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Mid-IR Dual-Wavelength Difference Frequency Generation Using Fiber Lasers as Pump and Signal Light Sources

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Chinese Physics Letters 2009年第12期26卷 153-155页

作者：蒋建常建华冯素娟毛庆和刘文清 anhui provincial key lab of photonics devices and materials Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031

A continuous-wave mid-IR difference frequency laser source, which respectively uses an ytterbium-doped fiber laser as the pump source and a multiwavelength erbium-doped fiber laser cascaded with an erbium-doped fiber amplifier as the signal source, is demonstrated. Our experimental results show that two stable mid-IR radiation lines with a spacing of about 5.4nm may be simultaneously emitted by a suitable setting the pump and signal polarization orientations. The number of the mid-IR radiation lines is limited by the quasi-phase-matching acceptance bandwidth. By changing the PPMgLN temperature the two mid-IR radiation lines may be synchronously tuned in the mid-IR range between 3295 and 3356.3nm.

关键词： Optics quantum optics and lasers

Influences of finite gain bandwidth on pulse propagation in parabolic fiber amplifiers with distributed gain profiles

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Chinese Physics B 2012年第9期21卷 345-352页

作者：赵佳生李磐陈晓东冯素娟毛庆和 anhui provincial key laboratory of photonics devices and materials Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences University of Science and Technology of China

The evolutions of the pulses propagating in decreasing and increasing gain distributed fiber amplifiers with finite gain bandwidths are investigated by simulations with the nonlinear SchrSdinger equation. The results show that the parabolic pulse propagations in both the decreasing and the increasing gain amplifiers are restricted by the finite gain bandwidth. For a given input pulse, by choosing a small initial gain coefficient and gain variation rate, the whole gain for the pulse amplification limited by the gain bandwidth may be higher, which is helpful for the enhancement of the output linearly chirped pulse energy. Compared to the decreasing gain distributed fiber amplifier, the increasing gain distributed amplifier may be more conducive to suppress the pulse spectral broadening and increase the critical amplifier length for achieving a larger output linearly chirped pulse energy.

关键词： finite gain bandwidth parabolic pulse linearly chirped pulse energy

Simultaneous low extinction and high local field enhancement in Ag nanocubes

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Chinese Physics B 2011年第3期20卷 1-8页

作者：周飞刘晔李志远 laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences anhui provincial key lab of photonics devices and materials Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031

We theoretically investigate surface plasmon resonance properties in Au and Ag cubic nanoparticles and find a novel plasmonic mode that exhibits simultaneous low extinction and high local field enhancement properties. We analyse this mode from different aspects by looking at the distribution patterns of local field intensity, energy flux, absorption and charge density. We find that in the mode the polarized charge is highly densified in a very limited volume around the corner of the nanocube and results in very strong local field enhancement. Perturbations of the incident energy flux and light absorption are also strongly localized in this small volume of the corner region, leading to both low absorption and low scattering cross section. As a result, the extinction is low for the mode. Metal nanoparticles involving such peculiar modes may be useful for constructing nonlinear compound materials with low linear absorption and high nonlinearity.

关键词： surface plasmon resonance low extinction local field enhancement

Roles of Co element in Fe-based bulk metallic glasses utilizing industrial FeB alloy as raw material

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Progress in Natural Science:materials International 2017年第4期27卷 503-506页

作者： Shouyuan Wang Wei Jiang Haidong Hu Pengfeng Liu Jili Wu Bo Zhang School of materials Science and Engineering & anhui provincial key lab of Functional materials and devices Hefei University of Technology

A series of Fe-based bulk metallic glasses were fabricated by a conventional copper mold casting method using a kind of Fe-B industrial raw alloy. It is found that Fe-B-Y-Nb bulk metallic glass with 3 at% of Co addition possesses the best glass forming ability, thermal stability, hardness, magnetic property and anti-corrosion property. The hardness test result indicates a synchronically trend with glass-forming ability parameters. The excellent glass-forming ability and a combination of good mechanical and functional properties suggest that the alloys in this work might be good candidates for commercial use.

关键词： Bulk metallic glasses Glass forming ability Hardness Magnetic Corrosion resistance

Effect of Mo on properties of the industrial Fe–B-alloy-derived Fe-based bulk metallic glasses

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International Journal of Minerals,Metallurgy and materials 2017年第8期24卷 926-930页

作者： Kai-rui Zhu Wei Jiang Ji-li Wu Bo Zhang School of materials Science and Engineering Hefei University of Technology anhui provincial key lab of Functional materials and devices Hefei University of Technology

The experimental results concerning the effects of Mo on the glass-forming ability(GFA), thermal stability, and mechanical, anticorrosion, and magnetic properties of an(Fe_(71.2)B_(24)Y_(4.8))_(96)Nb_4 bulk metallic glass(BMG) were presented. An industrial Fe–B alloy was used as the raw material, and a series of Fe-based BMGs were synthesized. In BMGs with the Mo contents of approximately 1at%–2at%, the cast alloy reached a critical diameter of 6 mm. The hardness and fracture strength also reached their maximum values in this alloy system. However, the anticorrosion and magnetic properties of the BMGs were not substantially improved by the addition of Mo. The low cost, good GFA, high hardness, and high fracture strength of the Fe-based BMGs developed in this work suggest that they are potential candidates for commercial applications.

关键词： bulk metallic glasses alloying elements hardness magnetic property corrosion resistance

Influences of cavity dispersion distribution on the output pulse properties of an all-normal-dispersion fiber laser

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Chinese Physics B 2015年第7期24卷 268-274页

作者：李磐时雷孙青冯素娟毛庆和 anhui provincial key laboratory of photonics devices and materials Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences Beijing Aerospace Control Instrument Research Institute Optics Division National Institute of Metrology

In this paper, the influences of the dispersion distribution in the cavity on the output pulse properties of the all-normaldispersion（ANDi） fiber laser are investigated. Our simulations show that, as the relative length of the dispersion fiber increases, the temporal width and the spectral bandwidth of the output pulse for an ANDi fiber laser with fixed total cavity dispersion or fiber length are decreased, while the pulse energy is enhanced and the compressed pulse width is *** simulation predictions have been proved by our experimental results. The reason may be that the nonlinear phase shift accumulated in the nonlinear fiber is more than that in the dispersion fiber if they have the same length.

关键词： mode-locked lasers fiber lasers dispersion nonlinearity

An All-Fiber Gas Raman Light Source Based on a Hydrogen-Filled Hollow-Core Photonic Crystal Fiber Pumped with a Q-Switched Fiber Laser

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Chinese Physics Letters 2011年第7期28卷 118-121页

作者： CHEN Xiao-Dong MAO Qing-He SUN Qing ZHAO Jia-Sheng LI Pan FENG Su-Juan anhui provincial key lab of photonics devices and materials Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031 State key laboratory of Pulsed Power Laser Technology Optoelectronics DepartmentElectronic Engineering InstituteHefei 230037

A gas Raman light source based on a H2−filled hollow-core photonic-crystal-fiber cell with a Q-switched fiber laser followed by a fiber amplifier as the Raman pump source is *** Stokes frequency-shift lasing line is observed at 1135.7 nm with the Q-switched pump pulses at 1064.7 *** experimental results show that the generated Stokes pulse is much narrower than the pump pulse,and the generated Stokes pulse duration is increased with the single pulse energy for the same duration pump *** the 125 ns pump pulses with a repetition rate of 5 kHz,the Raman threshold pump energy and the conversion efficiency at the Raman threshold are 2.13µJ and 9.82%.Moreover,by choosing narrower pump pulses,the Raman threshold pump energy may be reduced and the conversion efficiency may be improved.

关键词： pump fiber switched

Accuracy improvement of calibration-free laser-induced breakdown spectroscopy

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Plasma Science and Technology 2019年第3期21卷 6-15页

作者： Hongbo FU Zhibo NI Huadong WANG Junwei JIA Fengzhong DONG anhui provincial key laboratory of photonics devices and materials Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences key laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences University of Science and Technology of China

Calibration-free laser-induced breakdown spectroscopy can overcome the matrix effect and the huge application prospects of in situ and on-line measurement, so it has been studied and applied to many analytical samples by numerous researchers since it was first proposed in ***, its accuracy is always lower than other analytical techniques and traditional quantitative analysis methods of laser-induced breakdown spectroscopy. The goal of this paper is to review the improvement of accuracy in the experimental setup and spectral analysis,especially after 2010, but not limited to it. The main contents include the accurate measurement of spectral intensity, the spatial and temporal window of local thermodynamic equilibrium and the accurate calculation of temperature and electron density. Due to the requirement of one or more standard samples, the combination of standard samples and CF-LIBS is discussed as a separate section. Finally, a simple conclusion is offered to relevant researchers who want to use CF-LIBS for quantitative analysis.

关键词： CF-LIBS quantitative analysis accuracy self-absorption local thermodynamic equilibrium

Isothermal crystallization in Ce_(70)Ga_6Cu_(24) bulk metallic glass

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1870-1874页

作者： JIANG WeiXin ZHANG Bo School of Material Science and Engineering Hefei University of Technology anhui provincial key lab of Functional materials and devices Hefei University of Technology

The isothermal crystallization behaviors in a newly developed CeGaCu bulk metallic glass have been investigated through the classic differential scanning calorimeter （DSC） method. It is found that the apparent activation energy （Ea） strongly depends on the fraction （x） of isothermal crystallization. Johnson-Mehl-Avrami （JMA） formula was used to analyze the mechanism of crystallization and the obtained Avrami exponent （n） was discovered to show an obvious correlation with the crystallization fraction x. With the help of the relation between Ea and n, the nucleation and growth activation energies, En and Eg, were estimated to be 214-304 kJ/mol and 91 kJ/mol, respectively. This result suggests that the main energy barrier against crystallization in the present glass should be the nucleation of nucleates, rather than the growth of crystals. Such a large E, is also believed to be responsible for the good glass forming ability of the CeGaCu alloy.

关键词： Ce-based bulk metallic glass activation energy Avrami exponent nucleation and growth