Journals >Chinese Optics Letters
Contents
2016
Volume: 14 Issue 7
23 Article(s)
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Atomic and Molecular Physics
Smooth Archimedean-spiral ring waveguide for cold atomic gyroscope
Xiaojun Jiang, Xiaolin Li, Haichao Zhang, and Yuzhu Wang
We propose a robust scheme that creates a toroidal magnetic potential on a single-layer atom chip. The wire layout consists of two interleaved Archimedean spirals, which avoids the trapping perturbation caused by the input and output ports. By using a rotation bias field, the minimum of the time-averaged orbiting potenWe propose a robust scheme that creates a toroidal magnetic potential on a single-layer atom chip. The wire layout consists of two interleaved Archimedean spirals, which avoids the trapping perturbation caused by the input and output ports. By using a rotation bias field, the minimum of the time-averaged orbiting potential is lifted from zero, and then a relatively smooth and harmonic ring trap is formed. The location of the waveguide is immune to the magnetic variations, as it is only determined by the wire layout. The ring waveguide offers an ideal solution to developing a compact and portable atomic gyroscope..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070201 (2016)
Cold atoms passing through a thin laser beam: a Fourier optics approach
Shuyu Zhou, Jun Qian, Shanchao Zhang, and Yuzhu Wang
A Fourier optics approach can be a concise and powerful tool to solve problems in atom optics. In this report, we adopt it to investigate the kinetic behavior of cold atoms passing through a far red-detuned Gaussian beam. We demonstrate that the aberration has significant influence on the evolution of the atomic cloud,A Fourier optics approach can be a concise and powerful tool to solve problems in atom optics. In this report, we adopt it to investigate the kinetic behavior of cold atoms passing through a far red-detuned Gaussian beam. We demonstrate that the aberration has significant influence on the evolution of the atomic cloud, which is rooted in the deviation of the Gaussian profile from the quadratic form. In particular, we observe an intriguing effect analogous to Fresnel’s double prism with cold atoms. The experimental results are in good agreement with the numerical simulation..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070202 (2016)
COHERENCE OPTICS and STATISTICAL OPTICS
Motion de-blurring by second-order intensity-correlated imaging
Zunwang Bo, Wenlin Gong, and Shensheng Han
For a Hanbury Brown and Twiss system, the influence of relative motion between the object and the detection plane on the resolution of second-order intensity-correlated imaging is investigated. The analytical results, which are backed up by experiments, demonstrate that the amplitude and mode of the object’s motion havFor a Hanbury Brown and Twiss system, the influence of relative motion between the object and the detection plane on the resolution of second-order intensity-correlated imaging is investigated. The analytical results, which are backed up by experiments, demonstrate that the amplitude and mode of the object’s motion have no effect on the second-order intensity-correlated imaging and that high-resolution imaging can be always achieved by using a phase-retrieval method from the diffraction patterns. The use of motion de-blurring imaging for this approach is also discussed..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070301 (2016)
Holography
Fast reconstruction of digital holograms for extended depths of field
P. W. M. Tsang, T.-C. Poon, T. Kim, and Y. S. Kim
Past research has demonstrated that a static, three-dimensional (3D) object scene can be directly recorded as a complex digital hologram. However, numerical reconstruction of the object scene, which may comprise multiple sections located at unknown distances from the hologram, is a complicated and computation-intensivePast research has demonstrated that a static, three-dimensional (3D) object scene can be directly recorded as a complex digital hologram. However, numerical reconstruction of the object scene, which may comprise multiple sections located at unknown distances from the hologram, is a complicated and computation-intensive process. To the best of our knowledge, we propose, for the first time, a low complexity method that is capable of reconstructing a complex hologram, such that sections at different depths in the 3D object scene can be automatically reconstructed at the correct focal distances and merged into a single image for an extended depth of field. We demonstrate an order of magnitude increase of the depth of field for binary objects. With the use of a graphical processing unit, the reconstruction of a 512 × 512
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070901 (2016)
Instrumentation, Measurement, and Metrology
Long-range laser ranging using superconducting nanowire single-photon detectors
Li Xue, Ming Li, Labao Zhang, Dongsheng Zhai... and Peiheng Wu|Show fewer author(s)
We demonstrate laser-ranging results for non-cooperative targets at ranges of 237 m and 19 km using superconducting nanowire single-photon detectors (SSPD). We upgrade the kilohertz rate laser-ranging system with a newly developed SSPD module, and the equivalent detection diameter is enlarged to 50 μm with a fiber and We demonstrate laser-ranging results for non-cooperative targets at ranges of 237 m and 19 km using superconducting nanowire single-photon detectors (SSPD). We upgrade the kilohertz rate laser-ranging system with a newly developed SSPD module, and the equivalent detection diameter is enlarged to 50 μm with a fiber and micro-lenses. Both retroreflectors and non-cooperative surfaces of aluminum foil, a solar panel, and a concrete panel at distances of 237 m and 19 km, whose echoes are of single-photon level, are ranged with sub-centimeter precision. Experimental signal-to-noise ratio curves with the product of quantum efficiency and system transmittance are obtained, which indicates that our system, with an average laser power of 0.8 W and a receiving aperture of 1.2 m, may be capable for space debris ranging at a distance of 800 km. This work suggests that SSPDs have the potential to be used for space debris surveillance..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071201 (2016)
Improved phase-shifting diffraction interferometer for microsphere topography measurements
Guodong Liu, Binghui Lu, Heyi Sun, Bingguo Liu... and Zhitao Zhuang|Show fewer author(s)
In this study, an improved phase-shifting diffraction interferometer for measuring the surface topography of a microsphere is developed. A common diode-pumped solid state laser is used as the light source to facilitate apparatus realization, and a new polarized optical arrangement is designed to filter the bias light fIn this study, an improved phase-shifting diffraction interferometer for measuring the surface topography of a microsphere is developed. A common diode-pumped solid state laser is used as the light source to facilitate apparatus realization, and a new polarized optical arrangement is designed to filter the bias light for phase-shifting control. A pinhole diffraction self-calibration method is proposed to eliminate systematic errors introduced by optical elements. The system has an adjustable signal contrast and is suitable for testing the surface with low reflectivity. Finally, a spherical ruby probe of a coordinate measuring machine is used as an example tested by the new phase-shifting diffraction interferometer system and the WYKO scanning white light interferometer for experimental comparison. The measured region presents consistent overall topography features, and the resulting peak-to-valley value of 84.43 nm and RMS value of 18.41 nm are achieved. The average roughness coincides with the manufacturer’s specification value..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071202 (2016)
Lasers and Laser Optics
Stable single-mode operation of injection-seeded Q -switched Nd:YAG laser by sine voltage modulation
Yongfei Gao, Junxuan Zhang, Huaguo Zang, Xiaolei Zhu... and Weibiao Chen|Show fewer author(s)
Based on the modified ramp and fire technique, a novel injection seeding approach with real-time resonance tracking is successfully demonstrated in a single-frequency Nd:YAG pulsed laser. Appling a high-frequency sinusoidal modulation voltage to one piezo actuator and an adjustable DC voltage to another piezo actuator Based on the modified ramp and fire technique, a novel injection seeding approach with real-time resonance tracking is successfully demonstrated in a single-frequency Nd:YAG pulsed laser. Appling a high-frequency sinusoidal modulation voltage to one piezo actuator and an adjustable DC voltage to another piezo actuator for active feedback, single-mode laser output with high-frequency stability is obtained, and the effect of the piezo hysteresis on the frequency stability can be eliminated for a laser diode pumped Q
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071401 (2016)
Comparison of signal-resonant and idler-resonant KTA-SROs
Fen Bai, Qingpu Wang, Zhaojun Liu, Zhiyong Jiao... and Hui Zhang|Show fewer author(s)
Two types of acousto-optically Q-switched Nd:YVO4/KTA singly resonated optical parametric oscillators are performed. One is signal resonant, where a 1.5 μm wave resonates while a 3.5 μm wave does not. The other is idler resonant, where a 3.5 μm wave resonates while a 1.5 μm wave does not. All the experimental elements Two types of acousto-optically Q Nd : YVO 4 / KTA
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071402 (2016)
External cavity diode laser as a stable-frequency light source for application in laser cooling of molecules
Xiuxiu Yang, Yanning Yin, Xingjia Li, Supeng Xu... and Jianping Yin|Show fewer author(s)
We demonstrate a scheme to use a Littman configuration external cavity diode laser (ECDL) as a stable-frequency light source to stabilize two cw single-mode Ti:sapphire lasers for laser cooling of magnesium fluoride molecules. An ECDL based on the Littman configuration is constructed and stabilized by a digital signal We demonstrate a scheme to use a Littman configuration external cavity diode laser (ECDL) as a stable-frequency light source to stabilize two cw single-mode Ti:sapphire lasers for laser cooling of magnesium fluoride molecules. An ECDL based on the Littman configuration is constructed and stabilized by a digital signal processor system. We stabilize the frequency of our ECDL to ± 0.77 MHz 2.6 × 10 11 ± 2.5 MHz
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071403 (2016)
MoS2 saturable absorber for single frequency oscillation of highly Yb-doped fiber laser
Baole Lu, Limei Yuan, Xinyuan Qi, Lei Hou... and Jintao Bai|Show fewer author(s)
In this Letter, a single-frequency fiber laser using a molybdenum disulfide (MoS2) thin film as a saturable absorber is demonstrated. We use a short length of highly Yb-doped fiber as the gain medium and a fiber ferrule with MoS2 film adhered to it by index matching gel (IMG) that acts as the saturable absorber. The saIn this Letter, a single-frequency fiber laser using a molybdenum disulfide (MoS 2 MoS 2 ～ 60 dB
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071404 (2016)
Diffraction and Gratings
Generation of polarization vortex beams by segmented quarter-wave plates
Jingtao Xin, Xiaoping Lou, Zhehai Zhou, Mingli Dong, and Lianqing Zhu
A spatially variable retardation device, an SQWP, is designed to generate polarization vortex beams. The transformation of Laguerre–Gaussian beams by the SQWP is further studied, and it is found that the SQWPs can also be used to generate helical beams and measure the topological charges of helical beams.A spatially variable retardation device, an SQWP, is designed to generate polarization vortex beams. The transformation of Laguerre–Gaussian beams by the SQWP is further studied, and it is found that the SQWPs can also be used to generate helical beams and measure the topological charges of helical beams..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070501 (2016)
Fiber Optics and Optical Communications
United block sequence mapping-based visible light positioning for dense small cell deployment
Runmei Zhao, Zhitong Huang, Yuxin Liu, and Yuefeng Ji
Visible light positioning (VLP) is an emerging candidate for indoor positioning, which can simultaneously meet the requirements for accuracy, cost, coverage area, and security. However, intercell interference caused by light intensity superposition limits the application of VLP. In this Letter, we propose a united blocVisible light positioning (VLP) is an emerging candidate for indoor positioning, which can simultaneously meet the requirements for accuracy, cost, coverage area, and security. However, intercell interference caused by light intensity superposition limits the application of VLP. In this Letter, we propose a united block sequence mapping (UBSM)-based VLP that utilizes superposition to integrate the multidimensional information from dense small cells into 2D information. The experimental result shows that UBSM-based VLP can achieve an accuracy of 1.5 cm with a 0.4 m row spacing and 0.35 m column spacing of LED lights..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070601 (2016)
Simultaneous frequency transfer and time synchronization over a 430 km fiber backbone network using a cascaded system
Qin Liu, Shenglong Han, Jialiang Wang, Zitong Feng... and Shensheng Han|Show fewer author(s)
Based on dense wavelength-division multiplexing technology, frequency transfer and time synchronization are simultaneously realized over a compensated cascaded fiber link of 430 km, which is a part of the Beijing–Shanghai optical fiber backbone network. The entire cascaded system consists of two stages with fiber linksBased on dense wavelength-division multiplexing technology, frequency transfer and time synchronization are simultaneously realized over a compensated cascaded fiber link of 430 km, which is a part of the Beijing–Shanghai optical fiber backbone network. The entire cascaded system consists of two stages with fiber links of 280 and 150 km, respectively. To keep high symmetry and low noise, specific bi-directional erbium-doped fiber amplifiers are used to compensate the large optical attenuation of each fiber link. When the compensation servo is active in every stage, the cascaded system achieves the stability of 1.94 × 10 13 1.34 × 10 16 10 4 s
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070602 (2016)
Imaging Systems
Analysis of Strehl ratio limit with superresolution binary phase filters
Vidal F. Canales, Pedro J. Valle, and Manuel P. Cagigal
Several pupil filtering techniques have been developed in the last few years to obtain transverse superresolution (a narrower point spread function core). Such a core decrease entails two relevant limitations: a decrease of the peak intensity and an increase of the sidelobe intensity. Here, we calculate the Strehl ratiSeveral pupil filtering techniques have been developed in the last few years to obtain transverse superresolution (a narrower point spread function core). Such a core decrease entails two relevant limitations: a decrease of the peak intensity and an increase of the sidelobe intensity. Here, we calculate the Strehl ratio as a function of the core size for the most used binary phase filters. Furthermore, we show that this relation approaches the fundamental limit of the attainable Strehl ratio at the focal plane for any filter. Finally, we show the calculation of the peak-to-sidelobe ratio in order to check the system viability in every application..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071101 (2016)
Optoelectronics
Nonlocal response of electric and magnetic modes in a silver cuboid dimer
Xianghao Zeng, Yong Wang, Yonghua Lu, and Pei Wang
The nonlocal effect on the spontaneous emission of a silver cuboid dimer is investigated using a local analog model. Magnetic as well as electric dipole excitations are introduced to excite different gap modes. The nonlocal response of electric and magnetic modes on various parameters of gap (width and refractive indexThe nonlocal effect on the spontaneous emission of a silver cuboid dimer is investigated using a local analog model. Magnetic as well as electric dipole excitations are introduced to excite different gap modes. The nonlocal response of electric and magnetic modes on various parameters of gap (width and refractive index) are investigated. Unidirectional radiation is achieved by the interaction between electric and magnetic modes in both local and nonlocal models. Compared to local simulations, the resonant wavelength is blue shifted and the spontaneous emission enhancement is weakened in the nonlocal model. The relative shifts of the resonant wavelengths get larger in smaller gaps with a higher refractive index..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 072501 (2016)
Medical Optics and Biotechnology
GPU accelerated simplified harmonic spherical approximation equations for three-dimensional optical imaging
Shenghan Ren, Xueli Chen, Xu Cao, Shouping Zhu, and Jimin Liang
Simplified spherical harmonics approximation (SPN) equations are widely used in modeling light propagation in biological tissues. However, with the increase of order N, its computational burden will severely aggravate. We propose a graphics processing unit (GPU) accelerated framework for SPN equations. Compared with thSimplified spherical harmonics approximation (SPN) equations are widely used in modeling light propagation in biological tissues. However, with the increase of order N
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071701 (2016)
Early-photon guided reconstruction method for time-domain fluorescence lifetime tomography
Lin Zhang, Chuangjian Cai, Yanlu Lv, and Jianwen Luo
A reconstruction method guided by early-photon fluorescence yield tomography is proposed for time-domain fluorescence lifetime tomography (FLT) in this study. The method employs the early-arriving photons to reconstruct a fluorescence yield map, which is utilized as a priori information to reconstruct the FLT via all tA reconstruction method guided by early-photon fluorescence yield tomography is proposed for time-domain fluorescence lifetime tomography (FLT) in this study. The method employs the early-arriving photons to reconstruct a fluorescence yield map, which is utilized as a priori information to reconstruct the FLT via all the photons along the temporal-point spread functions. Phantom experiments demonstrate that, compared with the method using all the photons for reconstruction of fluorescence yield and lifetime maps, the proposed method can achieve higher spatial resolution and reduced crosstalk between different targets without sacrificing the quantification accuracy of lifetime and contrast between heterogeneous targets..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071702 (2016)
Quantum Optics
Correction of the second-order degree of coherence measurement
Congcong Li, Xiangdong Chen, Shen Li, and Fangwen Sun
The measurement of the second-order degree of coherence [g(2)(τ)] is one of the important methods used to study the dynamical evolution of photon-matter interaction systems. Here, we use a nitrogen-vacancy center in a diamond to compare the measurement of g(2)(τ) with two methods. One is the prototype measurement proceThe measurement of the second-order degree of coherence [g ( 2 ) ( τ ) g ( 2 ) ( τ ) g ( 2 ) ( τ )
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 072701 (2016)
Materials
Sensitization of Sn2+ on Tb3+ luminescence for deep UV excitation in phosphate glasses
Lei Li, Yang Wang, Duojin Wang, Jian Qi... and Guorong Chen|Show fewer author(s)
Tb3+ and Sn2+ co-doped strontium phosphate glasses are prepared and their unique photoluminescence (PL) properties for deep UV excitation are investigated. With the co-doped Sn2+ ions, Tb3+ keeps the original PL behaviors under near UV excitation while its PL action for deep UV excitation is enhanced tremendously. PL eTb 3 + Sn 2 + Sn 2 + Tb 3 + Sn 2 + Tb 3 + Sn 2 + Tb 3 + Sn 2 + Tb 3 + τ Sn 2 + Tb 3 +
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 071601 (2016)
Thin Films
Design of Pd/B4C aperiodic multilayers for 8–12 nm region with flat reflectivity profile
Yiwen Wang, Qiushi Huang, Qiang Yi, Li Jiang... and Zhanshan Wang|Show fewer author(s)
The Pd/B4C multilayer is a promising candidate for high reflectance mirrors operating in the 8–12 nm extreme ultraviolet wavelength region. To extend the working bandwidth beyond the L-edge of silcon, we theoretically design broadband Pd/B4C multilayers. We discuss the influence of the desired reflectance of the plateaThe Pd / B 4 C Pd / B 4 C
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 073101 (2016)
Optics at Surfaces
Propagation properties of the terahertz waveguide using a metallic nanoslit narrower than skin depth
Jie Yang, Gongwei Lin, Yueping Niu, Yihong Qi... and Shangqing Gong|Show fewer author(s)
A terahertz (THz) waveguide using a metallic nanoslit whose width is much smaller than the skin depth is analytically investigated. By taking some important physical properties into account, we derive a simple, yet accurate, expression for the effective index. We also study the changes in modal field and the attenuatioA terahertz (THz) waveguide using a metallic nanoslit whose width is much smaller than the skin depth is analytically investigated. By taking some important physical properties into account, we derive a simple, yet accurate, expression for the effective index. We also study the changes in modal field and the attenuation coefficient in the whole THz region, and find some interesting physical properties. Finally, we verify that these theoretical analyses coincide with the rigorous numerical simulations. This research can be useful for various applications of THz waveguides made of metallic nanoslits..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 072401 (2016)
Detectors
External quantum efficiency-enhanced PtSi Schottky-barrier detector utilizing plasmonic ZnO:Al nanoparticles and subwavelength gratings
Bingxin Kang, Yi Cai, and Lingxue Wang
A infrared light trapping structure combining front subwavelength gratings and rear ZnO:Al nanoparticles for a PtSi Schottky-barrier detector over a 3–5 μm waveband is theoretically investigated. By selecting the proper plasmonic material and optimizing the parameters for the proposed structure, the absorption of the PA infrared light trapping structure combining front subwavelength gratings and rear ZnO:Al nanoparticles for a PtSi Schottky-barrier detector over a 3–5 μm waveband is theoretically investigated. By selecting the proper plasmonic material and optimizing the parameters for the proposed structure, the absorption of the PtSi layer is dramatically improved. The theoretical results show that this improvement eventually translates into an equivalent external quantum efficiency (EQE) enhancement of 2.46 times at 3–3.6 μm and 2.38 times at 3.6–5 μm compared to conventional structures. This improvement in the EQE mainly lies in the increase of light path lengths within the PtSi layer by the subwavelength grating diffraction and nanoparticle-scattering effects..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 070401 (2016)
X-Ray Optics
Vacuum-sealed miniature modulated x-ray source and the influence factors of x-ray intensity
Baoquan Li, and Huan Mou
The vacuum-sealed miniature modulated x-ray source (VMMXS) with a hot cathode is fabricated via the single-step brazing process in a vacuum furnace. An experiment following the VMMXS is implemented to present its performances, including the influence of grid electrode potential on x-ray intensities. The modulation typeThe vacuum-sealed miniature modulated x-ray source (VMMXS) with a hot cathode is fabricated via the single-step brazing process in a vacuum furnace. An experiment following the VMMXS is implemented to present its performances, including the influence of grid electrode potential on x-ray intensities. The modulation type of the grid electrode as a switch is proposed, and its feasibility is successfully demonstrated. It is noteworthy to discover a phenomenon for the first time, to the best of our knowledge, that the high repetition frequency grid pulse of the VMMXS has a significant effect on the x-ray intensity. The probable cause for this new finding is analyzed..
Chinese Optics Letters
- Publication Date: Jul. 10, 2016
- Vol. 14, Issue 7, 073401 (2016)
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