2022

• Record 373 of
  
  Title:Development status, trend and key technologies of air-based laser communication
  
  Author(s):Zheng, Yunqiang(1,2); Liu, Huan(1,2); Meng, Jiacheng(1,2); Wang, Yufei(1,2); Nie, Wenchao(1,2); Wu, Junxia(1,2); Yu, Tingting(1,2); Wei, Sentao(1,2); Yuan, Zhanchao(1,2); Wang, Wei(1,2); Xie, Xiaoping(1,2)
  Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering  Volume: 51  Issue: 6  DOI: 10.3788/IRLA20210475  Published: June 2022  
  Abstract:Laser communication, with its wide bandwidth, good confidentiality and no electromagnetic spectrum constraints, has become an effective means to construct high-speed communication in the air, space, earth and sea integrated communication networks. Compared with space-based, the air-based laser communication system, which is carried on balloon, airship, unmanned aerial vehicle aircraft and other platforms, has become the first choice for high security military network, disaster relief emergency network and commercial low-cost network due to its good flexibility, low cost and good maintainability. The latest research progress and main parameters of air-based laser communication system in USA, Germany, France and China are introduced in detail. The trend of one-to-many, lighter weight, wider bandwidth and the challenges of complex atmospheric channel and serious background noise are summarized, and key technical method, such as high dynamic capturing and tracking, high density integration and high sensitivity reception are proposed, which can provide references for air-based laser communication research. © 2022 Chinese Society of Astronautics. All rights reserved.
  Accession Number: 20223812744267
• Record 374 of
  
  Title:Use of electrochemistry in mini-/micro-LEDs and VCSELs
  
  Author(s):Kang, Jin-Ho(1); Elafandy, Rami(1); Li, Bingjun(1); Song, Jie(2); Han, Jung(1)
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 12022  Issue:   DOI: 10.1117/12.2611573  Published: 2022  
  Abstract:As optoelectronic semiconductor research reaches a level of saturation, incorporation of unconventional processes and techniques often add to new phenomena and opportunities. In this manuscript, we share our perspective regarding the application of electrochemistry to GaN and related compound semiconductors. Two specific examples of using nanoporous structures, created by electrochemistry, for mini-/micro- LEDs and for vertical cavity surface emitting lasers (VCSELs) are discussed. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
  Accession Number: 20222312194634
• Record 375 of
  
  Title:Experimental demonstration of optical trapping and manipulation with multifunctional metasurface
  
  Author(s):Li, Xingyi(1,2); Zhou, Yuan(1,2); Ge, Suyang(1,2); Wang, Guoxi(1,2); Li, Siqi(1); Liu, Zilei(1,2); Li, Xing(1,2); Zhao, Wei(1,2); Yao, Baoli(1,2); Zhang, Wenfu(1,2)
  Source: Optics Letters  Volume: 47  Issue: 4  DOI: 10.1364/OL.450490  Published: February 15, 2022  
  Abstract:Chip-scale optical tweezers, which are usually implemented in a planar format without using bulky diffractive optical elements, are recognized as a promising candidate to be integrated with a lab-on-a-chip system. However, traditional chip-scale optical tweezers are often static and allow for only one type of manipulation functionality since the geometrical parameters of the tweezers are fixed. Herein, we introduce a new, to the best of our knowledge, class of on-chip optical tweezers for diverse types of manipulation of micro-particles. Utilizing both the propagation phase and Pancharatnam-Berry phase, we experimentally demonstrate the spin-dependent trapping, moving, and circling of micro-particles with the transfer of optical gradient force and orbital angular momentum to particles. We further show that the spin angular momentum of the output beam provides an additional degree of freedom to control the spinning rotation of particles. This new type of optical tweezers paves the way for multifunctional and dynamical trapping and manipulation of particles with a lab-on-a-chip system. © 2022 Optica Publishing Group
  Accession Number: 20220711646216
• Record 376 of
  
  Title:Simultaneous generation of a broadband MIR and NIR frequency comb in a GaP microring
  
  Author(s):Wang, Yi(1,2); Shi, Lei(1,2); Wu, Wei(1,2); Ming, Xianshun(1); Sun, Qibing(1); Wang, Leiran(1,2); Zhao, Wei(1,2)
  Source: Applied Optics  Volume: 61  Issue: 10  DOI: 10.1364/AO.454007  Published: April 1, 2022  
  Abstract:Midinfrared (MIR) optical frequency combs are of great significance as broadband coherent light sources used in extensive areas such as coherent communications and molecule detections. Conventional MIR combs are usually restricted in size and power, while most microcombs are focused in the near-infrared (NIR) region because of the limited accessible Q-factor of microrings and the poor performances of available pumps. In this paper, we numerically demonstrate the simultaneous generation of a broadband MIR and NIR comb in a GaP microring with an additive waveguide. The achieved octave-spanning (1890-4050 nm)MIRmicrocomb at a lowpump power of 34 mW can be effectively converted to the second-harmonic NIR comb covering 1120-1520 nm with separate dispersion optimization of the ring cavity and straight waveguide. The proposed system has the advantage of simple structure and lowpower threshold, which could find potential in highly integrated MIRoptical sources and related applications. © 2022 Optica Publishing Group.
  Accession Number: 20221311864800
• Record 377 of
  
  Title:Intense 2.71-μm fluorescence emission in low hydroxyl heavily Er3+-doped fluorotellurite glass for mid-infrared fiber laser
  
  Author(s):Feng, Shaohua(1,2); Liu, Chengzhen(1,2); Cui, Jian(1,2); Xu, Yantao(1,2); Li, Man(3); Xiao, Xusheng(1,2); Ma, Wenchao(3); Guo, Haitao(1,2,4)
  Source: Journal of Non-Crystalline Solids  Volume: 586  Issue:   DOI: 10.1016/j.jnoncrysol.2022.121569  Published: June 15, 2022  
  Abstract:Heavily Er3+-doped TeO2–BaF2–La2O3–LaF3 (TBLL) glasses with low hydroxyl absorption (αOH− ≈ 0.025 cm−1) and high glass transition temperatures (Tg > 437 °C) were prepared. The Raman spectra and differential scanning calorimetry (DSC) curves were measured to characterize the structural and thermal properties of the glass samples. The emission properties of Er3+-doped TBLL glasses were studied under a 980 nm LD excitation, and the related transition mechanism was discussed. Intense fluorescence emission was noted at 1.55 μm and 2.71 μm, and the intensities of emissions increased monotonically as the Er2O3 doping concentration increased from 0.5 to 6.0 mol%. The absorption and emission cross sections of Er3+-doped TBLL glass at 2.71 μm were estimated to be 7.90 × 10−21 and 8.47 × 10−21 cm2 using the Fuchtbauer–Ladenburg theory, respectively, which are much higher than those of many reported tellurite glasses. Furthermore, the undoped and 6.0 mol% Er2O3 doped TBLL bare fibers were prepared. Their chemical durability was tested in deionized water, and the results indicated that the TBLL glass exhibited good antideliquescence ability. Finally, a broad emission band at ∼2720 nm was detected in the 6.0 mol% Er2O3 doped TBLL bare fiber. These results demonstrate that the novel Er3+-doped TBLL fluorotellurite glass is a candidate for ∼3 μm fiber lasers. © 2022
  Accession Number: 20221311874140
• Record 378 of
  
  Title:Light-controlled pulsed x-ray tube with photocathode
  
  Author(s):Xuan, Hao(1,2); Liu, Yong-An(1); Qiang, Peng-Fei(1); Su, Tong(1); Yang, Xiang-Hui(1); Sheng, Li-Zhi(1); Zhao, Bao-Sheng(1)
  Source: Chinese Physics B  Volume: 30  Issue: 11  DOI: 10.1088/1674-1056/abff1e  Published: January 2022  
  Abstract:Unstable mechanical structure, low energy efficiency, and cooling requirements limit the application of conventional x-ray tubes based on filament as cathode in several academic areas. In this paper, we demonstrate a light-controlled pulsed x-ray tube using multialkali cathode as electron generator. The photocathode active area of the light controlled x-ray tube is 13.2 cm2 (41 mm in diameter), which provides high photoelectron-emitting efficiency up to 0.288 mA/lm in 460-nm LED and 2.37-mA maximum tube current. Furthermore, the modulation ability from 1 kHz to 100 kHz of the x-ray tube is tested. The results suggest that the light-controlled pulsed x-ray tube has easy modulation and short x-ray pulse properties and is promising to be the next generation x-ray tube with wide applications in medical radiationtherapy as well as the calibration for detectors and scintillators. © 2021 Chinese Physical Society and IOP Publishing Ltd.
  Accession Number: 20220211453141
• Record 379 of
  
  Title:Hybrid Wavelength- and Mode-division Multiplexing System Based on Microring Resonators with Mode Splitters
  
  Author(s):Han, Xilin(1,2); Zhang, Lingxuan(1,2); Xue, Jintao(1,2); Bao, Shenlei(1,2); Wu, Jinyi(1,2); Mi, Lei(1)
  Source: Guangzi Xuebao/Acta Photonica Sinica  Volume: 51  Issue: 11  DOI: 10.3788/gzxb20225111.1113002  Published: November 2022  
  Abstract:The applications of silicon photonics in data bearer networks， data centers and other scenarios will support high-speed data transmission. In order to meet the demand， lots of technologies in silicon photonics have emerged， such as Wavelength Division Multiplexing （WDM），Polarization Division Multiplexing （PDM） and Mode Division multiplexing （MDM）. To further increase the channel capacity， the hybrid multiplexing technology is studied based on the technologies above. Our work is such a hybrid WDM-MDM multiplexer. This paper focuses on the design of a microring resonator with mode splitter. First of all， the effect of mode splitting is better at a longer length， but we need to put the mode splitter into the microring resonator， and such a high mode separation efficiency and coupling efficiency will lead to low efficiency of microring resonance. So， we take the appropriate length. Secondly， an asymmetric structure for the geometry of the mode splitter is designed. One side of the structure is a waveguide with a width of 0.88 nm， allowing high order mode transmission， and the other side is a slot waveguide with a width of 0.86 nm， with an air gap of 50 nm in the middle. The advantage of this structure is that it can effectively split TE0and TE1 modes. In addition， for microring resonators， we can select the desired resonant wavelength by designing appropriate parameters such as radius， waveguide width， coupling region length and gap. By simulating the proposed structure with the finite difference time domain method， the multiplexer and demultiplexer can realize ultra-compact WDM-MDM structure at C band. The microring resonator has a response of -0.66 dB to TE1 mode input， a Q value of 3 692， and an optical bandwidth of 52 GHz. Its free spectral range is 1.03 THz， and the crosstalk generated by TE0 mode is -11.0 dB. The insertion loss of the microring resonator is as low as -0.66 dB. Based on this， we also propose a transmitter-receiver MDM system with dual mode input. The simulation results show that the dual-mode input MDM system based on microring resonator can effectively separate TE0 and TE1 modes， and the microring also has the ability of wavelength selection. In addition， the through ports with fabrication tolerance from -10 nm to +15 nm have responses of less than -20 dB， while the response of the drop ports remains within -1 dB. Compared with other devices， our design has advantages in insertion loss， crosstalk and FSR. In conclusion， proposed system using wavelength-mode multiplexing mircroring can effectively separate the TE0 and TE1 modes and has the ability of wavelength selection， which may be the main device for ultra-compact hybrid multiplexing technology in near future. © 2022 Chinese Optical Society. All rights reserved.
  Accession Number: 20224513074554
• Record 380 of
  
  Title:The influence of different antimony content in Ga-As-Sb-S chalcogenide glass system: Modification of physical & spectroscopic properties and fiber forming ability
  
  Author(s):Cui, Jian(1,2,4); Zhang, Hao(1,2); Liu, Lutao(1,2); Xu, Yantao(2); Xiao, Xusheng(2); Li, Man(4); Ma, Wenchao(4); Guo, Haitao(1,2,3)
  Source: Ceramics International  Volume: 48  Issue: 18  DOI: 10.1016/j.ceramint.2022.05.247  Published: September 15, 2022  
  Abstract:In order to improve the fiber drawing performances including the anti-crystallization in fiber drawing process and the mechanical properties, the fourth component of antimony (Sb) was introduced into Ga0.8As39.2S60 glass, and a serial Ga0.8As39.2-xSbxS60 (x = 0, 1, 3,5, 7, 9 and 11) novel chalcogenide glasses doped with 3000 ppmw Dy3+ ions were prepared. The influences of antimony content on the physical properties, spectroscopic properties and fiber forming ability of glass were investigated. The experiment results indicate that the introduction of moderate antimony into glass effectively improves the fiber drawing performance and the spectroscopic properties of Dy3+ ions. The Ga0.8As34.2Sb5S60 composition glass possesses the best performance and it is recommended a good candidate for mid-infrared laser working medium. © 2022 Elsevier Ltd and Techna Group S.r.l.
  Accession Number: 20222312205130
• Record 381 of
  
  Title:Nanosecond-scale all-optical Ti3C2T x-MXene modulator
  
  Author(s):Li, Erkang(1); Jiang, Man(1); Li, Duidui(1); Wang, Ruiduo(2); Kang, Xin(1); Wang, Tianqi(1); Ren, Zhaoyu(1)
  Source: Applied Physics Express  Volume: 15  Issue: 2  DOI: 10.35848/1882-0786/ac4a12  Published: February 2022  
  Abstract:Inspired by recent advancements of graphene-based ultrafast photonic devices, Ti3C2T x-MXene, as a graphene-like two-dimensional layer-structure material, has gained extensive interest in nonlinear optical applications, especially in all-optical intensity modulation. Herein, we successfully fabricated an all-optical modulator based on Ti3C2T x-Mxene/polyvinyl-alcohol film with nanosecond-scale response time, modulation speed of 100 kHz, and modulation depth of 10%. Furthermore, the variation of fall edges of modulated signal pulse caused by thermo-optic effect under different pump power was also observed. Considering the ease of fabrication, low cost, and ease of integration, the proposed modulator may open the door for high-speed all-optical communications and signal processing. © 2022 The Japan Society of Applied Physics.
  Accession Number: 20220611611863
• Record 382 of
  
  Title:Discussion on spatial resolution of microscopic imaging system (invited)
  
  Author(s):Dang, Shipei(1,2); Li, Runze(1); Zhou, Meiling(1); Qian, Jia(1); Dan, Dan(1); Yu, Xianghua(1); Yao, Baoli(1,2)
  Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering  Volume: 51  Issue: 11  DOI: 10.3788/IRLA20220735  Published: November 2022  
  Abstract:Spatial resolution is a key specific parameter of the optical microscopic imaging system. According to the optical diffraction theory, the spatial resolution of imaging system is determined by the wavelength of illumination light and the numerical aperture of microscope objective. In the practical imaging process, the resolutions of microscopic imaging system obtained from different criteria are slightly different. It is necessary to select an appropriate criterion according to the coherence of light sources and the structural characteristics of obsversed targets to accurately calculate the resolutions of imaging system. In this paper, the calculation methods for spatial resolution under different conditions are provided via theoretical analysis and numerical simulation. Furthermore, we compare and discusse the difference of imaging resolutions under the illuminations of coherent and incoherent light sources for double points and double slits targets, respectively. © 2022 Chinese Society of Astronautics. All rights reserved.
  Accession Number: 20225113262637
• Record 383 of
  
  Title:The generation of broadband photosource in fiber amplifier with different seed lasers - soliton and dissipative soliton pulse
  
  Author(s):Zhang, Chenxi(1); Li, Xiaohui(1); Han, Yueheng(1); Mu, Ye(1); Shi, Yuan(2); Wang, Yishan(3); Zhao, Wei(3)
  Source: Optics and Laser Technology  Volume: 156  Issue:   DOI: 10.1016/j.optlastec.2022.108450  Published: December 2022  
  Abstract:Soliton and dissipative soliton have different pulse width, pulse energy, and propagation behaviors. The results are quite different for the generation of broadband photosource. In this work, broadband photosource with a wide spectral range based on two pulsed seed lasers is investigated. A high flatness spectrum with a bandwidth greater than 300 nm and predicted spectrum up to 2000 nm covering Er and Tm emission regime has been obtained by amplifying soliton pulsed laser. 370-mW higher average power broadband photosource has been obtained based on the amplification of dissipative soliton lasers. The proposed broadband photosource does not need to add further nonlinear medium in case of introducing unnecessary losses. These results pave the way for the realization of broadband, high flatness spectrum, compact light sources, and the use of all-fiber optic structure to lay the foundation for integration and detection applications, etc. © 2022 Elsevier Ltd
  Accession Number: 20223112456898
• Record 384 of
  
  Title:Overcoming the snaking instability and nucleation of dark solitons in nonlinear Kerr media by spatially inhomogeneous defocusing nonlinearity
  
  Author(s):Liu, Xiuye(1,2); Zeng, Jianhua(1,2)
  Source: Chaos, Solitons and Fractals  Volume: 156  Issue:   DOI: 10.1016/j.chaos.2022.111803  Published: March 2022  
  Abstract:Dark solitons, localized nonlinear waves with center notch standing on a stable uniform background, own rich formation and dynamics for physics and applications in diverse fields, and have thus recently attracted many theoretical and experimental studies. Transverse modulational instability is an impeditive factor for dark solitons in multidimensional space, to stabilize them various methods have been proposed. We here take use of a purely nonlinear strategy by introducing quasi-one-dimensional Gaussian like trap, and its combination with the external linear harmonic trap, in the framework of the (2 + 1)-dimensional Gross-Pitaveski/nonlinear Schrödinger equation, to realize the stabilization mechanism of dark-soliton stripes. Variational approximation analytical method, linear-stability analysis and direct perturbed numerical simulations are adopted to carry out the study, and agreement is reached. We demonstrate that the dark-soliton stripes can be stabilized completely, and the associated modulational instability wave number band is reduced greatly. Particularly, in the case of linear harmonic trap, the nucleation of dark solitons, subjected to snaking instability, can be overcome by the nonlinear trap with both defocusing and focusing strengths. The predicted results may be realized in Bose-Einstein condensates and nonlinear optics. © 2022 Elsevier Ltd
  Accession Number: 20220511582168