Excimer Lasers & Uv Optical Systems
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
High-Power Solid-State Lasers from a Laser Glass Perspective
LLNL-JRNL-464385 High-Power Solid-State Lasers from a Laser Glass Perspective J. H. Campbell, J. S. Hayden, A. J. Marker December 22, 2010 Internationakl Journal of Applied Glass Science Disclaimer This document was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor Lawrence Livermore National Security, LLC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or Lawrence Livermore National Security, LLC. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or Lawrence Livermore National Security, LLC, and shall not be used for advertising or product endorsement purposes. High-Power Solid-State Lasers from a Laser Glass Perspective John H. Campbell, Lawrence Livermore National Laboratory, Livermore, CA Joseph S. Hayden and Alex Marker, Schott North America, Inc., Duryea, PA Abstract Advances in laser glass compositions and manufacturing have enabled a new class of high-energy/high- power (HEHP), petawatt (PW) and high-average-power (HAP) laser systems that are being used for fusion energy ignition demonstration, fundamental physics research and materials processing, respectively. The requirements for these three laser systems are different necessitating different glasses or groups of glasses. -
Saturable Absorber Mirrors for Passive Mode-Locking
Saturable Absorber Mirrors For Passive Mode-locking R. Hohmuth1 3, G. Paunescu2, J. Hein2, C. H. Lange3, W. Richter1 3, 1 Institut fuer Festkoerperphysik, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany, tel: +493641947444, fax: +493641947442, [email protected] 2 Institut fuer Optik und Quantenelektronik, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany 3 BATOP GmbH, Th.-Koerner-Str. 4, 99425 Weimar, Germany Introduction Saturable Absorber Mirror (SAM) Saturable absorber mirrors (SAMs) are inexpensive and schematic laser set-up compact devices for passive mode-locking of diode pumped solid state lasers. Such laser systems can provide ultrashort cavity, length L -cavity with gain medium pulse trains with high repetition rates. Typical values for pulse pulse -high reflective mirror and TRT=2L/c ) t output mirror with partially ( duration ranging from 100 fs up to 10 ps. For instance a I y t transmission i s Nd:YAG laser can be mode-locked with pulse duration of 8 ps n e -saturable absorber as t n and mean output power of 6 W. I modulator On this poster we present results for a Yb: KYW laser passive =>pulse trains spaced by mode-locked by SAMs with three different modulation depths round-trip time TRT=2L/c time t between 0.6% and 2.0%. SAMs were prepared by solid- gain medium high reflective mirror (pumped e.g. output mirror source molecular beam epitaxy with a low-temperature (LT) with saturable absorber by laser diode) (SAM) grown InGaAs absorbing quantum well. LT InGaAs quantum well SAM design SAM reflection spectrum Ta O or SiO / dielectric cover Requirements for passive mode- 25 2 conduction 71.2 nm GaAs / barrier E 7 nm c1 71.2 nm GaAs / barrier locking band Ec LT InGaAs 74.7 nm GaAs The mode-locking regime is stable agaist the onset of quantum well InGaAs 88.4 nm AlAs multiple pulsing as long as the pulse duration is smaller energy : 25x Bragg mirror than t . -
Main Types of Lasers Used for Manufacturing- Key Properties and Key Applications
Main Types of Lasers Used for Manufacturing- Key Properties and Key Applications Tom Kugler Fiber Systems Mgr. Laser Mechanisms, Inc. www.lasermech.com LME 2011 Topics • Laser Output Wavelengths • Laser Average Power • Laser Output Waveforms (Pulsing) • Laser Peak Power • Laser Beam Quality (Focusability) • Key Properties • Key Applications • Beam Delivery Styles 2 Tom Kugler- Laser Mechanisms Compared to standard light sources… • Laser Light is Collimated- the light rays are parallel to and diverge very slowly- they stay concentrated over long distances- that is a “laser beam” • Laser Light has high Power Density- parallel laser light has a power density in watts/cm2 that is over 1000 times that of ordinary incandescent light • Laser Light is Monochromatic- one color (wavelength) so optics are simplified and perform better • Laser light is highly Focusable- low divergence, small diameter beams, and monochromatic light mean the laser can be focused to a small focal point producing power densities at focus 1,000,000,000 times more than ordinary light. 3 Tom Kugler- Laser Mechanisms Laser Light • 100W of laser light focused to a diameter of 100um produces a power density of 1,270,000 Watts per square centimeter! 4 Tom Kugler- Laser Mechanisms Examples of Laser Types • Gas Lasers: Electrical Discharge in a Gas Mixture Excites Laser Action: – Carbon Dioxide (CO2) – Excimer (XeCl, KrF, ArF, XeF) • Light Pumped Solid State Lasers: Light from Lamps or Diodes Excites Ions in a Host Crystal or Glass: – Nd:YAG (Neodymium doped Yttrium Aluminum -
Next Generation High Temperature Superconducting Wires” A
To be published in “Next Generation High Temperature Superconducting Wires” A. Goyal (Ed.), Kluwer Academic/Plenum Publishers PULSED LASER DEPOSITION OF YBa2Cu3O7-δ FOR COATED CONDUCTOR APPLICATIONS: CURRENT STATUS AND COST ISSUES Hans M. Christen Oak Ridge National Laboratory Solid-State Division Oak Ridge, TN 37831-6056 INTRODUCTION Amongst the numerous techniques currently being tested for the fabrication of coated conductors (i.e. high-temperature superconducting oxides deposited onto metallic tapes), pulsed laser deposition (PLD) plays a prominent role. Recent results from groups in the United States (e.g. Los Alamos National Laboratory), Europe (e.g. University of Göttingen), and Japan (e.g. Fujikura Ltd.) are most promising, yielding record numbers for Jc and Ic. As a method for depositing films of complex materials, such as the high-temperature superconductors (HTS) relevant to this chapter, PLD is well established and conceptually simple. Issues that have kept PLD from becoming a successful technique for devices and optical materials, namely particulate formation and thickness non-uniformities, are much less of a concern in the fabrication of HTS tapes. Nevertheless, the approach still presents ongoing challenges in the fundamental understanding of the laser-target interaction and growth from the resulting energetic plasma plume. Numerous issues related to the scale-up, control, reproducibility, and economic feasibility of PLD remain under investigation. It is clearly beyond the scope of this short chapter to give a complete treatise of such a complex subject – fortunately, several excellent reviews have already been published.1-3 It is thus the intent of the author to introduce PLD only briefly and with a strong focus on HTS deposition, summarizing the most important developments and referring the reader to the numerous cited works. -
Femtosecond-Pulsed Laser Deposition of Erbium-Doped Glass Nanoparticles in Polymer Layers for Hybrid Optical Waveguide Amplifiers
Femtosecond-Pulsed Laser Deposition of Erbium-Doped Glass Nanoparticles in Polymer Layers for Hybrid Optical Waveguide Amplifiers. Eric Kumi Barimah*1, Marcin W. Ziarko2, Nikolaos Bamiedakis2, Ian H. White2, Richard V. Penty2, Gin Jose1 School of Chemical and Process Engineering, University of Leeds, Clarendon Road, Leeds LS2 9JT, United Kingdom Centre for Photonic Systems, Department of Engineering, University of Cambridge, 9 JJ Thomson Ave, Cambridge CB3 0FA, United Kingdom *[email protected] Tellurium oxide (TeO2) based glasses are widely used in many applications such as fibre optic, waveguide devices and Raman gain, and are now being considered for use in optical waveguide amplifiers. These materials exhibit excellent transmission in the visible and near IR wavelength range (up to 2.0 µm), low phonon energy, and high rare-earth solubility [1-3]. Siloxane polymer materials on the other hand, have remarkable thermal, mechanical and optical properties and allow the fabrication of low-loss optical waveguides directly on printed circuit boards. In recent years, various low-cost optical backplanes have been demonstrated using this technology [4-7].However, all polymer optical circuits used in such applications are currently passive, requiring therefore amplification of the data signals in the electrical domain to extend the transmission distance beyond their attenuation limit. The combination of the TeO2 and siloxane technologies can enable the formation of low-cost optical waveguide amplifiers that can be deployed in board-level communications. However, there are significant technical challenges associated with the integration of these two dissimilar materials mainly due to the difference in their thermal expansion coefficients. In this paper therefore, we propose a new approach for incorporating erbium (Er3+)-doped tellurium- oxide glass nanoparticles into siloxane polymer thin films using femtosecond pulsed laser deposition (fs-PLD). -
Detection of Lead in Soil with Excimer Laser Fragmentation Fluorescence Spectroscopy (ELFFS)
Detection of Lead in Soil with Excimer Laser Fragmentation Fluorescence Spectroscopy (ELFFS) J. H. Choi1, C. J. Damm2, N. J. O’Donovan1, R. F. Sawyer1, C. P. Koshland2, and D. Lucas3† 1Mechanical Engineering Department, University of California, Berkeley, CA 94720 2Science & Technology Department, Sierra Nevada College, NV 89451 3School of Public Health, University of California, Berkeley, CA 94720 4Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory Berkeley, CA 94720 Date: 2/2/04 † Corresponding Author [email protected] PH: (510) 486-7002 FAX: (510) 486-7303 Index Headings: Photofragmentation; Fluorescence; Photochemistry; Plasma; Lead. 1 ABSTRACT Excimer laser fragmentation fluorescence spectroscopy (ELFFS) is used to monitor lead in soil sample and investigate laser-solid interactions. Pure lead nitrate salt and soil doped with lead nitrate are photolyzed with 193 nm light from an ArF excimer at fluences from 0.4 to 4 J/cm2. Lead emission is observed at 357.2, 364.0, 368.3, 373.9 and 405.8 nm. Time-resolved data show the decay time of the lead emission at 405.8 nm grows with increasing fluence, and a plasma is formed above fluences of 2 J/cm2, where a strong continuum emission interferes with the analyte signal. Fluences below this threshold allow us to achieve a detection limit of approximately 200 ppm in soil. INTRODUCTION Lead (Pb) poisoning from environmental and occupational exposure remains one of the most common and preventable diseases. There are numerous serious and detrimental health effects from inhalation or ingestion of lead, including poisoning or even death in extreme circumstances1. Various in situ, real-time methods to measure heavy metals in soil have been developed as a replacement for conventional wet-chemistry techniques that require laborious and time consuming processes, such as preparation, dissolution, chelation, and ion exchange2,3. -
D'évaluation Des Technologies De La Santé Du Québec
(CETS 2000-2 RE) Report – June 2000 A STATE-OF-KNOWLEDGE UPDATE THE EXCIMER LASER IN OPHTHALMOLOGY: Conseil d’Évaluation des Technologies de la Santé du Québec Report submitted to the Minister of Research, Science And Technology of Québec Conseil d’évaluation des technologies de la santé du Québec Information concerning this report or any other report published by the Conseil d'évaluation des tech- nologies de la santé can be obtained by contacting AÉTMIS. On June 28, 2000 was created the Agence d’évaluation des technologies et des modes d’intervention en santé (AÉTMIS) which took over from the Conseil d’évaluation des technologies de la santé. Agence d’évaluation des technologies et des modes d’intervention en santé 2021, avenue Union, Bureau 1040 Montréal (Québec) H3A 2S9 Telephone: (514) 873-2563 Fax: (514) 873-1369 E-mail: [email protected] Web site address: http://www.aetmis.gouv.qc.ca Legal deposit - Bibliothèque nationale du Québec, 2001 - National Library of Canada ISBN 2-550-37028-7 How to cite this report : Conseil d’évaluation des technologies de la santé du Québec. The excimer laser in ophtalmology: A state- of-knowledge update (CÉTS 2000-2 RE). Montréal: CÉTS, 2000, xi- 103 p Conseil d’évaluation des technologies de la santé du Québec THE EXCIMER LASER IN OPHTHALMOLOGY: A MANDATE STATE-OF-KNOWLEDGE UPDATE To promote and support health technology assessment, In May 1997, the Conseil d’évaluation des technologies de disseminate the results of the assessments and la santé du Québec (CETS) published a report dealing spe- encourage their use in decision making by all cifically with excimer laser photorefractive keratectomy stakeholders involved in the diffusion of these (PRK). -
RAPID COMMUNICATIONS Resonant Infrared Pulsed-Laser Deposition Of
RAPID COMMUNICATIONS This section is reserved for short submissions which contain important new results and are intended for accelerated publication. Resonant infrared pulsed-laser deposition of polymer films using a free-electron laser Daniel M. Bubb,a) J. S. Horwitz, J. H. Callahan, R. A. McGill, E. J. Houser, and D. B. Chrisey Naval Research Laboratory, Washington, DC 20375 M. R. Papantonakis and R. F. Haglund, Jr. Department of Physics and Astronomy and W. M. Keck Foundation Free-Electron Laser Center, Vanderbilt University, Nashville, Tennessee 37235 M. C. Galicia and A. Vertes Department of Chemistry, George Washington University, Washington, DC 20001 ͑Received 12 March 2001; accepted 29 May 2001͒ Thin films of polyethylene glycol ͑MW 1500͒ have been prepared by pulsed-laser deposition ͑PLD͒ using both a tunable infrared ͑ϭ2.9 m, 3.4 m͒ and an ultraviolet laser ͑ϭ193 nm͒.A comparison of the physicochemical properties of the films by means of Fourier transform infrared spectroscopy, electrospray ionization mass spectrometry, and matrix-assisted laser desorption and ionization shows that when the IR laser is tuned to a resonant absorption in the polymer, the IR PLD thin films are identical to the starting material, whereas the UV PLD show significant structural modification. These results are important for several biomedical applications of organic and polymeric thin films. © 2001 American Vacuum Society. ͓DOI: 10.1116/1.1387052͔ I. INTRODUCTION physical characteristics of the bulk PEG material, whereas Polyethylene glycol ͑PEG͒ is a technologically important the UV PLD deposited PEG materials do not. In addition, the polymer with many biomedical applications.1 Examples in- results also show clearly that the mechanism of IR PLD is clude tissue engineering,2 spatial patterning of cells,3,4 drug fundamentally different than UV PLD. -
Redalyc.Synthesis and Characterization of Linio2 Targets
Superficies y vacío ISSN: 1665-3521 [email protected] Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. México López-Iturbe, J.; Camacho-López, M. A.; Escobar-Alarcón, L.; Camps, E. Synthesis and characterization of LiNiO2 targets for thin film deposition by pulsed laser ablation Superficies y vacío, vol. 18, núm. 4, diciembre, 2005, pp. 27-30 Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Distrito Federal, México Available in: http://www.redalyc.org/articulo.oa?id=94218407 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Superficies y Vacío 18(4), 27-30, diciembre de 2005 ©Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales Synthesis and characterization of LiNiO2 targets for thin film deposition by pulsed laser ablation J. López-Iturbe Posgrado en Ciencia de Materiales, Facultad de Química, Universidad Autónoma del Estado de México M.A. Camacho-López Facultad de Química-Universidad Autónoma del Estado de México Paseo Colón y Tollocan, C.P. 50130, Toluca, México L. Escobar-Alarcón, E. Camps Departamento de Física, Instituto Nacional de Investigaciones Nucleare Apartado Postal 18-1027, México DF 11801, México (Recibido: 26 de septiembre de 2005; Aceptado: 31 de octubre de 2005) In order to deposit LiNiO2 thin films by pulsed laser deposition (PLD), a LiNiO2 target was prepared by a solid-state reaction from NiO and Li2O. The effect of the Li2O wt. -
Phase Formation of Manganese Oxide Thin Films Using Pulsed Laser Deposition† Cite This: Mater
Materials Advances View Article Online PAPER View Journal | View Issue Phase formation of manganese oxide thin films using pulsed laser deposition† Cite this: Mater. Adv.,2021, 2,303 Lauren M. Garten, *‡ Praneetha Selvarasu, § John Perkins,¶ David Ginley and Andriy Zakutayev * Manganese oxides have enabled a wide range of technologies including oxygen evolution catalysts, lithium ion batteries, and thermochemical water splitting. However, the variable oxidation state and rich polymorphism of manganese oxides make it difficult to find the processing conditions to target a particular phase of manganese oxide. Targeted synthesis requires a more complete understanding of the phase space and the impact of multiple processing variables on phase formation. Here, we demonstrate the impact of substrate temperature, total deposition pressure, partial pressure of oxygen, and target composition on the phase formation of manganese oxides grown using combinatorial pulsed laser deposition (PLD). Thin films were deposited from a MnO, Mn2O3 or MnO2 target onto amorphous glass Creative Commons Attribution 3.0 Unported Licence. substrates with a continuously varied temperature provided by a combinatorial heater. A combination of X-ray diffraction, Rutherford backscattering spectroscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies were used to determine the phases present in the samples. The oxygen partial pressure was found to be the critical factor determining phase formation, while the total pressure, target composition, and substrate temperature have smaller and more complex effects on phase formation. Received 15th June 2020, Comparing the results of this work to the published temperature–pressure phase diagrams shows that Accepted 20th October 2020 the PLD thin films vary significantly from the expected equilibrium phases of either the bulk materials DOI: 10.1039/d0ma00417k or nanoparticles. -
By Pulsed Laser Deposition
Western Kentucky University TopSCHOLAR® Masters Theses & Specialist Projects Graduate School Spring 2020 Morphology and Structure of Pb Thin Films Grown On Si (111) by Pulsed Laser Deposition Bektur Abdisatarov Western Kentucky University, [email protected] Follow this and additional works at: https://digitalcommons.wku.edu/theses Part of the Engineering Science and Materials Commons, Physical Sciences and Mathematics Commons, and the Semiconductor and Optical Materials Commons Recommended Citation Abdisatarov, Bektur, "Morphology and Structure of Pb Thin Films Grown On Si (111) by Pulsed Laser Deposition" (2020). Masters Theses & Specialist Projects. Paper 3178. https://digitalcommons.wku.edu/theses/3178 This Thesis is brought to you for free and open access by TopSCHOLAR®. It has been accepted for inclusion in Masters Theses & Specialist Projects by an authorized administrator of TopSCHOLAR®. For more information, please contact [email protected]. MORPHOLOGY AND STRUCTURE OF PB THIN FILMS GROWN ON SI (111) BY PULSED LASER DEPOSITION A Thesis Presented to The Department of Physics and Astronomy Western Kentucky University Bowling Green, Kentucky In Partial Fulfillment Of the Requirements for the Degree Master of Science By Bektur Abdisatarov May 2020 Digitally signed by Cheryl D Davis Cheryl D Davis Date: 2020.05.12 08:54:22 -05'00' It would be an honor to dedicate this thesis to my family and friends. I have a unique feeling of gratitude and appreciation for my loving mother, Raikhan, for her encouragement and inspiring words that have motivated me to become a master of science. My sisters Aizat and Aiperi and my brother Bekzat gave me faith, and they were my source of strength when I was weak. -
Arxiv:1911.10820V2 [Physics.Optics] 18 Dec 2019
Hybrid integrated semiconductor lasers with silicon nitride feedback circuits Klaus-J. Boller1,3,*, Albert van Rees1, Youwen Fan1,2, Jesse Mak1, Rob E.M. Lammerink1, Cornelis A.A. Franken1, Peter J.M. van der Slot1, David A.I. Marpaung1, Carsten Fallnich3,1, J¨ornP. Epping2, Ruud M. Oldenbeuving2, Dimitri Geskus2, Ronald Dekker2, Ilka Visscher2, Robert Grootjans2, Chris G.H. Roeloffzen2, Marcel Hoekman2, Edwin J. Klein2, Arne Leinse2, and Ren´eG. Heideman2 1Laser Physics and Nonlinear Optics, Mesa+ Institute for Nanotechnology, Department for Science and Technology, Applied Nanophotonics, University of Twente, Enschede, The Netherlands 2LioniX International BV, Enschede, The Netherlands 3University of M¨unster,Institute of Applied Physics, Germany *Corresponding author: [email protected] December 19, 2019 Abstract Hybrid integrated semiconductor laser sources offering extremely narrow spectral linewidth as well as compati- bility for embedding into integrated photonic circuits are of high importance for a wide range of applications. We present an overview on our recently developed hybrid-integrated diode lasers with feedback from low-loss silicon nitride (Si3N4 in SiO2) circuits, to provide sub-100-Hz-level intrinsic linewidths, up to 120 nm spectral coverage around 1.55 µm wavelength, and an output power above 100 mW. We show dual-wavelength operation, dual-gain operation, laser frequency comb generation, and present work towards realizing a visible-light hybrid integrated diode laser. 1 Introduction The extreme coherence of light generated with lasers has been the key to great progress in science, for instance in testing natures fundamental symmetries [1, 2], properties of matter [3, 4], or for the detection of gravitational waves [5].