Contents
2020
Volume: 18 Issue 3
15 Article(s)

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Research Articles
Atomic and Molecular Optics
Diffraction and Gratings
Scalable Talbot effect of periodic array objects
Rui Yang, Zhenfa Xue, Zhiyong Shi, Liqiang Zhou, and Linwei Zhu
A type of scalable self-imaging capable of variable magnification or minification of periodic objects is demonstrated in the focal plane of a lens illuminated by a point source. The theory and the experimental results show that the self-imaging phenomenon can also be realized in the focal plane of a lens regardless of whether the distances satisfy the lens formula or not. The particular property of this scalable self-imaging effect is that the images in the focal plane can be controlled with different scaling factors only when the distances between the point source and the periodic object satisfy a certain condition. This discovery should open a new field of diffraction imaging and new application opportunities in precision measurement.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 030501 (2020)
Fiber Optics and Optical Communications
Resonator fiber optic gyros with light time-division input and multiplexing output in clockwise and counterclockwise directions
Zongfu Hu, Zhiguo Jiang, Jinfang Wang, and Su Mei
A resonator fiber optic gyro with the light time-division input and multiplexing output (TDM-RFOG) in the clockwise (CW) and counterclockwise (CCW) directions is proposed. The light time-division input in the CW and CCW directions can effectively suppress the backscattering induced noise. The TDM-RFOG is implemented with the 2 × 2 Mach–Zehnder interferometer (MZI) optical switch. The response time of the fiber ring resonator is analyzed, and it is demonstrated by experiments that light time-division input in the CW and CCW directions can reduce the backscattering induced noise. The suppression effectiveness of backscattering induced noise in the TDM-RFOG is determined by the extinction ratio of the optical switch, so a closed loop is designed to adjust the phase shift difference between the two arms of the MZI optical switch to control the extinction ratio. The method using two arms of the MZI optical switch with twin 90° polarization-axis rotated splices is proposed to make the extinction ratio along both slow and fast axes greater than ?70 dB.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 030601 (2020)
Tunable fiber-tip lens based on thermo-optic effect of amorphous silicon
Ping Li, Jing Liu, Peng Huang, Xingyu Zhang, Jinhui Shi, Libo Yuan, and Chunying Guan
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 030602 (2020)
Hollow-core photonic quasicrystal fiber with high birefringence and ultra-low nonlinearity
Zhuang Huo, Exian Liu, and Jianjun Liu
A hollow-core fiber based on photonic quasicrystal arrays is theoretically proposed for high-quality light wave propagation with high polarization maintaining performance and low nonlinearity. This fiber, called hollow-core photonic quasicrystal fiber (HC-PQF), can simultaneously realize a high birefringence that reaches 1.345 × 10-2 and a small nonlinear coefficient of 1.63 × 10-3 W-1·km-1 at a communication wavelength of 1.55 μm due to the air-filled core and unique quasiperiodic fiber structure. To further demonstrate the controllability of the nonlinear coefficient and the application of sensor and polarization-maintaining fiber, the nonlinearity is investigated by filling different inert gases in the fiber core while the birefringence keeps a high order of 10?2. In the wavelength range λ ∈ [1.53 μm, 1.57 μm], the dispersion is near zero and flattened. The HC-PQF is expected to be used for applications in optical communication, high power pulse transmission, polarization beam splitters, etc.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 030603 (2020)
Integrated Optics
Wavelength-mode pulse interleaver on the silicon photonics platform
Xinyi Wang, Gangqiang Zhou, Zhengtao Jin, Liangjun Lu, Guiling Wu, Linjie Zhou, and Jianping Chen
We report an 8-channel wavelength-mode optical pulse interleaver on a silicon photonic chip. Wavelength- and mode-division multiplexing techniques are combined to increase the repetition rate of the pulses without adding the complexity of a single dimension. The interleaver uses a cascaded Mach–Zehnder interferometer architecture as a wavelength-division (de)multiplexer, an asymmetric directional coupler as a mode (de)multiplexer, and various lengths of silicon waveguides as delay lines. A pulse sequence with a time interval of 125 ps is implemented with the repetition rate being eight times that of the initial one. The demonstrated wavelength-mode multiplexing approach opens a new route for the generation of high-speed optical pulses.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 031301 (2020)
Lasers and Laser Optics
Laser diode pumped high-energy single-frequency Er:YAG laser with hundreds of nanoseconds pulse duration | Editors' Pick
Shanghua Li, Qing Wang, Rui Song, Fangfang Hou, Mingwei Gao, and Chunqing Gao
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 031401 (2020)
Generation of 131 fs mode-locked pulses from 2.8 μm Er:ZBLAN fiber laser | Editors' Pick
Hongan Gu, Zhipeng Qin, Guoqiang Xie, Ting Hai, Peng Yuan, Jingui Ma, and Liejia Qian
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 031402 (2020)
Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser
Hengkang Zhang, Encai Ji, Bin Zhang, Yi Chen, Baoquan Yao, and Qiang Liu
The generation of mid-infrared pulsed lasers was achieved in a Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser system with the shortest pulse duration of 4.15 ns. With a pump pulse duration of 50 ns and pump power of 2.7 W, the gain-switched Cr2+:CdSe laser achieved over 10 times pulse narrowing, obtaining the maximum peak power of 5.7 kW. The optical-to-optical conversion efficiency was 3.7%, which could be further improved with better crystal surface polishing quality. The laser central wavelength was measured to be 2.65 μm with a bandwidth (FWHM) of 50 nm. In addition, the parameter optimization for suppressing the pulse tail was discussed, while the long cavity and high output transmissivity contributed to obtaining the single-peak pulses.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 031403 (2020)
Nanophotonics
Effects of different structural parameters and the medium environment on plasmonic lattice resonance formed by Ag nanospheres on SiO2 nanopillar arrays
Xiaodan Huang, Chaogang Lou, Hao Zhang, and Hua Yang
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 033601 (2020)
Optical Sensing, Measurements, and Metrology
Visual measurement of the microscopic temperature of porous graphene based on cholesteric liquid crystal microcapsules | On the Cover
Haoyan Jiang, Yaoyi Tang, Xiaohan Zeng, Ruiwen Xiao, Peng Lü, Lei Wang, and Yanqing Lu
Measuring the microscopic temperature of graphene is challenging. We used cholesteric liquid crystal microcapsules (CLCMs) as temperature sensors to detect the local temperature of three-dimensional porous graphene through quantitative visualization. Based on a CLCM (~20 μm in size), we determined the temperature variation in a small area with an accuracy of 0.1°C. By analyzing the color changes between two CLCMs, we demonstrated the temperature changes dynamically in a region with a diameter of approximately 110 μm. Furthermore, by comparing the color evolution among the three CLCMs, we visualized the anisotropic thermal properties in the micro-zone. This convenient and low-cost temperature measurement method is expected to further improve graphene-based devices.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 031201 (2020)
Other Areas of Optics
Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD
Ningning Liu, Mohan Wang, Zongyuan Tang, Lin Gao, Shuai Jing, Na Gao, Hongyu Xing, Xiangshen Meng, Zhenghong He, Jian Li, Minglei Cai, Xiaoyan Wang, and Wenjiang Ye
Image sticking in liquid crystal display (LCD) is related to the residual direct current (DC) voltage (RDCV) on the cell and the dynamic response of the liquid crystal materials. According to the capacitance change of the liquid crystal cell under the DC bias, the saturated RDCV (SRDCV) can be obtained. The response time can be obtained by testing the optical dynamic response of the liquid crystal cell, thereby evaluating the image sticking problem. Based on this, the image sticking of vertical aligned nematic (VAN) LCD (VAN-LCD) with different cell thicknesses (3.8 μm and 11.5 μm) and different concentrations of γ-Fe2O3 nanoparticles (0.017 wt.%, 0.034 wt.%, 0.051 wt.%, 0.068 wt.%, 0.136 wt.%, 0.204 wt.%, and 0.272 wt.%) was evaluated, and the effect of nano-doping was analyzed. It is found that the SRDCV and response time decrease firstly and then increase with the increase of the doping concentration of γ-Fe2O3 nanoparticles in the VAN cell. When the doping concentration is 0.034 wt.%, the γ-Fe2O3 nanoparticles can adsorb most of the free impurity ions in liquid crystal materials, resulting in 70% reduction in the SRDCV, 8.11% decrease in the decay time, and 15.49% reduction in the rise time. The results show that the doping of γ-Fe2O3 nanoparticles can effectively improve the image sticking of VAN-LCD and provide useful guidance for improving the display quality.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 033501 (2020)
Ultrafast Optics
Harmonically pump a femtosecond optical parametric oscillator to 1.13 GHz by a femtosecond 515 nm laser
Jiajun Song, Xianghao Meng, Zhaohua Wang, Xianzhi Wang, Wenlong Tian, Jiangfeng Zhu, Shaobo Fang, Hao Teng, and Zhiyi Wei
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 033201 (2020)
Vision, Color, and Visual Optics
The von Kries chromatic adaptation transform and its generalization
Cheng Gao, Zhifeng Wang, Yang Xu, Manuel Melgosa, Kaida Xiao, Michael H. Brill, and Changjun Li
Chinese Optics Letters
  • Publication Date: Mar. 10, 2020
  • Vol. 18, Issue 3, 033301 (2020)

About the Cover

Visual system for microscopic temperature measurement of porous graphene based on CLCMs. The inset shows the distribution of CLCMs on the porous graphene.