检索结果-南通市图书馆

Observation of Quantum Beat in Rb by Parametric Four-Wave Mixing

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2007年第8期24卷 2234-2237页

作者：朱长军贺俊芳薛兵翟学军 Department of Physics School of Science Xi'an Polytechnic University Xi'an 710048 State Key Laboratory of Transient optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710119

Two coupled paralnetric four-wave-mixing processes in Rb atoms are studied using perturbation theory, which reveals clear evidence of tile appearance of quantum beat at 608cm^-1, corresponding to the energy difference of the 7s - 5d states of Rb atoms, in the parametric four-wave-mixing signals. A pump-probe technique is utilized to observe the quantum beat. Tinle-varying characteristics of the quantum beat are investigated using time-dependellt Fourier transform. The results show that the time-varying characteistics of the quantum beat not oldy offers a sensitive detecting method for observing the decay of atomic wave packets, but also provides a potential tool for monitoriHg the dissociation of molecules.

关键词： COHERENT CONTROL WAVE-PACKETS VAPOR RUBIDIUM SUPERFLUORESCENCE EXCITATION CONVERSION EMISSION

Three-dimensional optical storage in fused silica using modulated femtosecond pulses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese optics Letters 2004年第5期2卷 292-294页

作者：刘青程光华王屹山程昭赵卫陈国夫 State Key Laboratory of Transient optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068 College of Physics & Electrical Information Ningxia University Yinchuan 750021 State Key Laboratory of Transient optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068

Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a Ti:sapphire femtosecond laser modulated by binary digits is demonstrated. Laser pulses modulation is realized by modulating two circuits of trigger pulses signal which are used to control laser pulses trapping and switching out from cavity, respectively. Bits are optically readout in both a parallel reading (phase-contrast) and a serial reading (confocal-type) methods. The method for modulating laser pulses can also be used in all of pulsed laser systems which operate in cavity-dumping configuration.

关键词： Fused silica Laser pulses Optical recording Pulse modulation Sapphire Three dimensional

Femtosecond Laser Pulses for Drilling the Shaped Micro-Hole of Turbine Blades

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第4期30卷 77-80页

作者： JIA Hai-Ni YANG xiao-Jun ZHAO Wei ZHAO Hua-Long DU Xu YANG Yong xi'an institute of optics and {2. mechanics Chinese Academy of SciencesXi'an 710119 National Time Service Center Chinese Academy of SciencesXi'an 710600

We design a set of processing devices to drill the shaped holes of turbine blades by using a femtosecond laser which outputs 1064 nm 5 W pulses at 100 kHz,investigate the mechanism of the femtosecond laser interaction with metals,and demonstrate that ultrafast laser drilling has distinct strong points against electric spark and longer laser pulse *** advantages related to no recast layer,no thermal effect,no micro crack,high precision,and high processing efficiency are carried out.

关键词： Femto Turbine Pulse

Observation of Quantum Beating from Two Coupled Parametric Six-Wave Mixing Signals in Rb

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第9期25卷 3242-3245页

作者：朱长军贺俊芳翟学军薛兵 Department of Physics School of Science Xi'an Polytechnic University Xi'an 710048 State Key Laboratory of Transient optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Scienees Xi 'an 710119

Two processes of coupled difference-frequency axially phase-matched parametric six-wave mixing are carried out in Rb vapour by two-photon excitation Using fs laser pulses, and parametric six-wave mixing signals in the infrared and near infrared regime are detected. The infrared parametric six-wave mixing signals are up-converted into the visible spectral range by sum-frequency mixing with the pump laser in a LiIO3 crystal. Moreover, quantum beating at 608 cm^-1, corresponding to the 7s - 5d energy difference in Rb, is observed from the sum-frequency signal at 495nm. As a result, we obtain modulated light signals in the visible, near infrared and infrared spectral ranges, and study the interference between 7s and 5d states of Rb.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Imaging properties of a tetra wedge readout

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第6期20卷 534-539页

作者：刘永安鄢秋荣赛小锋韦永林盛立志杨颢胡慧君赵宝升 State Key Laboratory of Transient optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Graduate University Chinese Academy of Sciences

The decoding principle of a tetra wedge anode, which is a development of the wedge and strip anode, is described. The influence of charge cloud size on decoding accuracy is studied using the Monte Carlo method. Simulation results show that the decoding error is large when the size of charge clouds collected by the anode is small. Thus, the charge clouds collected by the tetra wedge anode should reach a necessary size to ensure accurate decoding. Finally, using the ultraviolet photon counting imaging system, the linearity and the spatial resolution of the system are tested. Experimental results show that the system has a good linearity and the spatial resolution is better than 100 μm.

关键词： detectors photon counting imaging tetra wedge anode microchannel plate

Mode field diameter and nonlinear properties of air-core nanowires

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第8期18卷 3183-3188页

作者：胡晓鸿赵卫宫永康王擂然卢克清刘雪明 State Key Laboratory of Transient optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

Exact solutions of Maxwell＇s equations describing the lightwave through 3-layer-structured cylindrical waveguide are obtained and the mode field diameter and nonlinear coefficient of air-core nanowires （ACNWs） are numerically calculated. The simulation results show that ACNWs offer some unique optical properties, such as tight field confining ability and extremely high nonlinearity. At a certain wavelength and air core radius, we optimize the waveguide design to maximize the nonlinear coefficient and minimize the mode field diameter. Our results show that the ACNWs may be powerful potential tools for novel micro-photonic devices in the near future.

关键词： waveguides nanowires numerical calculation fiber optics

Multi-exponentially Photoelectric Response of Bacteriorhodopsin

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第1期18卷 134-136页

作者： YAO Bao-Li XU Da-Lun HOU Xun HU Kun-Sheng WANG Ao-Jin State Key Laboratory of Transient optics and Technology Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710068 institute of Biophysics Chinese Academy of SciencesBeijing 100101

A thin oriented bacteriorhodopsin(bR)film is deposited on a stainless steel slide by use of the electrophoretic sedimentation method.A junction is made with electrolyte gels having a counterelectrode to construct a bR-based photoelectric *** photoelectric response signal to a 10ns laser pulse is measured.A theory on the photoelectric kinetics of bR is developed based on the concept of the charge displacement current and the bR photocycle rate *** between the theoretical and experimental results proves that the bR photoelectric response to a short laser pulse is a multi-exponential *** decay time constants and amplitudes of each exponential component are obtained by data fitting.

关键词： exponential photoelectric kinetics

The Monitoring System Using FOBG Sensor for The Health of the Rocket

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 791-792页

作者： Zhang xiangdong Li Yulin Wang Weiping WuCuiqin Hong xinhua xi’an institute of optics and {2. mechanics , cas,P.R.China,Tel:86-2.-8481385 Fax:86-2.-8484473, E-mail: zhangxiangdong2.2.*** High technical institute of Hongqin xi’an 71002. xi’an institute of optics and {2. mechanics CASP.R.China High technical institute of Hongqin xi'an 71002.

A novel heath monitoring system of the rocket based on fiber optic Bragg gratings is brought forward, its component units and working principle are also described.

关键词： of on it as by for been

Structured illumination microscopy for super-resolution and optical sectioning

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第12期59卷 1291-1307页

作者： Dan Dan Baoli Yao Ming Lei State Key Laboratory of Transient optics and Photonics Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences

Optical microscopy plays an essential role in biological studies due to its capability and compatibility of non-contact,minimally invasive observation and measurement of live ***,the conventional optical microscopy only has a spatial resolution about2.0 nm due to the Abbe diffraction limit,and also lacks the ability of three-dimensional ***-resolution farfield optical microscopy based on special illumination schemes has been dramatically developed over the last *** them,only the structured illumination microscopy(SIM)is of wide-field geometry that enables it easily compatible with the conventional optical *** this article,the principle of SIM was introduced in terms of point spread function(PSF)and optical transform function(OTF)of the optical *** SIM for super-resolution(SIM-SR)proposed by Gustafsson et *** the SIM for optical sectioning(SIM-OS)proposed by Neil et *** the most popular ones in the research community of *** have the same optical configuration,but with different data postprocessing *** mathematically described the basic theories for both of the SIMs,respectively,and presented some numerical simulations to show the effects of super-resolution and optical *** approaches to generation of structured illumination patterns were *** an example,a SIM system based on DMDmodulation and LED-illumination was demonstrated.A lateral resolution of 90 nm was achieved with gold *** optical sectioning capability of the microscope was demonstrated with Golgi-stained mouse brain neurons,and the sectioning strength of 930 nm was obtained.

关键词：光学显微镜光学切片超分辨率结构照明 SIM卡金纳米粒子成像能力光学传递函数