still be obtained.These results show that the proposed method can enhance the modulation bandwidth of DFB laser significantly. 展开更多
关键词 directly modulated laser(DML) detuned loading effect photon-photon resonance(PPR)effect reconstruction-equivalent-chirp(REC)technique
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Quantum dynamic behaviour in a coupled cavities system 被引量:4
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作者 彭俊 邬云文 李小娟 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期26-32,共7页
The dynamic behaviour of the two-site coupled cavities model which is doped with ta wo-level system is investi-gated. The exact dynamic solutions in the general condition are obtained via Laplace transform. The simple... The dynamic behaviour of the two-site coupled cavities model which is doped with ta wo-level system is investi-gated. The exact dynamic solutions in the general condition are obtained via Laplace transform. The simple analytical solutions are obtained in several particular cases, which demonstrate the clear and simple physical picture for the quan-tum state transition of the system. In the large detuning or hoppling case, the quantum states transferring between qubits follow a slow periodic oscillation induced by the very weak excitation of the cavity mode. In the large coupling case, the system can be interpreted as two Jaynes-Cummings model subsystems which interact through photon hop between the two cavities. In the case of λ≈△〉〉 g, the quantum states transition of qubits is accompanied by the excitation of the cavity, and the cavity modes have the same dynamic behaviours and the amplitude of probability is equM to 0.25 which does not change with the variation of parameter. 展开更多
关键词 coupled cavities quantum dynamics behaviour detuning two-level system
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Stable single-mode operation of 894.6 nm VCSEL at high temperatures for Cs atomic sensing 被引量:4
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作者 向磊 张星 +3 位作者 张建伟 宁永强 Werner Hofmann 王立军 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第7期130-133,共4页
In this paper, stable single-mode operation at high temperatures is produced by the surface-relief-integrated vertical cavity surface emitting laser(VCSEL). The gain-cavity mode detuning technique is employed to rea... In this paper, stable single-mode operation at high temperatures is produced by the surface-relief-integrated vertical cavity surface emitting laser(VCSEL). The gain-cavity mode detuning technique is employed to realize high operating temperatures for the VCSEL. The surface relief is etched in the centre of the top side as a mode discriminator for the fundamental mode output, and the threshold current minimum is 1.94 mA at high temperatures by the gain-cavity mode detuning technique. Maximum single-fundamental-mode output power of 0.45 mW at 80℃ is obtained, and the side mode suppression ratios(SMSRs) are more than 30 dB with increasing temperature and current, respectively. 展开更多
关键词 single-mode operation surface relief gain-cavity mode detuning vertical cavity surface emitting laser(VCSEL)
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Spectrum of the Micromaser with Kerr Medium 被引量:3
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作者 WUShu-Dong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第5期637-640,共4页
We have established the master equation for the micromaser with Kerr medium field density operator, studied the spectrum of the micromaser with Kerr medium and analyzed the influence of Kerr effect and the detuning on... We have established the master equation for the micromaser with Kerr medium field density operator, studied the spectrum of the micromaser with Kerr medium and analyzed the influence of Kerr effect and the detuning on the spectrum. In the thermal-atom regime, we find that Kerr effect broadens linewidth D and increases frequency-shift S, and that the detuning Δ narrows linewidth D and increases frequency-shift S as a whole. Moreover Kerr effect leads to oscillatings more rapidly in the resonance peaks, which means that it causes quantum noise. As a whole, with the increase of cavity-length L, the linewidth D and frequency-shift S gradually increase. 展开更多
关键词 MICROMASER SPECTRUM thermal-atom regime Kerr medium detuning
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Frequency sensitivity of the passive third harmonic superconducting cavity for SSRF 被引量:2
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作者 Xiao-Yun Pu Hong-Tao Hou +4 位作者 Yan Wang Zheng Li Jing Shi Yu-Bin Zhao Jian-Fei Liu 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第3期85-93,共9页
A 1.5 GHz passive third harmonic superconducting cavity was proposed to improve the beam quality and lifetime in the Shanghai Synchrotron Radiation Facility Phase-II beamline project.Lifetime improvement highly depend... A 1.5 GHz passive third harmonic superconducting cavity was proposed to improve the beam quality and lifetime in the Shanghai Synchrotron Radiation Facility Phase-II beamline project.Lifetime improvement highly depends on the resonant frequency of the passive third harmonic superconducting cavity.It is important that the operating frequency of the cavity is within the design range and the cavity has reasonable mechanical stability.A simulation method for the multiphysics coupled analysis has been developed based on the ANSYS code.Multiphysics coupled simulations have been performed under different conditions,such as etching,evacuation,cooling,and preloading.Analyses of mechanical modes and structural stress have been executed.A possible stiffening ring method for the two-cell superconducting niobium cavity has been investigated.In this paper,we present a multiphysics coupled analysis of the third harmonic cavity using a finite element analysis code.The results of the analysis show that a reliable frequency for the cavity after electron beam welding is 1498.033 MHz,and the corresponding frequency of the pre-tuning goal is 1496.163 MHz.A naked cavity is a reasonable option based on structural stress and mechanical modal analyses.A frequency range of±500 kHz and limiting tolerable displacement of±0.35 mm are proposed for the design of the frequency tuner. 展开更多
关键词 Superconducting cavity Passive harmonic cavity Frequency detuning Frequency tuner Multiphysics analysis
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