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Influence of Nd^(3+) concentration on mid-infrared emission in PbF_(2) crystal co-doped with Ho^(3+) and Nd^(3+) ions

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Journal of Rare Earths 2024年第3期42卷 479-487,I0002页

作者： Yan Chen Juncheng Tan Peixiong Zhang Weibi Zheng Lin Li Lianhan Zhang Zhen Li Yin Hang Zhenqiang Chen Department of Optoelectronic engineering Jinan UniversityGuangzhou510632China guangdong provincial engineering research centerof crystal and laser technology.guangzhou 510632China research Center of laser crystal Key Laboratory of High Power Laser MaterialsShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai201800China

A promising series of Ho_(y)Nd_(x)Pb_((1-x-y))F_2(x = 0, 0.01, 0.02, 0.03, 0.04;y = 0.02) crystals was grown by the Bridgman method. The influence of the Nd^(3+)ions concentration on mid-infrared(~2.0, ~2.9 and ~3.9 μm)fluorescence emissions of Ho^(3+)ions in the PbF_(2) crystal excited by 808 nm laser diode was investigated in this work. The energy transfer mechanism between Nd^(3+)ions and Ho~(3+)ions under different concentrations of the Nd^(3+)ions was systematically analyzed. The results show that the Nd^(3+)ions have good sensitization and deactivation effect on the Ho^(3+)ions to stimulate the mid-infrared fluorescence emissions. The experimental analysis proves that the sensitization efficiency of the Nd^(3+)ions is relatively stable at around 93.45% with varying Nd^(3+)-doping concentrations. Concentration dependence studies indicate that the concentration of the Nd^(3+)ions has significant influence on mid-infrared *** the doping concentration of the Nd^(3+)ions is up to 2.0 at%, the intensity of ~2.0, ~2.9 and ~3.9 μm emissions all reach the maximum. The output characteristics of a 3.9 μm laser are simulated, and it is found that with the increase of the Nd^(3+)-doping concentration, the peak power, pulse width, and peak energy all meet the trend of first increasing and then decreasing, and Ho_(0.02)Nd_(0.02)Pb_(0.96)F_(2) crystal displays the best performance. All the results show that the Nd^(3+)/Ho^(3+)co-doped PbF_(2) crystals might act as a useful optical medium for mid-infrared laser applications.

关键词： crystal growth Mid-infrared PbF_(2) Rare earth ions

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Spin-orbit Rabi oscillations in optically synthesized magnetic fields

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Light(Science & Applications) 2023年第9期12卷 1930-1942页

作者： Guohua Liu Xiliang Zhang Xin Zhang Yanwen Hu Zhen Li Zhenqiang Chen Shenhe Fu Department of Optoelectronic engineering Jinan UniversityGuangzhou 510632China guangdong provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632China guangdong provincial engineering research Center of crystal and laser technology Guangzhou 510632China

Rabi oscillation has been proven to be one of the cornerstones of quantum mechanics,triggering substantial investigations in different disciplines and various important applications both in the classical and quantum *** far,two independent classes of wave states in the Rabi oscillations have been revealed as spin waves and orbital waves,while a Rabi wave state simultaneously merging the spin and orbital angular momentum has remained *** we report on the experimental and theoretical observation and control of spin–orbit-coupled Rabi oscillations in the higher-order regime of *** constitute a pseudo spin-1/2 formalism and optically synthesize a magnetization vector through light-crystal *** observe simultaneous oscillations of these ingredients in weak and strong coupling regimes,which are effectively controlled by a beam-dependent synthetic magnetic *** introduce an electrically tunable platform,allowing fine control of transition between different oscillatory modes,resulting in an emission of orbital-angular-momentum beams with tunable topological *** results constitute a general framework to explore spin–orbit couplings in the higher-order regime,offering routes to manipulating the spin and orbital angular momentum in three and four *** close analogy with the Pauli equation in quantum mechanics,nonlinear optics,etc.,implies that the demonstrated concept can be readily generalized to different disciplines.

关键词： field orbital momentum

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Higher-order optical rabi oscillations

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Fundamental research 2023年第6期3卷 898-903页

作者： Guohua Liu Shenhe Fu Siqi Zhu Hao Yin Zhen Li Zhenqiang Chen Department of Optoelectronic engineering Jinan UniversityGuangzhou 510632China guangdong provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632China guangdong provincial engineering research Center of crystal and laser technology Guangzhou 510632China

Rabi oscillations express a phenomenon of periodic conversion between two wave states in a coupled *** finding of Rabi oscillation has led to important applications in many different *** great progress,it is still unknown whether the Rabi oscillating state can be excited in the framework of the higher-order vector vortex ***,we demonstrate in theory that the higher-order vector vortex light beams can be Rabi oscillating during evolution in an optical coupling *** new classical oscillating state of light is characterized by a topologically shaped wavefront and coupled with spatially varying *** vector vortex state exhibits a harmonic oscillatory property in the resonant and nonresonant conditions but differs greatly in Rabi oscillating *** Rabi oscillation,the complex state maintains its topology and intensity profile,while its intrinsic polarization pattern varies adiabatically in a periodic *** present an interpretation of the Rabi oscillation of the higher-order wave states in terms of the coupled-mode ***,we reveal a symmetry-protected transition between two Rabi oscillating modes,driven by a slowly varying phase *** Rabi transition has not been reported in either quantum mechanics or any other physical *** work advances the research of Rabi oscillation into the higher-order regime,and it may lead to novel applications in classical and quantum optics.

关键词： Rabi oscillations Vector vortex light fields Higher-order beams Polarization control Coupled mode system

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Classification of hyperspectral images for detection of hepatic carcinoma cells based on spectral-spatial features of nucleus

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Journal of Innovative Optical Health Sciences 2020年第1期3卷 123-131页

作者： Yao Chen Siqi Zhu Shenhe Fu Zhen Li Furong Huang Hao Yin Zhenqiang Chen guangdong provincial engineering research Center of crystal and laser technology Guangzhou 510632P.R.China guangdong provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632P.R.China Department of Optoelectronic engineering Jinan University Guangzhou 510632P.R.China guangdong provincial Key Laboratory of Industrial Ultrashort Pulse laser technology Shenzhen 518055.P.R.China

A distinguishing characteristic of normal and cancer cells is the difference in their nuclear chromatin content and *** difference can be revealed by the transmission spectra of nuclei stained with a pH-sensitive ***,we used hematoxylin-eosin(HE)to stain hepatic carcinoma tissues and obtained spectral-spatial data from their nuclei using hyper-spectral *** transmission spectra of the nuclei were then used to train a support vector machine(SVM)model for cell ***,we found that the chromatin distribution in cancer cells is more uniform,because of which the correlation coefficients for the spectra at different points in their nuclei are ***,we exploited this feature to improve the SVM *** sensitivity and specificity for the identification of cancer cells could be increased to 99%and 98%,*** also designed an image-processing method for the extraction of information from cell nuclei to automate the identification process.

关键词： Hyperspectral imaging cancer cells biomedical detection

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Dynamic gain driven mode-locking in GHz fiber laser

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Light(Science & Applications) 2024年第11期13卷 2715-2725页

作者： Xuewen Chen Wei Lin Xu Hu Wenlong Wang Zhaoheng Liang Lin Ling Yang Yang Yuankai Guo Tao Liu Dongdan Chen Xiaoming Wei Zhongmin Yang School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and DevicesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouChina research Institute of Future technology South China Normal UniversityGuangzhouGuangdongChina

Ultrafast lasers have become powerful tools in various fields,and increasing their fundamental repetition rates to the gigahertz(GHz)level holds great potential for frontier scientific and industrial *** various schemes,passive mode-locking in ultrashort-cavity fiber laser is promising for generating GHz ultrashort pulses(typically solitons),for its simplicity and ***,its pulse energy is far lower than the critical value of the existing theory,leading to open questions on the mode-locking mechanism of GHz fiber ***,we study the passive mode-locking in GHz fiber lasers by exploring dynamic gain depletion and recovery(GDR)effect,and establish a theoretical model for comprehensively understanding its low-threshold mode-locking mechanism with multi-GHz fundamental repetition ***,the GDR effect yields an effective interaction force and thereby binds multi-GHz solitons to form a counterpart of soliton *** is found that the resulting collective behavior of the solitons effectively reduces the saturation energy of the gain fiber and permits orders of magnitude lower pulse energy for continuous-wave mode-locking(CWML).A new concept of quasi-single soliton defined in a strongly correlated length is also proposed to gain insight into the dynamics of soliton assembling,which enables the crossover from the present mode-locking theory to the existing ***,two distinguishing dynamics of Q-switched mode-locking that respectively exhibit rectangular-and Gaussian-shape envelopes are theoretically indicated and experimentally verified in the mode-locked GHz fiber laser through the measurements using both the standard real-time oscilloscope and emerging time-lens *** on the proposed criterion of CWML,we finally implement a GDR-mediated mode-locked fiber laser with an unprecedentedly high fundamental repetition rate of up to 21 GHz and a signal-tonoise ratio of 85.9 dB.

关键词： fiber mode locking

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Controlling upconversion through interfacial energy transfer(IET):Fundamentals and applications

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Journal of Rare Earths 2020年第5期38卷 474-482页

作者： Bo Zhou Qiqing Li Long Yan Qinynuan Zhang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniquesand Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSouth China University of TechnologyGuangzhou 510641China

Photon upconversion has received substantial attention owing to its great promise in broad applications from bioimaging to other frontier fields like display,upconversion laser,information security and anticounterfeiting.A smart control and manipulation of the upconversion luminescence has always been a key topic,however,to date the most efficient mechanism for upconversion nanoparticles remains the energy transfer upconversion and recently reported energy migration mediated ***,we found that the interfacial energy transfer(IET)is also an efficient approach for enabling and tuning photon upconversion of lanthanide ***,it can be used for the mechanistic understanding of the interionic interactions such as energy transfer and energy migration on the *** this review,the recent advances of the research on the IET are summarized,the principles for designing IET process and typical examples are discussed together with its applications in both mechanistic research and frontier information *** challenges and perspectives for future research are also commented.

关键词： Photon upconversion Interfacial energy transfer Core-shell nanostructure Rare earth ions

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Online Monitoring of Welding Status Based on a DBN Model During laser Welding

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engineering 2019年第4期5卷 671-678页

作者： Yanxi Zhang Deyong You Xiangdong Gao Seiji Katayama guangdong provincial Welding engineering technology research Center Guangdong University of TechnologyGuangzhou 510006China Joining and Welding research Institute Osaka UniversityOsaka 567-0047Japan

In this research,an auxiliary illumination visual sensor system,an ultraviolet/visible(UVV)band visual sensor system(with a wavelength less than 780 nm),a spectrometer,and a photodiode are employed to capture insights into the high-power disc laser welding *** features of the visible optical light signal and the reflected laser light signal are extracted by decomposing the original signal captured by the photodiode via the wavelet packet decomposition(WPD)*** captured signals of the spectrometer mainly have a wavelength of 400-900 nm,and are divided into 25 sub-bands to extract the spectrum features by statistical *** features of the plume and spatters are acquired by images captured by the UVV visual sensor system,and the features of the keyhole are extracted from images captured by the auxiliary illumination visual sensor *** on these real-time quantized features of the welding process,a deep belief network(DBN)is established to monitor the welding status.A genetic algorithm is applied to optimize the parameters of the proposed DBN *** established DBN model shows higher accuracy and robustness in monitoring welding status in comparison with a traditional back-propagation neural network(BPNN)*** effectiveness and generalization ability of the proposed DBN are validated by three additional experiments with different welding parameters.

关键词： Online monitoring Multiple sensors Wavelet packet decomposition Deep belief network

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Optical edge-to-screw singularity state conversions

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Photonics research 2024年第8期12卷 1689-1695页

作者： HAOLIN LIN JUNHUI JIA GUOHUA LIU YANWEN HU ZHEN LI ZHENQIANG CHEN SHENHE FU Department of Optoelectronic engineering Jinan UniversityGuangzhou 510632China guangdong provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632China guangdong provincial engineering research Center of crystal and laser technology Guangzhou 510632China

Optical singularity states,which significantly affect propagation properties of light in free space or optical medium,can be geometrically classified into screw and edge *** different types of singularity states do not exhibit direct connection,being decoupled from each other in the absence of external *** we demonstrate a novel optical process in which a higher-order edge singularity state initially nested in the propagating Gaussian light field gradually involves into a screw singularity with a new-born topological charge determined by order of the edge *** considered edge state comprises an equal superposition of oppositely charged vortex and antivortex *** theoretically and experimentally realize this edge-to-screw conversion process by introducing intrinsic vortex–antivortex *** also present a geometrical representation for mapping this dynamical process,based on the higher-order orbital Poincaré*** this framework,the edge-to-screw conversion is explained by a mapping of state evolution from the equator to the north or south pole of the Poincaré*** demonstration provides a novel approach for manipulating singularity state by the intrinsic vortex–antivortex *** presented phenomenon can be also generalized to other wave systems such as matter wave,water wave,and acoustic wave.

关键词： interaction Poincaré wave

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Hybrid Eu(II)-bromide scintillators with efficient 5d-4f bandgap transition for X-ray imaging

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Light(Science & Applications) 2024年第10期13卷 2321-2330页

作者： Kai Han Jiance Jin Yuzhen Wang Xinquan Zhou Yongsheng Sun Lihan Chen Zhiguo Xia The State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Centre of Special Optical Fiber Materials and DevicesSchool of Physics and OptoelectronicsSouth China University of TechnologyGuangzhouChina School of Materials Science and engineering South China University of TechnologyGuangzhouChina

Luminescent metal halides are attracting growing attention as scintillators for X-ray imaging in safety inspection,medical diagnosis,*** we present brand-new hybrid Eu(II)-bromide scintillators,1D type[Et4N]EuBr3·MeOH and 0D type[Me4N]6Eu5Br16·MeOH,with spin-allowed 5d-4f bandgap transition emission toward simplified carrier transport during scintillation *** 1D/0D structures with edge/face-sharing[EuBr6]4−octahedra further contribute to lowing bandgaps and enhancing quantum confinement effect,enabling efficient scintillation performance(light yield~73100±800 Ph MeV^(−1),detect limit~18.6 nGy s^(−1),X-ray afterglow~1%@9.6μs).We demonstrate the X-ray imaging with 27.3 lp mm^(−1) resolution by embedding Eu(II)-based scintillators into AAO *** results create the new family of low-dimensional rare-earth-based halides for scintillation and related optoelectronic applications.

关键词： process. bromide transition

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Fabrication of crystalline selenium microwire

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Chinese Physics B 2017年第4期26卷 472-475页

作者：彭帅唐国武孙敏刘旺旺单秀杰钱奇陈东丹张勤远杨中民 State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials South China University of TechnologyGuangzhou 510640China guangdong engineering technology research and Development Center of Special Optical Fiber Materials and Devices South China University of TechnologyGuangzhou 510640China guangdong provincial Key Laboratory of Fiber laser Materials and Applied Techniques South China University of TechnologyGuangzhou 510640China

A method of fabricating selenium（Se） microwire is demonstrated.A multimaterial fiber with amorphous selenium（a-Se） core and multicomponent phosphate glass cladding is drawn by using a conventional optical fiber drawing *** the a-Se core of the fiber is crystallized by a post thermal process at 150 ℃.After the multicomponent phosphate glass cladding is stripped from the multimaterial fiber by marinating the fiber in HF acid solution,a crystalline selenium（c-Se）microwire with high uniformity and smooth surface is *** on microstructure measurements,the c-Se microwire is identified to consist of most hexagonal state particles and very few trigonal state *** good photoconduction property of c-Se microwire with high quality and longer continuous length makes it possible to apply to functional devices and arrays.

关键词： selenium semiconductor crystalline microwires optical fiber technology photoconductivity ma-terials

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