Du Zhengting   Zhang Tianqi   Xie Zhenda   Ning Jian   Lv Xinjie   Xu Jinlong   Zhu Shining  

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Due to the composition-dependent properties of two-dimensional (2D) transition metal dichalcogenides (TMDs), alloying of existing dissimilar TMDs architecture is a novel and controllable route to tailor crystal structure with superior optical and optoelectronic properties. Here, we reported the hexagonal-phase WSe1.4Te0.6 alloy can enable great promise for enhanced saturable absorption response exceeding the parent component WSe2 and WTe2, with larger modulation depth and lower saturable intensity. These advantages allowed the 1070 nm passively Q-switched lasers based on WSe1.4Te0.6 more efficient, with narrowing pulse duration narrowed to 45%, slope efficiency increased by 232%. Our findings highlighted the appropriate alloying of TMDs as an effective strategy for development of saturable absorbers.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Zhou Tianhua   Ma Jian   Lu Tingting   Hu Guyu   Fan Tingwei   Zhu Xiaopeng   Zhu Xiaolei   Chen Weibiao  

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One fast simulation method using Markov chains was introduced to simulate angular, energy and temporal characteristics of pulsed laser beam propagation underwater. Angular dispersion of photons with different number of collisions was calculated based on scattering function and state transition matrix of Markov chains. Temporal distribution and energy on the receiving plane were obtained respectively by use of novel successive layering model and receiving ratio. The validity of this method was verified by comparing with Monto Carlo ray tracing (MCRT) method. The simulation results were close to those obtained by MCRT with less time consuming and smoother curves.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Chang Junwei   Zhu Ruihan   Xi Tingting   Xu Mengning   Wang Di   Zhang Lanzhi   Li Dongwei   Hao Zuoqiang  

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We show the intensity control of filamentation in fused silica by temporally shaping the femtosecond laser pulse. The arbitrary control of filamentation intensity has been obtained by the feedback control based on the genetic algorithm, and the peak intensity of filament has changed from about 670 to around 2100 (CCD counts). This modulation is qualitative agreement with the simulation results. It is shown that the control of the intensity is realized by modulating the peak power of the shaped pulse.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Fan Xiaojun   JIANG J.F.   Zhang Xuezhi   Liu Kun   Wang Shuang   Liu Tiegen  

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Wake fiber Bragg grating (WFBG) is an ideal quasi-distributed optical fiber sensor. Special attention should be paid to the spectrum and sensing performance of WFBG at extreme temperature due to its poor reflection intensity. In this paper, the temperature characteristics of WFBG from -252.75℃ to 200.94℃ are experimentally investigated. Five WFBGs with reflectivity from ~0.25% to ~10% are used in the experiments. The reflectivity variations and wavelength shifts at different temperatures are studied. Experimental results show that the WFBG can survive and work at extreme temperature, but the performance is affected significantly. The reflectivity is affected significantly by both cryogenic temperature and high temperature. The temperature responses of Bragg wavelengths in the wide temperature range are also obtained.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Gu Zhiyuan   Wang Xianghui   Wang Jianxin   Fan Fei   Chang Shengjiang  

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Subtractive imaging is used to suppress the axial sidelobes and improve the axial resolution of 4pi microscopy with higher-order radially polarized (RP) Laguerre-Gaussian (LG) beam. A solid-shaped point spread function (PSF) and a doughnut-shaped PSF with a dark spot along the optical axis are generated by tightly focusing higher-order RP-LG beam and modulated circularly polarized beam, respectively. By subtracting the two images obtained with those two different PSFs, the axial sidelobes of the subtracted PSF are reduced from 37% to about 10% of the main lobe and the axial resolution is increased from 0.21λ to 0.15λ.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Zhang Zhike   Li Jinye   Zhao Zeping   Liu Jianguo   Wang Xingjun  

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We demonstrate a package-level passive equalization technology in which the wire bonding-induced resonance effect is used to compensate for the limited gain strength within the Nyquist frequency. The corresponding gain strength under various inductance and capacitance combinations could be quantitatively determined using a numerical simulation. With the increase in the Nyquist frequency, the capacitance shows a greater effect on the gain strength than the inductance. Therefore, the parasitic capacitance should be decreased to realize the desired gain strength at a higher Nyquist frequency. With this equalization technology, a gain strength of 5.8 dB is obtained at 22 GHz, which can compensate for the limited bandwidth for the 112 Gbps PAM4 signal. The experimental results show that 112Gb/s/λ PAM4 transmission based on a directly modulated laser module can be realized with a bit error rate of 1 × 10−3 at a received optical power of 3 dBm.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Xin Tian   Hao Li   Liu Le   Wang Meng   Xi Xiaoming   Wang Zefeng  

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We report here an ultra-broadband LP01-LP11 mode converter operating at 1 μm based on a long period fiber grating (LPFG) fabricated in a conventional two-mode fiber (TMF) by line-focused CO2 laser. The measured 3 dB-bandwidth is about 240 nm, which is the broadest bandwidth for such fiber mode converters. The maximum conversion efficiency between LP01 and LP11 modes is > 99% over the range of 1000 nm to 1085 nm, almost covering the whole emission band of Yb3+, which is useful for further power scaling of high power fiber lasers operation at 1μm band.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Zhang Zhenzhen   郭 骋   Cui Liang   Zhang Yichi   Du Cheng   Li Xiaoying  

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Using the few mode erbium doped fiber (FM-EDF) with a simple two-layer erbium doped structure, we demonstrate an all-fiber few mode erbium doped fiber amplifier. The gain equalization among the six spatial modes supported by the FM-EDF is achieved when only the pump in fundamental mode (LP01) is applied. When the signals in six spatial modes are simultaneously amplified, the average modal gain is about 15 dB, and differential modal gain is about 2.5 dB for signal at 1550 nm.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Lin Tianying   Ang Liu   Xiaopei Zhang   Li He   Liping Wang   Hailong Han   Ze Chen   Xiaoping Liu   Haibin Lv  

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Inspired by recent rapid deep learning development, we present a convolutional-neural-network-based algorithm to predict OAM mode purity in optical fibers using far field patterns. It is found that this image-processing-based technique has an excellent ability in predicting the OAM mode purity, potentially eliminating the need of using bulk optic devices to project light into different polarization states in traditional methods. The excellent performance of our algorithm can be characterized by a prediction accuracy of 99.8% and correlation coefficient of 0.99994. Furthermore, the robustness of this technique against different sizes of testing sets and different phases between different fiber modes are also verified. Hence, such a technique has a great potential in simplifying the measuring process of OAM purity.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Cheng Haijuan   Dong Miao   Tan Qinwen   Meng Linghai   Cai Yi   Jiang Jie   Yang Weisheng   Zhong Haizheng   Wang Lingxue  

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A gradient-index Reuleaux-triangle-shaped hole array was fabricated on germanium by nanoimprint lithography and inductively coupled plasma processing as a broadband mid-IR antireflective surface. The interaction between the { 111} planes of cubic crystalline Ge and a circular mold successfully produced an orderly and periodically distributed Reuleaux-triangle-shaped hole array. As a result, the average transmittance increased 15.67% over the waveband at 3–12 μm and maintain stable at the incidence angle of up to 60°. The vertices of the Reuleaux triangle showed local enhancement of the electric field intensities due to interference of the incident and reflected radiation fields. It was also found that nonuniform hole depths acted to modulate the transmittance over the 3–12 μm waveband.

       PDF全文 (下载：5)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Shen Yijiang   Peng Fei   Huang Xiaoyan   Zhang Zhenrong  

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We develop a source mask co-optimization framework incorporating the minimization of edge placement error (EPE) and process variability band (PV Band) into the cost function to compensate simultaneously for the image distortion and the increasingly pronounced lithographic process conditions. Explicit differentiable functions of the EPE and the PV Band are presented and adaptive gradient methods are applied to break symmetry to escape suboptimial local minima. Dependence on the initial mask conditions is also investigated. Simulation results demonstrate the efficacy of the proposed SMO approach in pattern fidelity improvement, process robustness enhancement and almost unaffected performance with random initial masks.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Huang Xuan   Yang Fang   Song Jian  

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In this paper, the current research of underwater optical wireless communication (UWOC) network is reviewed first. Hybrid laser diode (LD) and light-emitting diode (LED) based UWOC system is then proposed and investigated, in which a hybrid cluster-based networking with mobility restricted nodes is utilized to improve both the life cycle and throughput of UWOC network. Moreover, the LEDs are utilized for the coarse alignment while the LDs are used for high precision positioning to reduce the difficulty of optical alignment. Finally, challenges and trends for UWOC are pointed out to provide some insight for the potential future work of researchers.

       PDF全文 (下载：3)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Zheng Qiaoyu   Li Yang   Wu Wenjuan   Zou Jun   Yang Bobo   Shi Mingming  

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The phosphor in glass (PiG) employing Ce: YAG-doped boro-bismuthate glass via low-temperature co-sintering technology was successfully prepared, using Bi2O3- B2O3-ZnO glass as base material. The photoluminescence (PL) of PiG co-sintered at times ranging from 20 min to 60 min for 700 °C was investigated. As a result, the relative PL intensity of PiG under a reducing atmosphere of CO showed significantly enhanced about 7-14 times than that under air atmosphere sintering for 20-50 min. The photoluminescence intensity decreased gradually with the co-sintering time, which may be due to the corrosion of the YAG lattice structure.

       PDF全文 (下载：1)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Xu Jianxun   Jiang Ming   Chen Yufa  

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High-rate techniques, such as optical orthogonal frequency division multiplexing (O-OFDM) and color shift keying (CSK), have been proposed for visible light communication (VLC). To fully exploit their advantages, in this letter we design a modulation scheme called rotated polarity-modulation (RPM) aided complex CSK (CCSK) for O-OFDM based VLC systems, and derive its theoretical bit error rate (BER) and an optimal scaling factor. Analytical and simulation results show that in comparison to the existing schemes, the new RPM-CCSK-OFDM system offers an improved link performance and data rate under a modest complexity. It can also be applied to VLC systems equipped with different types of LED devices, thus enabling flexible deployments.

       PDF全文 (下载：2)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Zhang Lu   Zhang Wendong   Zhang Shougang   Yan Shu-Bin  

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Vapor cell provides a well-controlled and stable inner atmosphere for atomic sensors, such as atomic gyroscopes, atomic magnetometers and atomic clocks and its hermeticity affects the stability and aging of atomic sensors. We present the micro-fabrication of a MEMS wafer-level hermit vapor cell based on deep reactive ion etching and vacuum anodic-bonding technology. Anodic bonding process with the voltage increasing in steps of 200 V, had a critical influence on vapor cell hermeticity. Further, the silicon-glass bonding surface was experimentally investigated by SEM, which illustrated that there were no visual cracks and defects in the bonding surface. The leak rate was measured using helium leak detector. The result shows that the vapor cells with different optical cavity lengths comply with the MIL-STD-883E standard (5×10-8 mbar.l/s). Moreover, D2 absorption spectroscopy was characterized via optical-absorption. The bonding strength was determined to be 13 MPa, which further verified the quality of the vapor cells.

       PDF全文 (下载：5)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Li Yangliang   Shen Chao   Shao Li   Zhang Yujun  

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Particle ejection is an important process during laser-induced exit surface damage in fused silica. Huge quantity of ejected particles, large ejection velocity and long ejection duration make this phenomenon difficult to be directly observed. An in situ two-frame shadowgraphy system combining with a digital particle recognition algorithm was employed to capture the transient ejecting images and obtain the particle parameters. The experimental system is based on the principle of polarization splitting and can capture two images at each damage event. By combing multiple similar damage events at different time delays, the timeline of ejecting evolution can be obtained. Particle recognition is achieved by an adaptively regularized kernel-based fuzzy C-means algorithm based on grey wolf optimizer. This algorithm overcomes the shortcoming of adaptively regularized kernel-based fuzzy C-means algorithm easily falling into local optimum and can resist strong image noises including diffraction pattern, laser speckle and motion artifact. This system is able to capture particles ejected after 600 ns with a time resolution of 6 ns and spatial resolution better than 5 μm under the particle recognition accuracy of 100%.

       PDF全文 (下载：1)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

He Qiang   Wang fan   Lin Zhiquan   Shao Chongyun   Wang Meng   Wang Shikai   Yu Chunlei   Hu Lili  

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Using a heavily erbium doped aluminosilicate fiber prepared by sol-gel method combined with high temperature sintering, the temperature dependence of spectrum around 1.55nm band and single mode fiber laser properties were investigated respectively. The absorption cross section increases 29.2% at ~1558nm with temperature increasing from 20℃ to 140℃, while the emission cross section increase 4.3% slight. In addition, the laser slope of the EDF at 1558nm decreases 4.4% from 10.8% to 6.4 with the temperature increasing from 18℃ to 440℃. Meanwhile, an experiment lasting 3 hours proves that the fiber laser has excellent stability below 440℃.

       PDF全文 (下载：2)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Qian Jinwang   Zheng Zhennan   Lei Mingzheng   Song Chunqi   huang shanguo   Gao Xinlu  

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A complex-coefficient microwave photonic filter with continuous tunability is proposed and demonstrated, which has a compact structure and stable performance without splitting the optical path and tuning the polarization state. By only controlling the DC biases of the modulator, the amplitudes and the phases of the filter taps can both be tuned. The phase difference between the two filter taps covers a full 360° range from 10 GHz to 32 GHz. Frequency responses of the proposed filter are measured within 10-20 GHz with different center frequency.

       PDF全文 (下载：1)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Srivastava Vibhu   Mishra Prateek   Sunny Sunny  

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The impulse response for a phase-change material Ge2Sb2Te5 (GST) based photodetector integrated with SOI waveguide is simulated using finite difference time domain. The current is calculated by solving the drift-diffusion model for a short pulse (~10 fs) excitation for both of the stable phases. FWHM values of less than 1 ps are found in the investigation. The crystalline-GST has higher 3dB BW than the amorphous-GST at 1550 nm wavelength with responsivities of 21 A/W and 18.5 A/W, respectively, for 150nm thick GST layer biased at 2 V. Broad spectrum can be utilized by tuning the device using phase-change property of material in the near infra-red region.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第10期 pp.10      

Wang Fang   Deng Xuewei   Liquan Wang   Li Fuquan   Han Wei   Zhou Wei   Huang Xiaoxia   Huaiwen Guo   Qihua Zhu  

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Fifth harmonic generation (5th HG) of Nd: glass laser is an effective way to acquire high-energy coherent deep-ultraviolet radiation near 200 nm. In this work, cascade generation of the fifth harmonic of Nd: glass laser in a 5mm ADP crystal was investigated, and maximum conversion efficiency of 14% and large angular acceptance of 45 mrad were demonstrated at non-critical phase-matching temperature of -75.1℃. However, as the results reveal, the temperature sensitivity and nonlinear absorption would hinder its high-energy application. As for it, based on the complementary relationship of angular and temperature in the phase-matching condition, an upgraded focusing 5thHG design coupled with cylindrical temperature distribution scheme was proposed. By this upgraded focusing design, more than the improving of the conversion efficiency, the output 5ω near-field intensity distribution turns to be insensitive to the temperature gradient. Potentially, this idea can be applied for many other frequency conversion schemes such as high-repetition frequency lasers which have similar temperature gradient problems.

       PDF全文 (下载：1)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

kang minqiang   Deng Ying   Yan xiongwei   Zeng Xiaoming   Guo Yangwu   Yao Jiyong   Zeng Fa   ZHENG Jiangang   Zhou Kainan   Qu Chongbing   Su Jingqin   Zhu Qihua  

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We report an efficient mid-infrared extracavity optical parametric oscillator (OPO) based on the nonlinear crystal BaGa4Se7 pumped by a diode-side-pumped Q-switched Nd:YAG laser. The maximum pulse energy of 1.03 mJ at 4.25 μm is obtained with the repetition rate of 10 Hz and pulse width of 12.6 ns when the pump energy was 13.5 mJ, corresponding to an optical-to-optical conversion efficiency of 7.6% from 1.064μm to 4.25 μm. And the idler wave slope convertion efficency was 12%. To our best knowledge, it is the highest reported conversion efficiency for the compact BaGa4Se7 OPO driven by the Nd:YAG laser.

       PDF全文 (下载：1)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Wang Zhou-Xiang   Xie Yu-Chen   Huang Shuang-Yin   Zhou Han   Liu Rui   Liu Zhi-Feng   Wang Min   Qi Wen-Rong   Tian Qian-Qian   Kong Ling-Jun   Tu Chenghou   Li Yongnan   Wang Huitian  

      摘要 + 此论文可免费阅读 (可能需要登录)

In free-space or in optical fibers, the orbital angular momentum (OAM) multiplexing for information transmission has been greatly developed. The light sources used were well coherent communication bands and the fibers used were customized. Here we use an 810-nm femtosecond laser to generate optical vortices carrying OAM, and then feed them into two kinds of commercial step-index few-mode fibers to explore the transmission characteristics of OAM modes. We also propose a method without multiple-input multiple-output digital signal processing to identify the input OAMs. It is of great guiding significance for high-dimensional quantum information experiments via the OAMs as a degree of freedom, using the light generated by the spontaneous parametric down-conversion as source and the commercial fibers for information transmission.

       PDF全文 (下载：12)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Gu Fuxing   ubaid saima   Liao Feng   Tao Guo   Qi Zhao   Linghu Shuangyi   Ma Yanna   Yu Jiaxin  

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We demonstrate an effective approach of mode suppression by simply using a tungsten probe to destroy the external neck surface of polymer microbottle resonators. The higher-order bottle modes with large axial orders, spatially located around the neck surface of the microresonator, will suffer large optical losses. Thus, excitation just with an ordinary free-space light beam will ensure direct generation of single fundamental bottle mode lasers. This method is very low cost and convenient, and can obtain high side mode suppression factors. Our work demonstrated here may have promising applications such as lasing and sensing devices.

       PDF全文 (下载：5)        Chinese Optics Letters ，2019年第17卷第12期 pp.12      

Cui Yuan   Zheng Guoxing   Chen Ming   Zhang Yilun   Yang Yan   Tao Jin   Li Zile  

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Design of a conventional zoom lens is always challengeable because it requires not only sophisticated optical design strategy, but also complex and precise mechanical structures for lens adjustment. Here, we propose a continuous-zoom lens consisting of two chiral geometric metasurfaces with dielectric nanobrick arrays sitting on a transparent substrate. The metalens can continuously vary the focal length by rotating either of the two metasurfaces along its optical axis without changing any other conditions. Because of the polarization dependence of the geometric metasurface, the positive and negative polarities are interchangeable in one identical metalens only by changing the handedness of the incident circularly polarized light, which can generate varying focal lengths ranging from −∞ to +∞ in principle.

       PDF全文 (下载：15)        Chinese Optics Letters ，2019年第17卷第11期 pp.11      

Dong Jia-ning   Fan Jie   Mao Si-da   Lan Yun-ping   Zou Yonggang   Wang Hai-zhu   Zhang Jia-bin   Ma Xiaohui  

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The effect of thermal annealing on the optical properties, microstructure and laser-induced damage threshold (LIDT) of HfO2/Ta2O5/SiO2 HR films have been investigated. The transmission spectra shift to short wavelength and the x-ray diffraction (XRD) diffraction peaks of monoclinic structure HfO2 are enhanced after thermal annealing. The calculated results of m(-111) diffraction peak show that HfO2 grain size is increased, which is conducive to increasing the thermal conductivity. The thermal annealing also reduces the laser absorption of HR films. The improvement of thermal conductivity and the decrease of laser absorption both contribute to the improvement of LIDT. The experimental results show that the highest LIDT of 22.4J/cm2 is obtained at 300℃ annealing temperature. With the further increase of annealing temperature, the damage mechanism of the film changes from thermal stress damage to thermal explosion damage, resulting in the decrease of LIDT

       PDF全文 (下载：6)        Chinese Optics Letters ，2019年第17卷第11期 pp.11      

Li Xiang   wang xiaodan   Ma Hai   Chen Feifei   Zeng Xionghui  

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In this work, Er doped AlN, Pr doped AlN, and Er, Pr co-doped AlN thin films were prepared by ion implantation. After annealing, the luminescence properties were investigated by cathodoluminescence. Some new and interesting phenomena were observed. The peak at 480 nm was observed only for Er doped AlN. However, for Er, Pr co-doped AlN, it disappeared. At the same time, a new peak at 494 nm was observed, although it was not observed for Er-doped AlN or Pr-doped AlN before. Therefore, the energy transfer mechanism between Er3+ and Pr3+ in AlN thin films were investigated in detail. Through optimizing the dose ratio of Er3+ with respect to Pr3+, white light emission with CIE chromaticity coordinate (0.332, 0.332) was obtained. This work may provide a new strategy for realizing white light emission based on nitride semiconductors.

       PDF全文 (下载：1)        Chinese Optics Letters ，2019年第17卷第11期 pp.11      

Fang Fang   Sun Bing   Zhang Zuxing   Xu Jing   Zhang Lin  

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The spectral characteristics and sensitivities of a tapered two-mode fiber (TTMF) sandwiched between two single-mode fibers (SMFs) are systematically proposed. Theoretical calculations reveal that a dispersion turning point (DTP) appears when the group effective refractive index (RI) difference between the fundamental mode and the higher-order mode equals zero, as a result, ultrahigh RI sensitivities can be achieved. Furthermore, the location of the DTP is strongly dependent on the tapering condition. Then we experimentally demonstrate high sensitivities of the RI sensor with the waist diameter of 2.4 μm by means of immersing it in a flow cell filled with glycerol solution. Further tracking the resonant wavelength shift around the DTP it is found that the proposed RI sensor exhibits a sensitivity of 1.81×104 nm/RIU and a limits of detection down up to 3.29×10-5 RIU in glycerol solution.

       PDF全文 (下载：7)        Chinese Optics Letters ，2019年第17卷第11期 pp.11      

Wang Mingjun   Feng Shaodong   Wu Jigang  

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We propose a resolution enhancement method for lensless in-line holographic microscope (LIHM) by combining the hologram segmentation and pixel super-resolution (PSR) techniques. Our method is suitable for imaging specific target object in samples where the in-line hologram is disturbed by other objects in the samples. The resolution-enhancement capability of our method was proved by numerical simulations and imaging experiments while using a standard resolution target in a two-layer setup. We also applied our LIHM system to image the sample of living algae Euglena gracilis in water solution for further demonstration.

       PDF全文 (下载：11)        Chinese Optics Letters ，2019年第17卷第11期 pp.11      

Ma Qungang   Cao Liangcai   He Zehao   Zhang Shengdong  

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In this paper, the principle and the optical methods for light-field display are introduced. The light-field display is divided into three categories, including layer-based method, projector-based method, and integral imaging method. The principle, characteristic, history and advanced research results of each method are also reviewed. The advantages of light-field display are discussed by comparing with other display technologies including binocular stereoscopic display, volumetric 3D display and holographic display.

       PDF全文 (下载：9)        Chinese Optics Letters ，2019年第17卷第11期 pp.11      

Liu xin   Lei Ruoshan   Huang feifei   Deng Degang   Wang Huanping   Zhao shilong   Xu Shiqing  

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BaMoO4: Ho3+/Yb3+ phosphors with different concentrations were fabricated by a gel combustion method. The upconversion (UC) luminescence, intrinsic optical bistability (IOB) and the corresponding mechanisms were reported for the present system. The optical thermometric properties based on the red (5F5 →5I8) and green (5F4/5S2 →5I8) emissions were studied. The sensing sensitivities could be tuned by manipulating the cooperative energy transfer (CET) process. The highest absolute sensitivity was 99 ×10-4 K-1 at 573 K, which was larger than many previous UC materials.

       PDF全文 (下载：0)        Chinese Optics Letters ，2019年第17卷第11期 pp.11