Trepo - Selaus asiasanan mukaan "114"

Viitteet 1-20 / 1227

    • 1-Hexene Ozonolysis across Atmospheric and Combustion Temperatures via Synchrotron-Based Photoelectron Spectroscopy and Chemical Ionization Mass Spectrometry 

      Smith Lewin, Caroline; Kumar, Avinash; Herbinet, Olivier; Arnoux, Philippe; Asgher, Rabbia; Barua, Shawon; Battin-Leclerc, Frédérique; Farhoudian, Sana; Garcia, Gustavo A.; Tran, Luc Sy; Vanhove, Guillaume; Nahon, Laurent; Rissanen, Matti; Bourgalais, Jérémy (11.07.2024)
      article
      This study investigates the complex interaction between ozone and the autoxidation of 1-hexene over a wide temperature range (300-800 K), overlapping atmospheric and combustion regimes. It is found that atmospheric molecular ...

    • 1.4 µm continuous-wave diamond Raman laser 

      Casula, Riccardo; Penttinen, Jussi-Pekka; Kemp, Alan J.; Guina, Mircea; Hastie, Jennifer E. (11.12.2017)
      article
      The longest wavelength (~1.4 µm) emitted by a diamond Raman laser pumped by a semiconductor disk laser (SDL) is reported. The output power of the intracavity-pumped Raman laser reached a maximum of 2.3 W with an optical ...

    • 100 W coherently combined picosecond optical vortices 

      Fathi, Hossein; Barros, Rafael; Gumenyuk, Regina
      Conference on lasers & electro-optics Europe & international quantum electronics conference (2025)
      abstract
      Optical vortices (OVs), spiral-shaped light beams carrying orbital angular momentum (OAM), have gained significant attention and widespread applications since their introduction in 1989 [1]. OVs, characterized by a helical ...

    • 1180 nm GaInNAs quantum well based high power DBR laser diodes 

      Viheriälä, Jukka; Aho, Antti; Virtanen, Heikki; Koskinen, Mervi; Dumitrescu, Mihail; Guina, Mircea
      Proceedings of SPIE (24.02.2017)
      conference
      We report state-of-the-art results for 1180nm (narrow linewidth) laser diodes based on GaInNAs quantum wells and show results for ridge waveguide DBR laser diode including its reliability tests. Manuscript demonstrates 500 ...

    • 1337 nm Emission of a Nd3+-Doped TZA Glass Random Laser 

      Dipold, Jessica; Bordon, Camila D. S.; Magalhaes, Evellyn S.; Kassab, Luciana R. P.; Jimenez-Villar, Ernesto; Wetter, Niklaus U. (07 / 2023)
      article

    • 1700 nm dispersion managed mode-locked bismuth fiber laser 

      Noronen, Teppo; Firstov, Sergei; Dianov, Evgeny; Okhotnikov, Oleg G. (21.04.2016)
      article
      <p>We demonstrate the first 1.7 μm bismuth-doped fiber laser generating ultrashort pulses via passive mode-locking. Pulse operation has been achieved for both anomalous and normal dispersion of the laser cavity owing ...

    • 2-μm 1.5-W Optically Pumped Semiconductor Membrane Laser 

      Schuchter, Maximilian C.; Huwyler, Nicolas; Golling, Matthias; Gaulke, Marco; Keller, Ursula (15.04.2024)
      article
      We introduce the first diode-pumped GaSb-based semiconductor membrane laser with a continuous wave (cw) output power of 1.5 W at a center wavelength of 2.08μm with an optical-to-optical efficiency of 11.7% and thermal ...

    • 31% European InGaP/GaAs/InGaNAs Solar Cells For Space Application 

      Campesato, Roberta; Tukiainen, Antti; Aho, Arto; Gori, Gabriele; Isoaho, Riku; Greco, Erminio; Guina, Mircea
      E3S Web of Conferences (2017)
      conference
      We report a triple junction InGaP/GaAs/InGaNAs solar cell with efficiency of ~31% at AM0, 25 °C fabricated using a combined molecular beam epitaxy (MBE) and metal-organic chemical vapour deposition (MOCVD) processes. The ...

    • 33 W continuous output power semiconductor disk laser emitting at 1275 nm 

      Leinonen, Tomi; Iakovlev, Vladimir; Sirbu, Alexei; Kapon, Eli; Guina, Mircea (20.03.2017)
      article
      <p>We demonstrate a semiconductor disk laser emitting at 1275nm, employing a wafer fused AlInGaAs/InP-AlAs/GaAs gain mirror. A built-in Au-reflector was used to reflect the pump light not absorbed in a single pass ...

    • 50 Years of Fiber Solitons 

      Dudley, John M.; Finot, Christophe; Genty, Goëry; Taylor, Roy (2023)
      article
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    • 550 W picoseconds pulsed compact laser system based on a Yb-doped spun tapered double-clad fiber 

      Fathi, Hossein; Motorin, Evgenii; Lindner, Florian; Grishchenko, Andrey; Gribanov, Evgenii; Wondraczek, Katrin; Gumenyuk, Regina; Filippov, Valery
      Proceedings of SPIE - The International Society for Optical Engineering (2024)
      conference
      We demonstrate the dramatic progress in Yb-doped spun tapered double-clad fiber amplifiers delivering up to 550 W of average power with single mode spatial profile and 50 ps pulses at 20 MHz repetition rate. The special ...

    • Ab initio study of the energy level alignment at semiconductor/organic interface: Coadsorption of acceptor and donor ligands with organic dyes 

      Golovanov, Viacheslav; Golovanova, Viktoria; Nazarchuk, Bohdan; Rantala, Tapio T. (15.04.2023)
      article
      <p>Conditions for ab initio evaluation of the surface band alignment in slab models are critically reviewed. Based on the employed approach, we study the relative energy levels arrangement between aromatic dye and ...

    • Accounting for effects of coagulation and model uncertainties in particle number concentration estimates based on measurements from sampling lines - a Bayesian inversion approach with SLIC v1.0 

      Niskanen, Matti; Seppänen, Aku; Oikarinen, Henri; Olin, Miska; Karjalainen, Panu; Mikkonen, Santtu; Lehtinen, Kari (21.05.2025)
      article
      The particle number (PN) emissions of both light- and heavy-duty vehicles are nowadays regulated and are typically measured from a full dilution tunnel with constant volume sampling (CVS). PN measurements for research and ...

    • Achieving a slippery, liquid-infused porous surface with anti-icing properties by direct deposition of flame synthesized aerosol nanoparticles on a thermally fragile substrate 

      Juuti, Paxton; Haapanen, Janne; Stenroos, Christian; Niemelä-Anttonen, Henna; Harra, Juha; Koivuluoto, Heli; Teisala, Hannu; Lahti, Johanna; Tuominen, Mikko; Kuusipalo, Jurkka; Vuoristo, Petri; Mäkelä, Jyrki M. (04 / 2017)
      article
      Slippery, liquid-infused porous surfaces offer a promising route for producing omniphobic and anti-icing surfaces. Typically, these surfaces are made as a coating with expensive and time consuming assembly methods or with ...

    • Active control of dielectric singularities in indium-tin-oxides hyperbolic metamaterials 

      Pianelli, Alessandro; Caligiuri, Vincenzo; Dudek, Michał; Kowerdziej, Rafał; Chodorow, Urszula; Sielezin, Karol; De Luca, Antonio; Caputo, Roberto; Parka, Janusz (2022)
      article
      Dielectric singularities (DSs) constitute one of the most exotic features occurring in the effective permittivity of artificial multilayers called hyperbolic metamaterials (HMMs). Associated to DSs, a rich phenomenology ...

    • Active tapered double-clad fiber with low birefringence 

      Fedotov, Andrei; Ustimchik, Vasilii; Rissanen, Joona; Kolosovskii, Alexander; Voloshin, Victor; Vorob’ev, Igor; Gumenyuk, Regina; Chamorovskiy, Yuri; Filippov, Valery (24.05.2021)
      article
      We addressed the problem of a state of polarization (SOP) drift caused by heating under intense clad pumping in different types of active tapered double-clad fibers. We investigated experimentally the variations of the SOP ...

    • Adaptive law-based feature representation for time series classification 

      Kurbucz, Marcell T.; Hajós, Balázs; Halmos, Balázs P.; Molnár, Vince; Jakovác, Antal (2025)
      article
      Time series classification (TSC) underpins applications across finance, healthcare, and environmental monitoring, yet real-world series often contain noise, local misalignment, and multiscale patterns. We introduce adaptive ...

    • Added Value of Vaisala AQT530 Sensors as a Part of a Sensor Network for Comprehensive Air Quality Monitoring 

      Petäjä, Tuukka; Ovaska, Aino; Fung, Pak Lun; Poutanen, Pyry; Yli-Ojanperä, Jaakko; Suikkola, Jari; Laakso, Mikko; Mäkelä, Taneli; Niemi, Jarkko V.; Keskinen, Jorma; Järvinen, Anssi; Kuula, Joel; Kurppa, Mona; Hussein, Tareq; Tarkoma, Sasu; Kulmala, Markku; Karppinen, Ari; Manninen, Hanna E.; Timonen, Hilkka (2021)
      article
      Poor air quality influences the quality of life in the urban environment. The regulatory observation stations provide the backbone for the city administration to monitor urban air quality. Recently a suite of cost-effective ...

    • Addition of Ag2O in Er3+doped oxyfluorophosphate glass to allow the drawing of optical fibers 

      Shestopalova, I.; Korri, J.; Lemiere, A.; Närhi, M.; Gumenyuk, R.; Boussard-Plédel, C.; Troles, J.; Petit, L. (15.12.2023)
      article
      Here, Ag2O containing glasses in the NaPO3–CaF2 glass network were prepared using standard melting process. The addition of Ag2O was found to increase the thermal stability of the glass due to the decrease in the Q2 units ...

    • Advanced grid concept with external busbars applied on III‒V multijunction solar cells 

      Raappana, Marianna; Kajas, Ninja; Aho, Arto; Polojärvi, Ville; Aho, Timo; Isoaho, Riku; Tukiainen, Antti; Guina, Mircea
      Conference record of the IEEE Photovoltaic Specialists Conference (05.01.2021)
      conference
      We report on the development of an advanced front contact grid design applied on GaInP/GaAs/GaInNAsSb solar cells. Unlike in a conventional grid pattern, the busbars are placed outside the active area of the solar cell. ...