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Non-spherical aluminum nanoparticles fabricated using picosecond laser ablation

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 980-986页

作者： A.Brahma Swamulu S.Venugopal Rao G.Krishna Podagatlapalli Department of Physics Rajiv Gandhi University of Knowledge TechnologiesNuzvidAndhra Pradesh 521202India Advanced Centre of Research in High Energy Materials(ACRHEM) University of HyderabadHyderabad 500046TelanganaIndia Department of Electronics&Physics Gandhi Institute of Technology and Management Institute of ScienceGandhi Institute of Technology and Management deemed to be UniversityVisakhapatnam 530045Andhra PradeshIndia

We report the picosecond laser ablation of aluminum targets immersed in a polar organic liquid(chloroform,CHCl3)with^2 ps laser pulses at an input energy of^350μ*** synthesized aluminum nanoparticles exhibited a surface plasmon resonance peak at^340 *** electron microscopy images of Al nanoparticles demonstrated the spherical morphology with an average size of(27±3.6)*** formation of smaller spherical Al nanoparticles and the diminished growth could be from the formation of electric double layers on the Al *** addition to spherical aluminum nanoparticles,triangular/pentagonal/hexagonal nanoparticles were also observed in the colloidal *** emission scanning electron microscopy images of ablated Al targets demonstrated laser induced periodic surface structures(LIPSSs),which were the high spatial frequency LIPSSs(HSF-LIPSSs)since their grating period was^280 ***,coarse structures with a period of^700 nm were observed.

关键词： ablation picosecond silver polar periodic surfaces electric double layers

Effect of thermally induced birefringence on high power picosecond azimuthal polarization Nd:YAG laser system

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Chinese Physics B 2019年第2期28卷 234-240页

作者： Hongpan Peng Ce Yang Shang Lu Ning Ma Meng Chen Laser Engineering Research Institute Beijing University of Technology

Pulse-burst 1064-nm picosecond azimuthal polarization beam amplification up to an average power of 16.32 W using side-pumped Nd: YAG amplifiers has been demonstrated. The maximum envelop energy as much as 16.32 mJ, corresponding to a power amplification factor of 299.5%. A simple criterion was defined to help estimate the amount of depolarization in Nd:YAG amplifier stages. The degree of depolarization of the beam was 7.1% and the beam quality was measured to be M2= 3.69. The reason for the azimuthal polarization depolarization and beam quality degradation were explained theoretically and experimentally during the amplification process.

关键词： azimuthal polarization thermally induced birefringence Nd:YAG amplifiers picosecond laser

High-energy picosecond single-pass multi-stage optical parametric generator and amplifier

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Chinese Physics B 2022年第1期31卷 281-285页

作者： Yang Yu Zhao Liu Ke Liu Chao Ma Hong-Wei Gao Xiao-Jun Wang Yong Bo Da-Fu Cui Qin-Jun Peng Key Laboratory of Solid-state Lasers Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Functional Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

We demonstrate a new management of multi-stage optical parametric generator(OPG)and amplifier(OPA)to obtain high-energy picosecond sources with high beam *** setup of multi-stage OPG-OPA requires mode-matching between the pump beam and the stable mode of the *** a proof-of-principle experiment,the single-pass multi-stage OPG-OPA consists of three walk-off compensated KTP crystal pairs and two lenses,pumped by an 86 ps,1064 nm 10 kHz picosecond *** signal light at~1.77μm has an average output power of 502 mW with record energy up to 50.2μ*** beam quality factor of the signal light can be improved toM^(2)_(x) ×M^(2)_(y)after filtering out about 40%signal *** the best of our knowledge,it is the first picosecond single-pass multi-stage OPG-OPA pumped at kHz regime.

关键词： high-energy picosecond optical parametric frequency conversion

picosecond Laser Surface Texturing of a Stavax Steel Substrate for Wettability Control

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Engineering 2018年第6期4卷 816-821页

作者： Xincai Wang Hongyu Zheng Yinchi Wan Wenhe Feng Yee Cheong Lam Singapore Institute of Manufacturing Technology(SIMTech) A*STARSingapore 138634Singapore SIMTech-NTU Joint Laboratory(Precision Machining) Nanyang Technological UniversitySingapore 639798Singapore School of Mechanical Engineering Shandong University of TechnologyZibo 255000China

In this investigation,a picosecond laser was employed to fabricate surface textures on a Stavax steel substrate,which is a key material for mold fabrication in the manufacturing of various polymer *** main types of surface textures were fabricated on a Stavax steel substrate:periodic ripples,a two-scale hierarchical two-dimensional array of micro-bumps,and a micro-pits array with *** wettability of the laser-textured Stavax steel surface was converted from its original hydrophilicity into hydrophobicity and even super-hydrophobicity after exposure to *** results clearly show that this super-hydrophobicity is mainly due to the surface *** ultrafast laserinduced catalytic effect may play a secondary role in modifying the surface chemistry so as to lower the surface *** laser-induced surface textures on the metal mold substrates were then replicated onto polypropylene substrates via the polymer injection molding *** surface wettability of the molded polypropylene was found to be changed from the original hydrophilicity to *** developed process holds the potential to improve the performance of fabricated plastic products in terms of wettability control and easy cleaning.

关键词： picosecond laser Surface texturing Stavax steel Polymer Hydrophobicity

Synergistic effect of picosecond optical and nanosecond electrical pulses on dielectric breakdown in aqueous solutions

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Photonics Research 2021年第3期9卷 416-423页

作者： Zachary N.Coker Xiao-Xuan Liang Allen S.Kiester Gary D.Noojin Joel N.Bixler Bennett L.Ibey Alfred Vogel Vladislav V.Yakovlev Department of Physics and Astronomy Texas A&M UniversityCollege StationTexas 77843USA SAIC Ft Sam HoustonTexas 78234USA Institut fur Biomedizinische Optik Universitat zu Lubeck23562 LubeckGermany Air Force Research Laboratory JBSA Fort Sam HoustonTexas 78234USA Department of Biomedical Engineering Texas A&M UniversityCollege StationTexas 77843USA

The combined effect of short(picosecond) optical and(nanosecond) electrical pulses on dielectric breakdown is investigated both theoretically and experimentally. It was demonstrated that nanosecond electrical pulses(nsEPs),being applied simultaneously with picosecond optical pulses, reduce the threshold for optical *** results are discussed with respect to an extended model for opto-electrical-induced *** newly unveiled effect is expected to play a significant role in spatially confined electroporation and further advances in laser-ablation-based processes while also allowing for measurements of ambipolar diffusion constants.

关键词： breakdown optical picosecond

Self-starting mode-locked picosecond Ti：sapphire laser by using of a fast SESAM

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Chinese Physics B 2006年第9期15卷 2022-2024页

作者：朱江峰田金荣王鹏令维军李德华魏志义 Institute of Physics Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Beijing 100080 China

A stable continuous wave mode-locked picosecond Ti：sapphire laser by using a fast semiconductor saturable absorber mirror （SESAM） is demonstrated. The laser delivers pulse width of 20 ps at a central wavelength of 813 nm and a repetition rate of 100 MHz. The maximum output power is 1.34 W with pump power of 7 W which corresponds to an optical^optical conversion efficiency of 19.1%.

关键词： self-starting picosecond SESAM

Ionization behavior and dynamics of picosecond laser filamentation in sapphire

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Opto-Electronic Advances 2019年第8期2卷 9-15页

作者： Amina Lingfei Ji Tianyang Yan Rui Ma Institute of Laser Engineering Beijing University of TechnologyBeijing 100124China Key Laboratory of Trans-scale Laser Manufacturing Technology Ministry of EducationBeijing 100124China.

Currently,laser-induced structural modifications in optical materials have been an active field of *** this paper,we reported structural modifications in the bulk of sapphire due to picosecond(ps)laser filamentation and analyzed the ionization dynamics of the *** simulations uncovered that the high-intensity ps laser pulses generate plasma through multi-photon and avalanche ionizations that leads to the creation of two distinct types of structural changes in the *** experimental bulk modifications consist of a void like structures surrounded by cracks which are followed by a submicrometer filamentary *** increasing laser energy,the length of the damage and filamentary track appeared to *** addition,the transverse diameter of the damage zone increased due to the electron plasma produced by avalanche ionizations,but no increase in the filamentary zone diameter was observed with increasing laser energy.

关键词： structural modifications sapphire picosecond laser filamentation ionization dynamics

Optical tracking of picosecond coherent phonon pulse focusing inside a sub-micron object

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Light(Science & Applications) 2016年第1期5卷 653-659页

作者： Thomas Dehoux Kenichi Ishikawa Paul H Otsuka Motonobu Tomoda Osamu Matsuda Masazumi Fujiwara Shigeki Takeuchi Istvan A Veres Vitalyi E Gusev Oliver B Wright Institut Lumière Matière UMR5306UniversitéLyon 1-CNRSUniversitéde Lyon69622 VilleurbanneFrance Division of Applied Physics Faculty of EngineeringHokkaido UniversitySapporo 060-8628Japan Research Institute for Electronic Science Hokkaido UniversitySapporo 001-0020Japan School of Science and Technology Kwansei Gakuin UniversitySandaHyogo 669-1337Japan Department of Electronic Science and Engineering Kyoto UniversityKyoto 615-8510Japan Research Centre for Non-Destructive Testing GmbH Altenberger Strasse 69A-4040 LinzAustria Laboratoire d'Acoustique de l'Université du MaineLe Mans 72085France

By means of an ultrafast optical technique,we track focused gigahertz coherent phonon pulses in objects down to sub-micron in *** light pulses illuminating the surface of a single metal-coated silica fibre generate longitudinal-phonon wave *** of visible probe light pulses from the fibre surface allows the vibrational modes of the fibre to be detected,and Brillouin optical scattering of partially transmitted light pulses allows the acoustic wavefronts inside the transparent fibre to be continuously *** thereby probe acoustic focusing in the time domain resulting from generation at the curved fibre *** analytical model,supported by three-dimensional simulations,suggests that we have followed the focusing of the acoustic beam down to a~150-nm diameter waist inside the *** work significantly narrows the lateral resolution for focusing of picosecond acoustic pulses,normally limited by the diffraction limit of focused optical pulses to~1μm,and thereby opens up a new range of possibilities including nanoscale acoustic microscopy and nanoscale computed tomography.

关键词： acoustic–optic fibre optical scattering picosecond ultrasonics

Supercontinuum Generationin Normal-dispersion Photonic Crystal Fiber Using picosecond Pulse

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Semiconductor Photonics and Technology 2007年第4期13卷 256-260页

作者： YAO Li HE Li YANG Bo-jun Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 CHN

Studied is the Super-continuum(SC) generation of a normal-dispersion photonic crystal fiber(PCF) using picosecond pulse excitation. In experimental analyses, a 237 nm broadband infrared continuum was generated pumped at 1 550 nm(normal dispersion regime) by 1.6 ps pulses from an erbium-doped fiber laser. In addition, we conduct the numerical analyses of SC based on generalized nonlinear Schr dionger equation. The results have been applied to investigate the dominant physical processes underlie the generation of SC. We conclude that dispersion, self-phase modulation(SPM),four-wave-mixing(FWM) and Raman scattering are determinants of SC generation rather than fission of soliton in normal-dispersion PCF.

关键词： supercontinuum photonic crystal fiber picosecond