Shi Pingyang   Wu Guiling   Hu Liang   Li Qi   Chen Jianping  

      摘要 + 此论文可免费阅读 (可能需要登录)

We propose a radio frequency (RF) transfer technique with passive phase noise compensation over a fiber-optic ring. By adopting different frequencies and same wavelength (DFSW) transmission and double-sideband with carrier suppression (DSBCS) modulation, the impact of backscattering can be effectively suppressed. A stable RF frequency signal can be obtained frequency-mixing at an arbitrary access site along the fiber-optic ring. As the two-directional transmissions adopt the same fiber and same wavelength from the same laser, the bidirectional propagation symmetry can be maximally guaranteed. We experimentally demonstrate 2 GHz RF signal transfer along a 100 km standard single-mode fiber-optic ring.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Kong Qingqing   Jing Yiqiu   Shen Hua   Deng Shiwei   han zhigang   Zhu Ri Hong  

      摘要 + 此论文可免费阅读 (可能需要登录)

High-power fiber-to-fiber coupling is extensively used in fiber laser applications, and its performance is determined by coupling efficiency. We demonstrate a novel method for alignment and monitoring efficiency by detecting backscattering power at the fiber end cap. The relationship between alignment error and backscattering power is determined by simulations and experiments. Through this method, a state-of-art kW-level Fiber-to-Fiber Optic Switch (FFOS) is developed (transmission efficiency >97%). It performs well for longer than 60 minutes. To the best of our knowledge, it is the first time to establish the mathematical model based on the method. Our results can provide guidance in high-power fiber-to-fiber coupling.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Sun Cuiting   Wang Ran   Jin Xiren   Wang Zemin   Liu Weiliang   Zhang Shuo   Ma Yiwei   Lin Jingyu   Li Yue   Geng Tao   Sun weimin   Qu Zhongquan   Yuan Libo  

      摘要 + 此论文可免费阅读 (可能需要登录)

A novel phase-shifted long-period fiber grating (PS-LPFG) for simultaneous measurement of torsion and temperature is described and experimentally demonstrated. The PS-LPFG is fabricated by inserting a pre-twisted structure into the long-period fiber grating (LPFG) written in single-mode fiber (SMF). Experimental results show that the torsion sensitivities of the two dips are -0.114 nm/(rad/m) and -0.069 nm/(rad/m) in the clockwise direction, and -0.087 nm/(rad/m) and -0.048 nm/(rad/m) in the counterclockwise direction, respectively. The temperature sensitivities of the two dips are 0.057 nm/°C and 0.051 nm/°C, respectively. The two dips of the PS-LPFG exhibit different responses to torsion and temperature. Simultaneous measurement of torsion and temperature can be implemented using a sensor. The feasibility and stabilization of simultaneous torsion and temperature measurement have been confirmed, hence, this novel PS-LPFG demonstrates potential for fiber sensing and engineering applications.

       PDF全文 (下载：0)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Zhang Chunxiang   pang fufei   Liu Huanhuan   Yang Junfeng   Chen Lifeng   Wen Jianxiang   Wang Tingyun  

      摘要 + 此论文可免费阅读 (可能需要登录)

We have demonstrated the highly efficient excitation of LP01 mode in ring-core fibers (RCFs) by tapering the spliced point between the RCF and the standard single-mode fiber (SMF) to optimize all-fiber OAM generation. The tapering technique has been investigated theoretically and experimentally. Before tapering, only 50% of light can be coupled from SMF to RCF. The modal interference spectrum with an extinction ratio (ER) of ~ 9 dB is observed, showing that higher-order modes are excited in RCF. By tapering the spliced point, 90% of light is coupled and the ER is minimized to be ~ 2 dB, indicating that the higher-order modes are effectively suppressed by tapering. Such tapered spliced point of RCF-SMF is further applied for all-fiber OAM generation. The efficiencies of OAM+1 and OAM-1 generation are found to be enhanced by approximate 11.66% and 12.41%, respectively, showing that tapered spliced point of RCF-SMF is a feasible way to optimize OAM generation.

       PDF全文 (下载：0)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Si Zhe   Shen Xiong   Zhu Jingxin   Lin Lei   Bai Lihua   Liu Jun  

      摘要 + 此论文可免费阅读 (可能需要登录)

An all reflective self-referenced spectral interferometry based on transient grating effect is proposed for single-shot measuring the amplitude and phase of ultrashort pulses in a broadband spectral range. Except for a thin third-order nonlinear medium which was used to generate the TG signal, no transmitted optics were used in the proposed device, few-cycle pulses in a broad spectral range from DUV to Mid-IR can be characterized. With a homemade compact and alignment-free device, a 5.0fs pulse at 800nm corresponding to about two cycles and a 14.3fs pulse at 1800 nm corresponding to less than three cycles were successfully characterized.

       PDF全文 (下载：8)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Zou Jieshu   Wang Fei  

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SO2 and NO2 are the most important pollution in atmosphere. An optimized Long Path Differential Optical Absorption Spectroscopy (LP-DOAS) system of high light intensity in ultraviolet (UV) wavelength is proposed and used to measure the concentration of SO2 and NO2 simultaneously. Contrast to the tradition DOAS, the system adopted Y-type optical fiber structure instead of combination of mirrors in the telescope. The UV light intensity test shows that the light intensity of UV can arrive to above 80% of the max measuring range when the light length reach 135m and the integral time of spectrograph is only 15ms.The system is proved to be efficacious through laboratory calibration. The maximum error of SO2 calibration is 4.19% and which is 5.22% for NO2. The error of SO2 and NO2 mixture calibration is within 10%. Field measurement is implemented in a wastewater treatment plant at winter. The measurement light path is 738m. The concentration of SO2 varies from 6μg/m3 (2.26ppb) to 20 μg/m3(7.52ppb), and the concentration of NO2 varies from 100μg/m3 (53.2ppb) to 200 μg/m3 (106.4ppb) approximately. The results are accordance with the data from monitoring station nearby in magnitude order and variation tendency.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Sannomiya Hiromi   Takada Naoki   Sakaguchi Tomoya   Nakayama Hirotaka   Oikawa Minoru   Mori Yuichiro   Kakue Takashi   Shimobaba Tomoyoshi   Ito Tomoyoshi  

      摘要 + 此论文可免费阅读 (可能需要登录)

Systems containing multiple graphics-processing-unit (GPU) clusters are difficult to use for real-time electroholography when using only a single spatial light modulator, because the transfer of the computer-generated hologram data between the GPUs is bottlenecked. To overcome this bottleneck, we propose a rapid GPU packing scheme that significantly reduces the volume of the required data transfer. The proposed method uses a multi-GPU cluster system connected with a cost-effective gigabit Ethernet network. In tests, we achieved real-time electroholography of a 3D video presenting a point-cloud 3D object made up of approximately 200,000 points.

       PDF全文 (下载：0)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Xie Jing   Zhang Junyong   Pan Xue   Zhou Shenlei   Ma Weixin  

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Lens-less Fourier-transform holography has been actively studied because of its simple optical structure and its single-shot recording. However, low-contrast interferogram between the reference and object waves limits its signal to noise ratio. Here, multi-reference lens-less Fourier-transform holography with Greek-ladder sieve array is proposed in experiment and demonstrated effectively to improve the signal to noise ratio. The key technique in our proposed method is a Greek-ladder sieve array, which acts as not only a wave-front modulator but also a beam splitter. With advantages of the common path, single shot, and no need for lens, this system has enormous potential in imaging and especially in extreme ultraviolet and soft X-ray holography.

       PDF全文 (下载：2)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Yang Tieshan   Lin Han   Jia Baohua  

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During the past few years, two-dimensional (2D) materials have attracted tremendous interest on fundamental properties and practical applications. Various methods have been developed to fabricate micro/nanostructures in 2D materials. Direct laser writing (DLW) with the merits of rich light-matter interaction mechanisms, unique three-dimensional processing capability, arbitrary-shape design flexibility and high fabrication accuracy up to tens of nanometers, has been widely applied in the fabrication of micro/nanostructures of 2D materials for functional devices. This timely review summarizes the laser interacts with 2D materials and the advances on diverse 2D materials functional photonics devices by DLW. The perspectives and challenges in designing and improving laser fabricated 2D material photonic devices are also discussed.

       PDF全文 (下载：0)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Zhang Yu   Li Yongzhi   Liu Chao   Liu Zhihai   Zhang Yaxun   Yang Xinghua   Zhang Jianzhong   Yang Jun   Yuan Libo  

      摘要 + 此论文可免费阅读 (可能需要登录)

We propose and demonstrate a dual-channel microfluidic sensor based a side-hole fiber (SHF) with two long-period fiber grating (LPFG) structures. There are two air holes in the SHF, which are nature microfluidic channels. We fabricate two LPFG (LPG-A and LPG-B) in the SHF with the resonance wavelengths of 1268.7 nm and 1385.8 nm, respectively. Results show that the refractive index sensitivity of LPG-A and LPG-B are -76.0 nm/RIU and -71.1 nm/RIU, respectively. One can measure the refractive index of liquid samples in two channels simultaneously. The proposed dual-channel microfluidic sensor has advantages of good linearity response, fluidic technology compatibility, and easy light input/output coupling and system integration, which helps the sensor to have a potential application in environmental detection and food safety detection.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Yang Quanxin   Zhang Xin   Liu Hongliang   wang xuping   Ren Yingying   He Shan   Li Xiaojin   Wu Pengfei  

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In this paper, we report the existence and relaxation properties of a critical phenomena called 3D super crystal, which emerges at "T=" "T" _"C" "-3.5°C" , that is, in proximity of the Curie temperature of the Cu:KTN sample. The dynamics processes of 3D super crystal manifest that its formation contains polarized nanometric regions or/and polarized clusters. However, with strong coupling and interaction of micro components, the characteristic relaxation time, measured by dynamic light scattering, demonstrates fully new relaxation mechanism with much longer relaxation time. As relaxation mechanism of relaxator is so-far undetermined, this research provides a novel perspective. These results can help structure a fundamental theory of ferroelectric relaxation.

       PDF全文 (下载：2)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Wang Jianlei   Zhao Kaiqi   Feng Tao   Zhu Xiaolei   Chen Weibiao  

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A 1.5 J Nd:LuAG ceramic active mirror laser amplifier with high beam quality is demonstrated, in which a 0.8 at% Nd-doped Nd:LuAG ceramic disk with a diameter of 64 mm and a thickness of 5.5 mm is used as laser gain medium, a maximum single-pass small-signal gain of 2.59 is measured when the pump energy is 11.5 J, with an injected seed energy of 0.4 J, a maximum output energy of 1.5 J is obtained at repetition of 10 Hz. By using stimulated Brillouin scattering phase conjugation mirror (SBS-PCM) for wavefront correction, the far field beam spot 1.25 times the diffraction limit(DL) is achieved.

       PDF全文 (下载：2)        Chinese Optics Letters ，2020年第18卷第2期 pp.02      

Wu Biwei   Wang Cong   Luo Zhi   Li Junhui   Man Shu   Ding Kaiwen   Duan Ji'an  

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In this study, we propose an effective method for the fabrication of annulus micro-/nanostructures by femtosecond laser doughnut beam. Compared with the traditional Bessel annulus beam shaping system, this method greatly compresses the light propagation path. And it is theoretically and experimentally demonstrated that the obtained axial section of the peak envelope in the processing area is two waists of the isosceles triangle. By moving the relative position of the sample, annulus microstructures with different diameters on copper sheet could be fabricated. In addition, laser induced periodic surface structures with controllable direction is fabricated by this optical system.

       PDF全文 (下载：3)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Huang Junxiang   Fu Tao   Li Haiou   Shou Zhaoyu   Gao Xi  

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A metal-graphene hybrid metasurface polarization converter is designed in this letter. The unit cell of the hybrid metasurface is composed of a butterfly-shaped structure whose branches are connected by multi-layer graphene sheets. The proposed device can be reconfigured from linear-to-circular polarization to cross-polarization by changing the Fermi energy of graphene. The simulation results show that for 3-layer graphene, the device acts as a linear-to-circular polarization converter when EF = 0 eV, and switches to a cross-polarization converter when EF = 0.5 eV. Compared with single-layer graphene, the device with 3-layer graphene can maintain the cross-polarization conversion performance under low Fermi energy. Furthermore, two equivalent circuits in the x and y directions are developed to understand the working mechanism of the device.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

miaomao He   sheng Chen   quanxin Na   shaojuan Luo   haiyong zhu   Li Ying   changwen Xu   Fan Dianyuan  

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A power-scaled laser operation of Pr:YLF crystal at 720.9 nm pumped by a 443.6 nm laser diode module was demonstrated. The 20 W module was used to pump the Pr:YLF crystal and a maximum output power of 3.03 W with slope efficiency of 30.04% was obtained. In addition, a 5W blue laser diode (LD) was also used to pump the Pr:YLF laser and a maximum output power of 0.72 W was obtained at room temperature. The output power was limited by the wavelength mismatch between the single-emitter LD and the absorption peak of the crystal.

       PDF全文 (下载：2)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Xie Kun   Liu Wenguang   Qiong Zhou   Jiang zongfu   Xi Fengjie   Xu Xiaojun  

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In this paper, a novel system for adaptively correcting the phase of a dynamic multimode beam is proposed. While using merely one spatial light modulator, the phase measurement of the 1st order diffraction pattern and the correction of the 0th diffraction order are simultaneously realized. The real-time experimental result is obtained at a control rate of 10 Hz. The power-in-the-bucket value is improved from 38.5% to 61.8% even with fundamental mode content that is consistently below than 30%. To the best of our knowledge, this is the first implementation of real-time adaptive correction of the entire multimode beam.

       PDF全文 (下载：5)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

zhang wei   Gao Weiqing   liang chen   hui jiang   xiong zhang   xiu zhang   yun gao   Zhou Yong   Liao Meisong   Suzuki Takenobu   Yasutake Ohishi Yasutake Ohishi   xie kang  

      摘要 + 此论文可免费阅读 (可能需要登录)

Brillouin gain spectra (BGS) in an As2Se3 photonic crystal fiber (PCF) are investigated numerically. The profiles of the BGS are simulated by calculating the characteristics of different-order optical and acoustic waves in the PCFs with different core diameters. For the small-core PCF, there are two peaks in BGS, but there is only one peak for the large-core PCF. We also reveal that in the small-core PCF, the difference of Brillouin frequency shift between the LP01 and LP11 mode is obvious, while it is not obvious in the large-core PCF. The Brillouin threshold increases with the core diameter increasing.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Lu Guojun   Liu Hongzhan  

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In order to improve the signal-to-noise ratio and mitigate the damage of noise to the communication quality, an effective interference suppression algorithm, which is based on the improved density-based spatial clustering of applications with noise (DBSCAN) algorithms, is proposed for visible light communication (VLC) system using the com-plementary metal oxide semiconductor (CMOS) image sensor as receiver (Rx). Experimental result show that the algorithm can learn the region where the payload data is located, filter out the noise data and can greatly decreased the interference. The effect of the algorithm is also studied through BER performance.

       PDF全文 (下载：12)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Zheng Kangjia   Zou Weiwen   Yu Lei   Qian Na   Chen Jianping  

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We investigate a channel-interleaved photonic analog-to-digital converter (PADC) system’s ability to work stably over a long duration with optimal driving voltage. The influence of optimum bias point drift of a Mach-Zehnder modulator (MZM)-based photonic switch on this system was analyzed theoretically and experimentally. The feasibility of extracting feedback signals from the PADC system was derived. A high-stability channel-interleaved PADC was constructed by extracting a feedback signal from a parallel demultiplexing module to control the MZM-based photonic switch’s driving voltage. Consequently, the amplitude mismatch between the channels was limited to within 0.3 dB over 12 hours of operation.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Yang Dan   Huang Yongqing   Liu Tao   Ma Xiaokai   Duan Xiaofeng   Liu kai   Ren Xiaomin  

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We have designed and fabricated zero-bias operational two-element symmetric-connected photodetector arrays (SC-PDA). The designed SC-PDA have higher saturation currents, larger RF power, and better frequency responses than the single PD under zero bias. The bias-free SC-PDA with 15 μm diameter of each PD demonstrated a 3 dB bandwidth of 19.4 GHz at 0.5 mA. The RF saturation photocurrent and maximum RF output power of the SC-PDA with 40 μm, 50 μm, and 60 μm diameter under zero bias is over 9.31 mA and -5.86 dBm at 3 GHz, 14.52 mA and 1.17 dBm at 1GHz, 13.72 mA and -1.76 dBm at 1 GHz, respectively.

       PDF全文 (下载：9)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Cheng Jiaju   Luo Jianwen  

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For fluorescence molecular tomography (FMT), image-quality could be improved by incorporating sparsity constrain. L1 norm regularization method is proved better than L2 norm like Tikhonov regularization. However, Tikhonov method was found capable of achieving similar quality at high iteration cost by adopting zeroing strategy. By studying the reason, a Tikhonov-regularization-based projecting sparsity pursuit method was proposed which reduces the iterations significantly and achieves good image-quality. It was proved in phantom experiments through time-domain FMT that the method could obtain higher accuracy and less over-sparsity and is more applicable for heterogeneous-target reconstruction, compared with several regularization methods implemented in this paper.

       PDF全文 (下载：4)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Saadon Haitham   Abbas Saeed   Shubar Mohammed  

      摘要 + 此论文可免费阅读 (可能需要登录)

Bi2S3-xSex/PMMA nanocomposite films were prepared using a microwave assisted synthesis with different compositions of x. Crystal structure, surface morphology, and optical properties were performed to characterize the prepared nanocomposite films. The crystallinity and optical band gap of the prepared Bi2S3-xSex/PMMA were affected by x. The prepared samples showed a blue shift in the absorption edge. The laser power dependent nonlinear refraction and absorption of Bi2S3-xSex/PMMA nanocomposite films were investigated by using the Z-scan technique. The optical nonlinearity of the nanocomposite films exhibited switchover from negative nonlinear refraction to positive nonlinear refraction to negative nonlinear refraction effect, and from saturable absorption to reverse saturable absorption to saturable absorption with increase and decrease in the composition. An interesting of all-optical figures of merit was reported to assess the nanocomposite films for a practical device. It were calculated the device all-figures of merit based on the nonlinear response, which is important for all-optical switching device. The results demonstrate that the optimized all-optical figures of merit can be achieved by adjusting the composition and input laser power, which can be used for the design of different all-photonic devices, as well as the results of nonlinear switching behavior can be open new possibility of using the nanocomposite films in laser Q-switching and mode-locking.

       PDF全文 (下载：1)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Gao Yachen   Shuang Chen   Suying Yang   Huang Yan   Weiyan Jiao   Guanghua Fan  

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The dipole resonances of gold nanocages were investigated theoretically using finite difference time domain (FDTD). The results show that field enhancement is obtained at the walls of the gold nanocages. It is believed that the effect can cause strong optical nonlinear property. To test the hypothesis, the nonlinear absorption was investigated using broadband 5ns Z-scan. It was found that, at low intensities the sample shows saturation absorption (SA), while at higher intensities, a switch from SA to reverse saturation absorption (RSA) occurs. Moreover, the nonlinear absorption of sample is sensitively wavelength-dependent, and in resonant region saturation intensity is the largest.

       PDF全文 (下载：7)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Yuan Xupeng   Guo Xinjun   Zhao Miao   Li Yao   Gan Zongsong   Ruan Hao  

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In this Letter, new approach of optical tape for high capacity multilayer data storage is proposed. We show that a length of 5 cm and width of 2 cm soft and transparent optical tape can be used for two-photon three-dimensional bit data storage. We successfully demonstrate writing and reading of six layers of data storage with a transverse bit separation of 2 μm and an axial separation of 2.5 μm in a tetraphenylethylene-doped photobleaching polymer. Thus, the optical tape what we put forward in the experiment can help people realize true big data storage in the future likes magnetic tape. This method significantly paves a novel way for solving big data storage problem.

       PDF全文 (下载：5)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Xiao ZhiLei   Quan Wei   Xu SongPo   Yu ShaoGang   Wang YanLan   Zhao Meng   Wei MingZheng   Zhou Yu   Lai Xuan-yang   Chen(陈京) Jing   Liu Xiaojun  

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Coulomb potential may induce a significant angular offset to the 2-dimensional photoelectron momentum distributions for atoms subject to strong elliptically polarized laser field. In the attoclock experiment, this offset usually cannot easily be disentangled from the contribution of tunneling delay and poses a main obstacle to the precise measurement of tunneling delay. Based on semiclassical calculations, here we propose a method to extract the equivalent temporal offset induced solely by Coulomb potential (TOCP) in an attoclock experiments. Our calculations indicate that, at constant laser intensity, the TOCP show distinctive wavelength dependence laws for different model atoms and the ratio of the target atom's TOCP to that of H becomes insensitive to wavelength and linearly proportional to (2I_p )^(-3⁄2), where I_p is the ionization potential of the target atom. This wavelength and I_p dependence of TOCP can be further applied to extract the Coulomb potential influence. Our work paves the way for an accurate measurement of the tunneling delay in the tunneling ionization of atoms subject to intense elliptically polarized laser field.

       PDF全文 (下载：7)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Fan Haibo   Mu Yining   Liu ChunYang   zhu yan   Liu Guozhen   Wang Shuai   Li Yanzheng   Du Peng  

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Aiming at the application requirements of information optics, this paper proposed a perovskite quantum dot random lasing pumping method suitable for high-speed modulation. At the same time, the luminescence characteristics of perovskite quantum dot films under electron beam pumping conditions are analyzed, and the random lasing mechanism of electron beam pumping CsPbBr3 quantum dot films is revealed. Finally, It is confirmed that perovskite quantum dots are easy to realize random lasing under electron beam pumping conditions.

       PDF全文 (下载：17)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Li Zhenhua   Cheng Chuanfu   liu Hanping   Li Dawei   Xu Shicai   Liu Huilan   Zhang Junye   Zhang Suzhen  

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In this Letter, we fabricate integrated metasurface of encoded dynamic phases and experimentally generate nonconventional Kagome-type lattices of no second-order phase vortices. The thin metasurface acts analogous to an integration of three conventional optical elements, i.e., six pinholes located at the vertices of two concentric regular triangles of size ratio 1:2, six transparent discs of different thicknesses to introduce a total phase shift difference of 6π and a Fourier lens with focal length in micro-scale. Kagome lattice with required vortex distribution is realized at the “focal” plane of the metasurface under illumination of plane wave.

       PDF全文 (下载：12)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Zhang Chi   Fu Dongying   Xia Chunli   Yao Lishuang   Lu Chunlian   Sun weimin   Liu Yongjun  

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In this paper, a dye-doped cholesteric liquid crystal (DDCLC) filled hollow glass microsphere is demonstrate to be a resonator with good temperature response. A diglycerol layer is used to wrap the DDCLCs microdroplet to keep it steady and control its orientation. The whispering gallery mode (WGM) lasing and photonic band gap (PBG) lasing caused by two different mechanisms were obtained under the pump of a pulsed laser, and the temperature response of these two kind of lasing were studied. For the liquid crystal and chiral material used in this paper, both the WGM lasing and the PBG lasing have a blue shift in wavelength with increasing temperature.

       PDF全文 (下载：7)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Cao Liang   YU Yang   Xiao Min   Yang Junbo   Zhang Xue-liang   Meng Zhou  

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In order to meet the practical needs of all-fiber CTD sensor with high sensitivity, compact structure and easy packaging, this paper uses a microfiber coupler combined with Sagnac loop (MCSL) reflective photonic device to conduct salinity, temperature and deep sensing experiments.These MCSLs’ dynamic range and resolution of salinity, temperature, and depth can meet the requirements of actual marine environment monitoring. This structure opens up a new design idea for the practical research of MC-based marine environmental parameter sensor.

       PDF全文 (下载：3)        Chinese Optics Letters ，2020年第18卷第1期 pp.01      

Ikawa Shohei   Takada Naoki   Araki Hiromitsu   Niwase Hiroaki   Sannomiya Hiromi   Nakayama Hirotaka   Oikawa Minoru   Mori Yuichiro   Kakue Takashi   Shimobaba Tomoyoshi   Ito Tomoyoshi  

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We demonstrate real-time three-dimensional (3D) color video using color electroholographic system with a cluster of multiple-graphics processing units (multi-GPU) and three spatial light modulators (SLMs) corresponding to respective red, green, and blue (RGB)-colored reconstructing lights. The multi-GPU cluster has a computer-generated hologram (CGH) display node containing a GPU, for displaying calculated CGHs on SLMs, and four CGH calculation nodes using 12 GPUs. The GPUs in the CGH calculation node generate CGHs corresponding to RGB reconstructing lights in a 3D color video using pipeline processing. Real-time color electroholography was realized for a 3D color object comprising approximately 21,000 points per color.

       PDF全文 (下载：4)        Chinese Optics Letters ，2020年第18卷第1期 pp.01