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multi-wavelength continuous-wave Nd:YVO4 self-Raman laser under in-band pumping

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Chinese Physics B 2019年第8期28卷 184-189页

作者： Li Fan Xiao-Dong Zhao Yun-Chuan Zhang Xiao-Dong Gu Hao-Peng Wan Hui-Bo Fan Jun Zhu College of Physics Science and Technology Institute of Applied Photonic Technology Yangzhou University

multi-wavelength continuous-wave self-Raman laser with an a-cut composite YVO4/Nd:YVO4/YVO4 crystal pumped by an 879-nm wavelength-locked laser diode is demonstrated for the first ***-wavelength Raman lasers at 1168.4,1176,1178.7,and 1201.6 nm are achieved by the first Stokes shift of the multi-wavelength fundamental lasers at 1064,1066.7,1073.6,1084,and 1085.6 nm with two Raman shifts of 890 and 816 cm^-1.A maximum Raman output power of 2.56 W is achieved through the use of a 20-mm-long composite crystal,with a corresponding optical conversion efficiency of 9.8%.The polarization directions of different fundamental and Raman lasers are investigated and found to be orthogonalπandσ*** orthogonally polarized multi-wavelength lasers with small wavelength separation pave the way to the development of a potential laser source for application in spectral analysis,laser radar and THz generation.

关键词： multi-wavelength continuous-wave self-Raman laser in-band pumping

multi-wavelength study of MGRO J2019+37

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Chinese Physics C 2014年第8期38卷 40-47页

作者：侯超陈松战袁强曹臻何会海盛祥东 Institute of High Energy Physics Chinese Academy of Sciences

MGRO J2019＋37, within the Cygnus region, is a bright extended source revealed by Milagro at 12 35 TeV. This source is ahnost as bright as the Crab Nebula in the northern sky, but is not confirmed by ARGO-YBJ around the TeV scale. Up to now, no obvious counterpart at low energy wavelengths has been found. Hence, MGRO J2019＋37 is a rather mysterious object and its VHE γ-ray emission mechanism is worth investigating. In this paper, a brief summary of the multi-wavelength observations from radio to γ-rays is presented. All the available data from XMM-Newton and INTEGRAL at X-ray, and Fermi-LAT at γ-ray bands, are used to get constraints on its emission flux at low energy wavelengths. Then, its possible counterparts and the VHE emission mechanism are discussed.

关键词： MGRO J2019+37 multi-wavelength VHE γ-ray radiation mechanism

A Raman laser system for multi-wavelength satellite laser ranging

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Science China(Physics,Mechanics & Astronomy) 2004年第6期47卷 737-743页

作者： K.Hamal I.Prochazka J.Blazej Czech Technical University in Prague CzechCzech Technical University in PragueCzechCzech Technical University in PragueCzech

In order to develop a laser system for multi-wavelength satellite laser ranging, the joint group of the Shanghai Astronomical Observatory and the Czech Technical University has studied the conversion efficiency of the Raman-shifting beam and its spatial characteristics. We adopted a 0.53 μm laser with pulse width of 35 ps and peak energy of 35 mJ, the second harmonic of a Nd:YAG actively and passively mode-locked laser, to pump a one-meter-long Raman tube which is full of H2 with high pressure at the Prague-based laboratory. We get the first Stokes laser (0.68 μm): 7 mJ (single pulse) with beam divergence of 40″ (arcsecond) and spatial wobbling of less than 4″; and the first anti-Stokes laser (0.43 μm): 2 mJ (single pulse) with divergence of 56″ and spatial wobbling of less than 4″. The emitting beam from the Raman cell also includes 0.53 μm: 10 mJ (single pulse) with divergence of 40″ and spatial wobbling of less than 7″. According to the radar link equation and based on the above obtained multi-wavelength’s energy, we can estimate the detection probabilities for three colors respectively. It is shown by the result that the developed multi-wavelength Raman laser system has the capability of satellite ranging. The Raman laser system will be installed at the laser station in Shanghai Astronomical Observatory to research the multi-wavelength satellite laser ranging.

关键词： multi-wavelength satellite laser ranging, Raman laser, atmosphere correction, detection probability.

New Solution to Surface Temperature of Casting Slab Measurement Based on Preceded Reflector and multi-wavelength

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Journal of Iron and Steel Research International 2012年第8期19卷 12-16页

作者： LIU Jun1, MA Jiao-cheng2, YANG Feng3, XIAO Hui1, RAO Li-min1 (1. School of Nuclear Engineering and Technology, East China Institute of Technology, Fuzhou 344000, Jiangxi, China 2. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, Liaoning, China 3. School of Civil and Environmental Engineering, East China Institute of Technology, Fuzhou 344000, Jiangxi, China) [a] School of Nuclear Engineering and Technology East China Institute of Technology Fuzhou 344000 Jiangxi China [b] School of Mechanical Engineering and Automation Northeastern University Shenyang 110004 Liaoning China [c] School of Civil and Environmental Engineering East China Institute of Technology Fuzhou 344000 Jiangxi China

The surface temperature of casting slab is an important parameter in the metallurgy field. Because the surface emissivity is uncertain and also unknown, it is difficult to measure the slab surface temperature accurately. A method based on preceded reflector and multi-wavelength was put forward to deal with the difficulty in surface temperature measurement of casting slab. On the premise of preceded reflector and non-preceded reflector, the method establishes the radiation energy equations and works out the emissivity and temperature in the equations. Also, the multilayer modeling of casting slab surface and multiple reflection-absorption process modeling were built by Monte Carlo method. The temperature measuring method had been applied in the continuous casting field. In order to verify the measured result, the thermal imaging method was adopted when the slab surface emissivity was set by repeated tests. Finally, the measured and verified temperature curves keep a same tendency and the error of the values is lower than 5℃. The comparison result shows that the method can measure temperature accurately.

关键词： casting slab emissivity surface temperature preceded reflector multi-wavelength

multi-wavelength fiber ring laser based on semiconductor optical amplifier and sampled fiber Bragg grating in a Sagnac loop interferometer

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中国激光 2009年第3期36卷 688-690页

作者：冯素春许鸥鲁韶华宁提纲简水生 Institute of Light wave Technology Key Laboratory of All Optical Net work and Advanced Telecommunication Network of Ministry of Education Beijing Jiaotong University Institute of Lightwave Technology Key Laboratory of All Optical Net work and Advanced Telecommunication Network of Ministry of Education Beijing Jiaotong University Institute of Lightwave Technology Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education Beijing Jiaotong University

multi-wavelength fiber ring laser based on the semiconductor optical amplifier(SOA)with sampled fiber Bragg grating(SFBG)in a Sagnac loop interferometer as the wavelength-selective filter is *** lasing wavelengths with 1.8 nm spacing have been generated stably at room *** proposed laser has the advan-tages such as removal of the high-cost circulator,flexibility in channel-spacing tuning,and simple all-optical fiber configuration,which has potential applications in high-capacity wavelength-division-multiplexed(WDM)systems and mechanical sensors.

关键词： laser technique fiber laser multi-wavelength semiconductor optical amplifier Sagnac loop interferometer sampled fiber Bragg grating

Extraction of Surface Roughness from the Central δ-peak of Light Scattering Using a multi-wavelength Ar~+ Laser

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Chinese Journal of Lasers 2000年第3期9卷 22-27页

作者： LIU Deli QI Dongping CHENG Chuanfu (Department of Physics, Shandong Normal University, Jinan 250014, China) 山东师范大学山东济南

In this paper, a new light scattering method for measuring t he roughness of random surfaces is proposed. The method is based on the relation between the specularly reflected intensity I s, i.e., the central δ-peak intensity and wave vector component k z. The linear fit of the logarithm graph of the normalized central δ-peak intensity I sr versus k-2 z, whose variation is induced by changing illuminating wavelength, gives the square of the surface roughness w. The roughnesses of 6 silicon backside samples were measured.

关键词： random surface roughness light scattering multi-wavelength

Fiber laser with simultaneous multi-wavelength Er/Yb passively Q-switched and single-wavelength Tm gain-switched operations

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Photonics Research 2019年第6期7卷 608-614页

作者： J.ALANIZ-BAYLON M.DURAN-SANCHEZ R.I.ALVAREZ-TAMAYO B.POSADA-RAMIREZ M.BELLO-JIMENEZ B.IBARRA-ESCAMILLA A.A.CASTILLO-GUZMAN E.A.KUZIN Instituto Nacional de Astrofísica óptica y Electrónica (INAOE)L. E. Erro 1 Sta. Ma. Tonantzintla Pue. 72824 Mexico CONACyT-Instituto Nacional de Astrofísica óptica y ElectrónicaA. P. 51 y 216 Pue. 72000 Mexico CONACyT-Universidad Autónoma de Nuevo León Av.Universidad S/NSan Nicolas de los Garza N. L. 66451 Mexico Instituto de Investigación en Comunicación óptica Universidad Autónoma de San Luis Potosí Av. Karakorum 1470 S. L. P. 78210 Mexico Universidad Autónoma de Nuevo León Av.Universidad S/NSan Nicolas de los Garza N. L. 66451 Mexico

We report the experimental investigation of an all-fiber multi-wavelength passively Q-switched Er/Yb laser with simultaneous gain-switched pulsed operation by using a thulium-doped fiber as a saturable *** emission is obtained in three wavelength regions with central peaks at around 1546 nm, 1561 nm, and1862 nm. multi-wavelength emission with separation of approximately 1 nm is obtained around the wavelength regions of 1546 nm and 1561 nm. Stable laser pulses are generated in the pump power range from 3.6 W to7.3 W.

关键词： Fiber laser multi-wavelength

Ultra-long-period grating-based multi-wavelength ultrafast fiber laser [Invited]

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Chinese Optics Letters 2021年第7期19卷 48-55页

作者： Bo Guo Xinyu Guo Lige Tang Wenlei Yang Qiumei Chen Zhongyao Ren Key Laboratory of In-fiber Integrated Optics Ministry of EducationHarbin Engineering UniversityHarbin 150001China

We propose and demonstrate the cascaded multi-wavelength mode-locked erbium-doped fiber laser(EDFL) based on ultralong-period gratings(ULPGs) for the first time, to the best of our *** found that the ULPG can be used as both a mode-locker for pulse shaping and a comb filter for multi-wavelength generation *** the dual-function of ULPG, three-, four-, five-, six-, and seven-wavelength mode-locked pulses are obtained in EDFL, seven of which are the largest number of wavelengths up to *** the four-wavelength soliton pulses, their pulse width is about 7.8 *** maximum average output power and slope efficiency of these pulses are 8.4 m W and 2.03%, *** the conventional pulses, hybrid soliton pulses composed of a four-wavelength pulse and single soliton are also ***, the effect of cavity dispersion on the multi-wavelength mode-locked pulses is also *** findings indicate that apart from common sensing and filtering, the ULPG may also possess attractive nonlinear pulse-shaping property for ultrafast photonics application.

关键词： ultra-long-period grating fiber laser ultrafast laser multi-wavelength

Self-powered lead-free quantum dot plasmonic phototransistor with multi-wavelength response

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Photonics Research 2019年第2期7卷 149-154页

作者： YU YU YATING ZHANG LUFAN JIN ZHILIANG CHEN YIFAN LI QINGYAN LI MINGXUAN CAO YONGLI CHE HAITAO DAI JUNBO YANG JIANQUAN YAO Key Laboratory of Opto-Electronic Information Technology (Tianjin University) Ministry of EducationSchool of Precision Instruments and Opto-Electronics EngineeringTianjin University Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin University Center of Material Science National University of Defense Technology

Because they possess excellent visible light absorption properties, lead-free colloidal copper-based chalcogenide quantum dots(QDs) have emerged in photoelectronic fields. By means of localized surface plasmonic resonance(LSPR), the absorption properties of QDs can be enhanced. In this paper, we fabricate a lead-free CuInSe2 QD field effect phototransistor(FEpT) by utilizing the LSPR enhancement of Au nanoparticles(NPs). The plasmonic FEpT demonstrates responsivity up to 2.7 μA· W^(-1) and a specific detectivity of 7 × 10~3 Jones at zero bias under illumination by a 532 nm laser, values that are enhanced by approximately 200% more than devices without Au NPs. Particularly, the FEpT exhibits a multi-wavelength response, which is photoresponsive to 405, 532,and 808 nm irradiations, and presents stability and reproducibility in the progress of ON–OFF ***, the enhancement induced by Au NP LSPR can be interpreted by finite-difference time domain simulations. The low-cost solution-based process and excellent device performance strongly underscore leadfree CuInSe2 QDs as a promising material for self-powered photoelectronic applications, which can be further enhanced by Au NP LSPR.

关键词： Self-powered lead-free multi-wavelength