Journals >Chinese Optics Letters
Contents
2016
Volume: 14 Issue 10
19 Article(s)
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Geometric Optics
Design of a freeform, dual fields-of-view, dual focal lengths, off-axis three-mirror imaging system with a point-by-point construction-iteration process
Tong Yang, Jun Zhu, and Guofan Jin
In this Letter, we propose a novel configuration and design method of freeform, dual fields-of-view (FOVs), dual focal lengths, off-axis three-mirror zoom imaging systems. The switch of the two zooms is achieved by rotating a single mirror element. The design of a freeform, dual focal lengths zoom system is realized byIn this Letter, we propose a novel configuration and design method of freeform, dual fields-of-view (FOVs), dual focal lengths, off-axis three-mirror zoom imaging systems. The switch of the two zooms is achieved by rotating a single mirror element. The design of a freeform, dual focal lengths zoom system is realized by a point-by-point design approach for the first time to our knowledge. This method enables the direct design of freeform surfaces from initial planes using given system specifications and configuration, and the designed system can be taken as a good starting point for further optimization. A freeform, dual FOVs, dual focal lengths, off-axis three-mirror zoom system is demonstrated. The F-numbers of the two zooms are 2 and 2.4. The dual FOVs are 3 ° × 3 ° 2.5 ° × 2.5 °
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100801 (2016)
Holography
Generation of edge-preserved noise-added phase-only hologram
P. W. M. Tsang, Y. T. Chow, and T.-C. Poon
Noise addition is a simple but effective method for generating a phase-only hologram (POH) of an object. Briefly, the intensity image of an object is added with random phase noise and converted into a digital Fresnel hologram. Subsequently, the phase component of the hologram is retained as the POH. Although the methodNoise addition is a simple but effective method for generating a phase-only hologram (POH) of an object. Briefly, the intensity image of an object is added with random phase noise and converted into a digital Fresnel hologram. Subsequently, the phase component of the hologram is retained as the POH. Although the method is fast and the visual quality of the reconstructed image is acceptable, the edges and lines patterns are heavily fragmented. In this Letter, we propose a method to overcome this problem. An experimental evaluation based on numerical and optical reconstructions reveals that a hologram generated by our proposed method is capable of preserving line patterns with favorable quality..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100901 (2016)
Lasers and Laser Optics
Study on the sensitivity of optical cavity length to light power fluctuation
Wen Qi, Yanyi Jiang, Xueyan Li, Li Jin... and Longsheng Ma|Show fewer author(s)
The length stability of optical cavities is vital in ultra-stable, cavity-stabilized laser systems. Using finite element analysis, we study the length deviation of optical cavities due to thermal expansion and thermo-refractive effects when the incident light power is changed. The simulated fractional length sensitivitThe length stability of optical cavities is vital in ultra-stable, cavity-stabilized laser systems. Using finite element analysis, we study the length deviation of optical cavities due to thermal expansion and thermo-refractive effects when the incident light power is changed. The simulated fractional length sensitivity of a 7.75-cm-long football cavity to the power fluctuation of incident light is 5 × 10 14 / μW
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 101401 (2016)
Characterization of electromagnetic pulses via arrays on ShenGuang-III laser facility laser
Ming Yang, Tingshuai Li, Chuanke Wang, Jinwen Yang... and Yongkun Ding|Show fewer author(s)
Intensive electromagnetic pulses (EMPs) can be generated from interaction of the ultra-intense lasers and solid targets in inertial confinement fusion (ICF), which will detrimentally affect the data acquisition from some electric components. A diagnostic system for EMP measurement inside and outside the ShenGuang-III fIntensive electromagnetic pulses (EMPs) can be generated from interaction of the ultra-intense lasers and solid targets in inertial confinement fusion (ICF), which will detrimentally affect the data acquisition from some electric components. A diagnostic system for EMP measurement inside and outside the ShenGuang-III facility is designed and fabricated in this study. The experimental results indicate that the peak magnitude of EMP reaches up to 3210.7 kV/m and 6.02 T. The received signals depend most on the antenna and target types. The half-hohlraum generates a more intensive EMP radiation than that from the other targets, and the large planar and medium discone capture much stronger signals than the other antennas. In addition, the mechanisms of EMP generation from different targets are discussed. The resulting conclusion are expected to provide the experimental basis for further EMP shielding design..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 101402 (2016)
Diffraction and Gratings
Low-cost method of fabricating large-aperture, high efficiency, Fresnel diffractive membrane optic using a modified moiré technique
Jian Zhang, Mengjuan Li, Ganghua Yin, Jianchao Jiao... and Shaojun Fu|Show fewer author(s)
To reduce the cost and achieve high diffraction efficiency, a modified moiré technique for fabricating a large-aperture multi-level Fresnel membrane optic by a novel design of alignment marks is proposed. The modified moiré fringes vary more sensitively with the actual misalignment. Hence, the alignment accurTo reduce the cost and achieve high diffraction efficiency, a modified moiré technique for fabricating a large-aperture multi-level Fresnel membrane optic by a novel design of alignment marks is proposed. The modified moiré fringes vary more sensitively with the actual misalignment. Hence, the alignment accuracy is significantly improved. Using the proposed method, a 20 μm thick, four-level Fresnel diffractive polyimide membrane optic with a 200 mm diameter is made, which exhibits over 62% diffraction efficiency into the + 1
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100501 (2016)
Optical Devices
Indoor multi-robot intelligent coordination based on omni-directional visible light communication
Zhitong Huang, Cao Yan, Ke Wu, and Yuefeng Ji
Multi-robot coordination (MRC) is a key challenge for complex artificial intelligence systems, and conventional wireless-communication-based MRC mechanisms that cannot be deployed in radio-frequency-limited environments. In this Letter, we present a promising solution that utilizes indoor omni-directional visible lightMulti-robot coordination (MRC) is a key challenge for complex artificial intelligence systems, and conventional wireless-communication-based MRC mechanisms that cannot be deployed in radio-frequency-limited environments. In this Letter, we present a promising solution that utilizes indoor omni-directional visible light communication (VLC) technology to realize efficient multi-robot intelligent coordination (MRIC). The specific design is presented along with the implemental details of a practical MRIC experimental platform. The experimental results show that a 50 Mb / s < 10 6
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 102301 (2016)
Charge distribution into illuminated dye-doped surface stabilized ferroelectric liquid crystal cell
Marek Sutkowski, and Wiktor Piecek
Surface stabilized (anti) ferroelectric liquid crystal cells can be used as an optically addressed media for optical data processing. The structure of the cell has to contain a photo sensible agent, i.e., an absorbing dye-doped orienting layer. The all-optical generation of the diffractive grating can be done due to thSurface stabilized (anti) ferroelectric liquid crystal cells can be used as an optically addressed media for optical data processing. The structure of the cell has to contain a photo sensible agent, i.e., an absorbing dye-doped orienting layer. The all-optical generation of the diffractive grating can be done due to the switching parameters of the smectic slab within cells with a sensitive layer. This Letter considers a study of the optically induced charge generation into the dye-doped layer, and the explanation of the phenomena of the selective molecular director reorientation, while cell driving what leads to the induction of phase grating..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 102302 (2016)
Design of a concise and dual-band tunable metamaterial absorber
Zongzhe Li, Chunya Luo, Gang Yao, Jin Yue... and Furi Ling|Show fewer author(s)
We theoretically present a concise and tunable dual-band metamaterial absorber composed of a typical metal-dielectric-metal structure in the terahertz regime. The dual-band absorption originates from two different resonance modes induced in one square ring, which is different from the common dual-band absorber composedWe theoretically present a concise and tunable dual-band metamaterial absorber composed of a typical metal-dielectric-metal structure in the terahertz regime. The dual-band absorption originates from two different resonance modes induced in one square ring, which is different from the common dual-band absorber composed of a super unit with several different-sized structures. The proposed absorber can realize dynamic tunability through changing the permittivity of the dielectric layer by applying different temperatures. Other good performances, such as a wide incident angle and polarization insensitivity, are also available for the proposed absorber. Such a metamaterial absorber is a promising candidate for terahertz imaging and detection..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 102303 (2016)
Coverage of coherent output states in parallel-coupled dual-racetrack microresonators
Wei Jiang, and Yating Zhou
Parallel-coupled dual-racetrack silicon microresonators can potentially be used for quadrature amplitude modulation. We analyze the evolution of the coverage of coherent output states of devices with varying device parameters. As the coupling constant increases, the coverage of coherent states initially improves then dParallel-coupled dual-racetrack silicon microresonators can potentially be used for quadrature amplitude modulation. We analyze the evolution of the coverage of coherent output states of devices with varying device parameters. As the coupling constant increases, the coverage of coherent states initially improves then degrades, which is unexpected based on a prior preference for overcoupling. Increasing the quality factor generally improves the coverage. The influence of the refractive index modulation is found to saturate after reaching a certain level. Analytic formulas are developed to provide insight into the coverage evolution. These results are fairly robust against a small asymmetry of device parameters..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 102304 (2016)
Fiber Optics and Optical Communications
Carrier phase estimation scheme for faster-than-Nyquist optical coherent communication systems
Chengcheng Li, Dongwei Pan, Yiqiao Feng, Jiachuan Lin... and Xiaoguang Zhang|Show fewer author(s)
We propose a modified-Viterbi and Viterbi phase estimation (VVPE) carrier phase recovery scheme that shows an effective capability of reducing the frequent and accumulated cycle slips induced by inter-symbol interference (ISI) in a faster-than-Nyquist (FTN) optical coherent communications system. In a 28-Gbaud FTN polaWe propose a modified-Viterbi and Viterbi phase estimation (VVPE) carrier phase recovery scheme that shows an effective capability of reducing the frequent and accumulated cycle slips induced by inter-symbol interference (ISI) in a faster-than-Nyquist (FTN) optical coherent communications system. In a 28-Gbaud FTN polarization-division multiplexed quadrature phase-shift keying optical communication system, the comparison of the proposed modified-VVPE scheme and the conventional VVPE scheme is carried out. It is proved that the proposed modified-VVPE scheme can effectively overcome the challenge of ISI induced error carrier phase estimation, which leads to a better bit error ratio performance..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100601 (2016)
Raman scattering enhancement characteristic of NbCl5- and Nb2O5-doped silica fibers
Pengxiang Yang, Zhenyi Chen, Na Chen, Shupeng Liu... and Tingyun Wang|Show fewer author(s)
Two kinds of Nb-doped silica fibers, an NbCl5-doped fiber and an Nb2O5-doped fiber, are fabricated and characterized in this Letter. First, the refractive index profiles of both fibers are obtained, and then their Raman spectra are measured with 785 nm exciting light. The Nb-doped fibers’ Raman spectra are compared witTwo kinds of Nb-doped silica fibers, an NbCl 5 Nb 2 O 5 GeO 2 Nb 2 O 5
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100602 (2016)
All-fiber electro-optic modulator based on D-shaped twin-core fiber
Jianshuai Wang, Li Pei, Sijun Weng, Liangying Wu... and Jing Li|Show fewer author(s)
In a D-shaped twin-core fiber (DTCF), the central core is insensitive to the variation of the external environment, while the other core is highly sensitive. As an electro-optic polymer coated on a DTCF, the coupling between the two cores varies with voltages applied to the polymer. Based on this, a superior all-fiber In a D-shaped twin-core fiber (DTCF), the central core is insensitive to the variation of the external environment, while the other core is highly sensitive. As an electro-optic polymer coated on a DTCF, the coupling between the two cores varies with voltages applied to the polymer. Based on this, a superior all-fiber modulator is proposed that bears little coupling loss, prohibits mode mismatch, and provides a more stable working circumstance. A half-wave driving voltage (V π
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100603 (2016)
Crosstalk-aware RCSA for spatial division multiplexing enabled elastic optical networks with multi-core fibers
Ruijie Zhu, Yongli Zhao, Hui Yang, Haoran Chen... and Jason P. Jue|Show fewer author(s)
In this Letter, we propose two crosstalk-aware routing, core, and spectrum assignment (CA-RCSA) algorithms for spatial division multiplexing enabled elastic optical networks (SDM-EONs) with multi-core fibers. First, the RCSA problem is modeled, and then a metric, i.e., CA spectrum compactness (CASC), is designed to meaIn this Letter, we propose two crosstalk-aware routing, core, and spectrum assignment (CA-RCSA) algorithms for spatial division multiplexing enabled elastic optical networks (SDM-EONs) with multi-core fibers. First, the RCSA problem is modeled, and then a metric, i.e., CA spectrum compactness (CASC), is designed to measure the spectrum status in SDM-EONs. Based on CASC, we propose two CA-RCSA algorithms, the first-fit (FF) CASC algorithm and the random-fit (RF) CASC algorithm. Simulation results show that our proposed algorithms can achieve better performance than the baseline algorithm in terms of blocking probability and spectrum utilization, with FF-CASC providing the best performance..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100604 (2016)
Imaging Systems
Practical millimeter-wave holographic imaging system with good robustness
Yukun Zhu, Minghui Yang, Liang Wu, Yun Sun, and Xiaowei Sun
A practical millimeter-wave (MMW) holographic imaging system with good robustness is developed for the detection of concealed weapons at security checkpoints, especially at the airport. The system is used to scan the passenger and detect any weapons hidden in their clothes. To reconstruct the three dimensional image, aA practical millimeter-wave (MMW) holographic imaging system with good robustness is developed for the detection of concealed weapons at security checkpoints, especially at the airport. The system is used to scan the passenger and detect any weapons hidden in their clothes. To reconstruct the three dimensional image, a holographic MMW imaging algorithm based on aperture synthesis and backscattering is presented. The system is active and works at 28–33 GHz. As a practical imaging system, the robustness is analyzed in detail in terms of the peak signal-to-noise ratio..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 101101 (2016)
Optical readout method based on time-discrete modulation for micro-cantilever array sensing
Xuhong Chu, Liquan Dong, Yuejin Zhao, Xiaomei Yu, and Yun Feng
Noise and the resonance characteristics of the focal plane array (FPA) are the most important factors that affect the performance of the optical readout infrared (IR) FPA imaging system. This Letter presents a time-discrete modulation technology that eliminates the background and restrain noise, which effectively improNoise and the resonance characteristics of the focal plane array (FPA) are the most important factors that affect the performance of the optical readout infrared (IR) FPA imaging system. This Letter presents a time-discrete modulation technology that eliminates the background and restrain noise, which effectively improves the image quality of the optical readout IR FPA imaging system. The comparative experiments show that this technology can reduce the noise equivalent temperature difference greatly and make the images sharper. Moreover, when the imaging system is influenced by the environment vibration, the images obtained from the imaging system with time-discrete modulation restore twice as fast as without time-discrete modulation..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 101102 (2016)
Power efficiency of time-stretch imaging system by using parallel interleaving detection
Mengxuan Lv, Bo Dai, Songchao Yin, Dawei Zhang, and Xu Wang
A 38.88 MHz time-stretch line-scan imaging system with parallel interleaving detection is experimentally demonstrated. Since only half-chromatic dispersion is used to stretch optical pulses for wavelength-to-time mapping, the power efficiency is significantly improved by 6.5 dB. Furthermore, the theoretical analysis inA 38.88 MHz time-stretch line-scan imaging system with parallel interleaving detection is experimentally demonstrated. Since only half-chromatic dispersion is used to stretch optical pulses for wavelength-to-time mapping, the power efficiency is significantly improved by 6.5 dB. Furthermore, the theoretical analysis indicates that the power loss can be efficiently reduced for scan rates less than 100 MHz. In addition, a mathematical model for signal-to-noise evaluation is derived, including amplified spontaneous emission noise in the power compensation. Thanks to the improvement of the power efficiency by using parallel interleaving detection, the signal quality is enhanced..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 101103 (2016)
Integrated Optics
Analysis of an integrated tunable spectrometer for the short to mid-infrared range based on a ring resonator
Jie Huang, Junbo Yang, Hailiang Zhang, Hongqing Wang... and Shengli Chang|Show fewer author(s)
An integrated, tunable spectrometer based on a silicon-on-sapphire platform is designed at wavelengths of 2.29–2.35 μm. Its pivotal component is a 4.7 μm-radius ring resonator on a graphene monolayer. Its full width at half-maximum and free spectral range are ～1.5 and ～45 nm, respectively, as found through a numerical An integrated, tunable spectrometer based on a silicon-on-sapphire platform is designed at wavelengths of 2.29–2.35 μm. Its pivotal component is a 4.7 μm-radius ring resonator on a graphene monolayer. Its full width at half-maximum and free spectral range are ～ 1.5 ～ 45 nm
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 101301 (2016)
Atmospheric and Oceanic Optics
First light on an adaptive optics system using a non-modulation pyramid wavefront sensor for a 1.8 m telescope
Shengqian Wang, Kai Wei, Wenjia Zheng, and Changhui Rao
Our adaptive optics system based on a non-modulation pyramid wavefront sensor is integrated into a 1.8 m astronomical telescope installed at the Yunnan Observatory in LiJiang, and the first light with high-resolution imaging of an astronomical star is successfully achieved. In this Letter, the structure and performanceOur adaptive optics system based on a non-modulation pyramid wavefront sensor is integrated into a 1.8 m astronomical telescope installed at the Yunnan Observatory in LiJiang, and the first light with high-resolution imaging of an astronomical star is successfully achieved. In this Letter, the structure and performance of this system are introduced briefly, and then the observation results of star imaging are reported to show that the angular resolution of an adaptive optics system using a non-modulation pyramid wavefront sensor can approach the diffraction limit quality of a 1.8 m telescope..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100101 (2016)
Prototype of solar ground layer adaptive optics at the 1 m New Vacuum Solar Telescope
Lin Kong, Lanqiang Zhang, Lei Zhu, Hua Bao... and Changhui Rao|Show fewer author(s)
A prototype of a solar ground-layer adaptive optics (GLAO) system, which consists of a multi-direction correlating Shack–Hartmann wavefront sensor with 30 effective subapertures and about a 1 arcmin field of view (FoV) in each subaperture, a deformable mirror with 151 actuators conjugated to the telescope entrance pupiA prototype of a solar ground-layer adaptive optics (GLAO) system, which consists of a multi-direction correlating Shack–Hartmann wavefront sensor with 30 effective subapertures and about a 1 arcmin field of view (FoV) in each subaperture, a deformable mirror with 151 actuators conjugated to the telescope entrance pupil, and a custom-built real-time controller based on field-programmable gate array and multi-core digital signal processor (DSP), is implemented at the 1 m New Vacuum Solar Telescope at Fuxian Solar Observatory and saw its first light on January 12th, 2016. The on-sky observational results show that the solar image is apparently improved in the whole FoV over 1 arcmin with the GLAO correction..
Chinese Optics Letters
- Publication Date: Oct. 10, 2016
- Vol. 14, Issue 10, 100102 (2016)
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