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Q-switching of waveguide lasers based on graphene/WS_2 van der Waals heterostructure

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Photonics research 2017年第5期5卷 406-410页

作者： ZIQI LI CHEN CHENG NINGNING DONG CArOLINA rOMErO QINGMING LU JUN WANG javier rODríGUEZ vázquez de aldana YANG TAN FENG CHEN School of Physics State Key Laboratory of Crystal Materials Shandong University Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Laser Microprocessing Group Facultad Ciencias Universidad de Salamanca School of Chemistry and Chemical Engineering Shandong University

We report on the operation of passively Q-switched waveguide lasers at 1 μm wavelength based on a graphene∕WS_2 heterostructure as a saturable absorber(SA). The gain medium is a crystalline Nd:YvO_4 cladding waveguide produced by femtosecond laser writing. The nanosecond waveguide laser operation at 1064 nm has been realized with the maximum average output power of 275 m W and slope efficiency of 37%. In comparison with the systems based on single WS_2 or graphene SA, the lasing Q-switched by a graphene∕WS_2 heterostructure SA possesses advantages of a higher pulse energy and enhanced slope efficiency, indicating the promisingapplications of van der Waals heterostructures for ultrafast photonic devices.

关键词： WS Q-switching of waveguide lasers based on graphene/WS2 van der Waals heterostructure der

Model of Mediating determinants of Time Differences in INDYCAr

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Journalism and Mass Communication 2024年第4期14卷 232-240页

作者： Wilfrido Isidro aldana Balderas Héctor Daniel Molina ruiz Enrique Martínez Muñoz Eleazar.villegas González Tirso javier Hernández Gracia Arturo Sánchez Sánchez Cruz García Lirios Alfredo Barrera Escobar University of México HuehuetocaMèxico University of Hidalgo PachucaMèxico University of Tlaxcala Mèxico University of CDMX Mexico University of Fv Mexico

The IndyCar series distinguishes itself by pr.viding the same design and operation of the single-seater to its *** difference in times is then attributable to the skills of the dr.vers,but considering the data from the races could test this *** objective of this work was to establish a trajectory model to predict race times.A cross-sectional,correlational,and explanatory work was carried out with a sample of 18,474 records in the period from 2020 to 2023 of the IndyCar *** results show that the time span predicts the time *** relation to the studies of acceptance of the technology,the adjustment of this to human capacities to explain the time differences in the series of racing cars is discussed.

关键词： time differences ranking differences ranking race time laps completed

Mid-infrared waveguiding in three-dimensional microstructured optical waveguides fabricated by femtosecond-laser writing and phosphoric acid etching

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Photonics research 2020年第3期8卷 257-262页

作者： JINMAN Lv BINBIN HONG YANG TAN FENG CHEN javier rODríGUEZ vázquez de aldana GUO PING WANG Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518052China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China departamento Fisica Aplicada Facultad CienciasUniversidad de SalamancaSalamanca 37008Spain

We fabricated a three-dimensional microstructured optical waveguide(MOW)in a single-crystal using femtosecond-laser writing and phosphoric acid etching techniques,and observed excellent midinfrared waveguiding performance with low loss of^0.5 d B∕*** with a periodic arrangement were written inside the yttrium aluminum garnet(YAG)crystal via femtosecond laser inscription,and then etched by the phosphoric acid(H3 PO4)to form hollow *** evolution of the microstructure of tracks was investigated in *** function of the MOW was analyzed by different numerical methods,indicating the proposed MOW can effectively operate in quasi-single-mode pattern in the midinfrared wavelength range,which agrees well with our experiment results.

关键词： microstructure laser wave

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 r.vira 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 ZAKHAr.v ANDrEY vENIAMINOv MAGDALENA AGUILó FrANCESC DíAZ UWE GrIEBNEr.vALENTIN PETr.v XAvIEr MATEOS Universitat r.vira 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

Intracavity biosensor based on the Nd:YAG waveguide laser: tumor cells and dextrose solutions

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Photonics research 2017年第6期5卷 247-251页

作者： GUANHUA LI HUIYUAN LI rUMEI GONG YANG TAN javier rODríGUEZ vázquez de aldana YUPING SUN FENG CHEN department of respiration Jinan Central Hospital Affiliated to Shandong University department of Ophthalmology Jinan Central Hospital Affiliated to Shandong University department of Oncology Jinan Central Hospital Affiliated to Shandong University School of Physics State Key Laboratory of Crystal Materials Shandong University departamento Física Aplicada Facultad Ciencias Universidad de Salamanca

This work demonstrates the Nd:YAG waveguide laser as an efficient platform for the bio-sensing of dextrose solutions and tumor cells. The waveguide was fabricated in an Nd:YAG crystal with the cooperation of ultrafast laser writing and ion irradiation. The laser oscillation in the Nd:YAG waveguide is ultrasensitive to the external environment of the waveguide. Even a weak disturbance leads to a large variation of the output power of the *** to this feature, an Nd:YAG waveguide coated with graphene and WSe_2 layers is used as substrate for the microfluidic channel. When the microflow crosses the Nd:YAG waveguide, the laser oscillation in the waveguide is disturbed and induces fluctuation of the output laser. According to the fluctuation, the microflow is detected with a sensitivity of 10 mW/rIU.

关键词： YAG Intracavity biosensor based on the Nd:YAG waveguide laser tumor cells and dextrose solutions Nd

Gastrointestinal manifestations of systemic sclerosis:An updated r.view

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World Journal of Clinical Cases 2021年第22期9卷 6201-6217页

作者： Adan Luquez-Mindiola Alexis javier Atuesta Andres Jose Gómez-aldana department of Gastroenterology Gut MédicaBogota 11711 Colombia department of Internal Medicine Universidad Nacional de ColombiaBogota 11711Colombia department of Endoscopy Santa Fe Foundation of Bogotá(Fundación Santa Fe de Bogotá)Bogotá11711Colombia Faculty of Medicine Universidad de los AndesBogota 11711Colombia

Systemic sclerosis is an autoimmune disease characterized by vascular disease,fibrosis of the skin,and internal organ *** involvement is the most frequent complication of internal organs,impacting up to 90%of *** involvement can affect any region of the gastrointestinal tract from the mouth to the anus,with a predominance of disorders being observed at the level of the upper digestive *** gastrointestinal involvement primarily involves the esophagus,small bowel,and *** severity of gastrointestinal involvement affects quality of life and is a marker of worse prognosis and mortality in these *** this r.view,we describe the current findings regarding gastrointestinal involvement by this entity.

关键词： Systemic sclerosis Gastrointestinal Diagnosis Treatment