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不同组分的钒酸盐混晶Ybt：YxGd1-t-xVO4光谱与激光性质的比较研究

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物理学报 2011年第1期60卷 290-298页

作者：刘均海韩文婿张怀金王继扬 xavier mateos Valentin Petrov 青岛大学物理科学学院青岛266071 山东大学晶体材料国家重点实验室济南250100 Fisica i Cristal·lografia de Materials Universitat Rovira i Virgili C/Marcel. li Domingo s/n E43007 Tarragona Spain Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy 2A Max-Born-Str. D-12489 Berlin Germany

研究了三种掺Yb钒酸盐混晶Yb0.005:Y0.298Gd0.697VO4,Yb0.007:Y0.407Gd0.586VO4和Yb0.009:Y0.575Gd0.416VO4的室温偏振吸收谱和发射谱.结果表明,最强的吸收和发射相应于π偏振,位于波长985nm;随组分不同,最大吸收截面σabs=4.8—8.5×10-20cm2,吸收带宽9.5—9.9nm;最大受激发射截面σem=5.8—10.3×10-20cm2.利用高亮度半导体激光器纵向抽运实现了室温下的连续波激光运转.研究发现,不同混晶的激光振荡行为存在很大差异:在谐振腔输出耦合透过率T=2%条件下,Yb0.005:Y0.298Gd0.697VO4和Yb0.009:Y0.575Gd0.416VO4的激光振荡随抽运功率降低而出现σ,π偏振态的共存和转变;而Yb0.007:Y0.407Gd0.586VO4的激光振荡则保持π偏振态不变.在T=5%情形,Yb0.009:Y0.575Gd0.416VO4的激光振荡为单纯的σ偏振;而Yb0.005:Y0.298Gd0.697VO4所产生的激光振荡随抽运功率下降仍出现类似的偏振态变化行为.

关键词：掺Yb钒酸盐混晶吸收谱和发射谱激光振荡偏振态

单斜结构的Yb：KLu(WO4)2晶体光谱和激光性质的各向异性

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物理学报 2009年第1期58卷 278-284页

作者：万勇韩文娟刘均海夏临华 xavier mateos Valentin Petrov 张怀金王继扬青岛大学物理科学学院青岛266071 Fisica i Cristal·lografia de Materials Universitat Rovira i VirgiliC/Marcel.li Domingos/nE-43007 TarragonaSpain Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy 2A Max-Born-Str.D-12489 BerlinGermany 山东大学晶体材料国家重点实验室济南250100

研究了Yb:KLu(WO4)2晶体对非偏振抽运光的吸收以及连续波激光振荡性质.晶体结构的低对称性导致晶体光谱呈强烈各向异性,最强的吸收和发射都发生在平行于Nm主轴的偏振方向上.Ng切向晶体具有最高的非偏振抽运光吸收效率和最大的激光功率... 详细信息

研究了Yb:KLu(WO4)2晶体对非偏振抽运光的吸收以及连续波激光振荡性质.晶体结构的低对称性导致晶体光谱呈强烈各向异性,最强的吸收和发射都发生在平行于Nm主轴的偏振方向上.Ng切向晶体具有最高的非偏振抽运光吸收效率和最大的激光功率产生潜力,2mm长的晶体产生的最高连续波输出功率为11W,相对于吸收抽运功率,光—光转换效率为68%,而斜率效率则达80%.

关键词：吸收谱发射谱激光振荡各向异性

Multi-gigahertz mode-locked femtosecond Yb:KLuW waveguide lasers

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Photonics Research 2022年第11期10卷 2584-2589页

作者： JI EUN BAE xavier mateos MAGDALENA AGUILÓ FRANCESC DÍAZ JAVIER GARCÍA AJATES CAROLINA ROMERO JAVIER RODRÍGUEZ VÁZQUEZ DE ALDANA FABIAN ROTERMUND Department of Physics Korea Advanced Institute of Science and Technology(KAIST)34141 DaejeonRepublic of Korea Universitat Rovira i Virgili(URV) Fı´sica i Cristal·lografia de Materials i Nanomaterials(FiCMA)43007 TarragonaSpain Grupo de Investigación en Aplicaciones del Láser y Fotónica University of Salamanca37008 SalamancaSpain

We demonstrate multi-gigahertz continuous-wave mode-locking of a Yb:KLuW waveguide laser. A femtosecondlaser-inscribed Yb:KLuW channel waveguide in an extended laser cavity delivers a fundamentally mode-locked laser near 1030 nm. A tunable few-centimeter-long cavity containing a single-walled carbon nanotube saturable absorber as mode-locker generates self-starting femtosecond pulses with average output powers exceeding210 mW at repetition rates of 2.27, 2.69, and 3.55 GHz. The laser cavity, which includes a wedged waveguide,is extended by using a lens pair that controls the laser fluence on the saturable absorber for reliable mode-locked operation without instability. The presented laser performance, mode-locked up to 3.55 GHz, highly suggests the potential of crystalline Yb:KLuW waveguides for realizing high-power ultrafast lasers with higher GHz repetition rates in a quasi-monolithic cavity.

关键词： waveguide femtosecond mode

Passively Q-switched femtosecond-laser-written thulium waveguide laser based on evanescent field interaction with carbon nanotubes

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Photonics Research 2018年第10期6卷 971-980页

作者： ESROM KIFLE PAVEL LOIKO JAVIER RODRíGUEZ VáZQUEZ DE ALDANA CAROLINA ROMERO AIRáN RóDENAS SUN YUNG CHOI JI EUN BAE FABIAN ROTERMUND VIKTOR ZAKHAROV ANDREY VENIAMINOV MAGDALENA AGUILó FRANCESC DíAZ UWE GRIEBNER VALENTIN PETROV xavier mateos Universitat Rovira i Virgili Departament Quimica Fisica i Inorgànica Fisica i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS Campus Sescelades E-43007 Tarragona Spain ITMO University 49 Kronverkskiy pr. 197101 St. Petersburg Russia Aplicaciones del Láser y Fotónica University of Salamanca 37008 Salamanca Spain Istituto di Fotonica e Nanotecnologie Consiglio Nazionale delle Ricerche (IFN-CNR) Piazza Leonardo da Vinci 32 20133 Milano Italy Department of Physics KAIST 291 Daehak-ro Yuseong-gu 34141 Daejeon South Korea Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Bom-Str. 2a D-12489 Berlin Germany

Surface channel waveguides(WGs) were fabricated in a monoclinic Tm^(3+):KLu(WO_4)_2 crystal by femtosecond direct laser writing(fs-DLW). The WGs consisted of a half-ring cladding with diameters of 50 and 60 μm located just beneath the crystal surface. They were characterized by confocal laser microscopy and μ-Raman spectroscopy,indicating a reduced crystallinity and stress-induced birefringence of the WG cladding. In continuous-wave(CW)mode, under Ti:sapphire laser pumping at 802 nm, the maximum output power reached 171.1 mW at 1847.4 nm,corresponding to a slope efficiency η of 37.8% for the 60 μm diameter WG. The WG propagation loss was0.7 0.3 d B∕cm. The top surface of the WGs was spin-coated by a polymethyl methacrylate film containing randomly oriented(spaghetti-like) arc-discharge single-walled carbon nanotubes serving as a saturable absorber based on evanescent field coupling. Stable passively Q-switched(PQS) operation was achieved. The PQS60 μm diameter WG laser generated a record output power of 150 m W at 1846.8 nm with η = 34.6%. The conversion efficiency with respect to the CW mode was 87.6%. The best pulse characteristics(energy/duration)were 105.6 nJ/98 ns at a repetition rate of 1.42 MHz.

关键词：激光技术波导技术发展现状通讯技术

Structured laser beams: toward 2-μm femtosecond laser vortices

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Photonics Research 2021年第7期9卷 357-363页

作者： Yongguang Zhao Li Wang Weidong Chen Pavel Loiko xavier mateos Xiaodong Xu Ying Liu Deyuan Shen Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Max Born Institute for Nonlinear Optics and Short Pulse SpectroscofDy 12489 BerlinGermany Centre de Recherche sur les Ions les Materiaux et la Photonique(CIMAP)UMR 6252 CEA-CNRS-ENSICAENUniversite de CaenCaen 14050France Universitat Rovira i Virgin(URV) Fisica i Cristal lografia de Materials i Nanomaterials(FiCMA-FiCNA)Marcel.li Domingo 143007 TarragonaSpain State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China

Structured ultrashort-pulse laser beams, and in particular eigenmodes of the paraxial Helmholtz equation, are currently extensively studied for novel potential applications in various fields, e.g., laser plasma acceleration,attosecond science, and fine micromachining. To extend these prospects further, in the present work we push forward the advancement of such femtosecond structured laser sources into the 2-μm spectral region. Ultrashortpulse Hermite– and Laguerre–Gaussian laser modes both with a pulse duration around 100 fs are successfully produced from a compact solid-state laser in combination with a simple single-cylindrical-lens converter. The negligible beam astigmatism, the broad optical spectra, and the almost chirp-free pulses emphasize the high reliability of this laser source. This work, as a proof of principle study, paves the way toward few-cycle pulse generation of optical vortices at 2 μm. The presented light source can enable new research in the fields of interaction with organic materials, next generation optical detection, and optical vortex infrared supercontinuum.

关键词： laser cylindrical acceleration

35 W continuous-wave Ho:YAG single-crystal fiber laser

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High Power Laser Science and Engineering 2020年第2期8卷 161-165页

作者： Yongguang Zhao Li Wang Weidong Chen Jianlei Wang Qingsong Song Xiaodong Xu Ying Liu Deyuan Shen Jun Xu xavier mateos Pavel Loiko Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Born-Str.2aD-12489 BerlinGermany Jiangsu Key Laboratory of Advanced Laser Materials and Devices Jiangsu Normal UniversityXuzhou 221116China School of Physics Science and Engineering Institute for Advanced StudyTongji UniversityShanghai 200092China Departament Química Física i Inorganica Física i Cristal.lografia de Materials i Nanomaterials(FiCMA-FiCNA)-EMaSUniversitat Rovira i VirgiliCampus SesceladesE-43007 TarragonaSpain Centre de Recherche sur les Ions les Materiaux et la Photonique(CIMAP)UMR 6252 CEA-CNRS-ENSICAENUniversitéde Caen6 Boulevard du Marechal Juin14050 Caen Cedex 4Francé State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China

We report on a high-power Ho:YAG single-crystal fiber(SCF)laser inband pumped by a high-brightness Tm-fiber laser at 1908 *** Ho:YAG SCF grown by the micro-pulling-down technique exhibits a propagation loss of 0.05±0.005 cm^-1 at 2.09μm.A continuous-wave output power of 35.2 W is achieved with a slope efficiency of 42.7%,which is to the best of our knowledge the highest power ever reported from an SCF-based laser in the 2µm spectral range.

关键词： high-power laser Ho:YAG mid-IR laser single-crystal fiber

Power-scalable sub-100-fs Tm laser at 2.08μm

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High Power Laser Science and Engineering 2021年第4期9卷 41-45页

作者： Li Wang Weidong Chen Yongguang Zhao Hanlin Yang Wei Jing Zhongben Pan Hui Huang Jiachen Liu Ji Eun Bae Fabian Rotermund Pavel Loiko xavier mateos Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy 12489 BerlinGermany Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Advanced Ceramics and Mechanical Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Department of Physics Korea Advanced Institute of Science and Technology(KAIST)34141 DaejeonRepublic of Korea Centre de Recherche sur les Ions les Matériaux et la Photonique(CIMAP)UMR 6252 CEA-CNRS-ENSICAENUniversitéde Caen14050 Caen Cedex 4France Física i Cristal·lografia de Materials i Nanomaterials(FiCMA-FiCNA) Universitat Rovira i Virgili(URV)43007 TarragonaSpain State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China

We report on a power-scalable sub-100-fs laser in the 2-μm spectral range using a Tm;-doped‘mixed’(Lu,Sc);O;sesquioxide ceramic as an active *** as short as 58 fs at 2076 nm with an average output power of 114 mW at a pulse repetition rate of approximately 82.9 MHz are generated by employing single-walled carbon nanotubes as a saturable absorber.A higher average power of 350 m W at 2075 nm is obtained at the expense of the pulse duration(65 fs).A maximum average power of 486 mW is achieved for a pulse duration of 98 fs and an optical conversion efficiency of 22.3%,representing the highest value ever reported from sub-100-fs mode-locked Tm lasers.

关键词： 2-μm mode-locked laser single-walled carbon nanotubes Tm:(Lu Sc)_(2)O_(3)

Generation of 84-fs pulses from a mode-locked Tm：CNNGG disordered garnet crystal laser

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Photonics Research 2018年第8期6卷 800-804页

作者： ZHONGBEN PAN YICHENG WANG YONGGUANG ZHAO HUALEI YUAN XIAOJUN DAI HUAQIANG CAI JI EUN BAE SUN YOUNG CHOI FABIAN ROTERMUND xavier mateos JOSEP MARIA SERRES PAVEL LOIKO UWE GRIEBNER VALENTIN PETROV Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Bom-Str. 2a D-12489 Berlin Germany Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 China Jiangsu Key Laboratory of Advanced Laser Materials and Devices Jiangsu Normal University Xuzhou 221116 China Department of Physics Korea Advanced Institute of Science and Technology (KAIST) 34141 Daejeon South Korea Fisica i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS Departament de Quimica Fisica i Inorganica Universitat Rovira i Virgili (URV) Campus Sescelades E-43007 Tarragona Spain ITMO University 49 Kronverkskiy Pr. 197101 St. Petersburg Russia

A mode-locked laser based on a Tm:CNNGG disordered crystal as an active medium and a single-walled carbon nanotube saturable absorber is demonstrated, operating at a central wavelength of 2018 nm. Transformlimited 84 fs pulses are generated with an average output power of 22 mW at a repetition rate of ~90 MHz.A maximum output power of 98 mW is obtained at a slightly longer pulse duration of 114 fs.

关键词：无序晶体纳米管通讯技术发展现状

Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

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Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： Carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek xavier Monforte Johannes C.Heinzel Antal Nógrádi Andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian Cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University Clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGCs). However, the use of tNGCs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGC would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGCs and compared the various features of these improved silk^(+) tNGCs with the tubes without holes(silk^(–) tNGCs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGCs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGCs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGCs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGCs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization