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Advanced Optical Technologies

Editor-in-Chief: Pfeffer, Michael


CiteScore 2018: 1.42

SCImago Journal Rank (SJR) 2018: 0.499
Source Normalized Impact per Paper (SNIP) 2018: 1.346

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Volume 1, Issue 5

Issues

Applications of sub-wavelength grating mirrors in high-power lasers

Marwan Abdou Ahmed
  • Corresponding author
  • Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
  • Stuttgart Research Center of Photonic Engineering (SCOPE), University of Stuttgart, Pfaffenwaldring 9, Stuttgart, Germany
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Martin Rumpel
  • Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
  • Stuttgart Research Center of Photonic Engineering (SCOPE), University of Stuttgart, Pfaffenwaldring 9, Stuttgart, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Andreas Voss
  • Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
  • Stuttgart Research Center of Photonic Engineering (SCOPE), University of Stuttgart, Pfaffenwaldring 9, Stuttgart, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Thomas Graf
  • Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany
  • Stuttgart Research Center of Photonic Engineering (SCOPE), University of Stuttgart, Pfaffenwaldring 9, Stuttgart, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2012-10-10 | DOI: https://doi.org/10.1515/aot-2012-0036

Abstract

A grating waveguide mirror (GWM) results from the combination of a waveguide and a sub-wavelength grating which lead, for given incidence conditions, to polarization and or wavelength filtering. In the present paper, we report on the application of such elements for the selection of the polarization (linear, radial, or azimuthal) as well as the narrowing, stabilizing and tuning of the emission spectrum of high-power lasers. Using a leaky-mode circular GWM, beams with radial and azimuthal polarization with output powers of up to 275 W and 145 W, respectively, could be extracted from a Yb:YAG thin-disk with optical efficiencies of 52.5% and 43%, respectively. In both cases, the GWM was composed of a highly reflective (HR) mirror and a sub-wavelength grating as the end-mirror of the resonator. Using a leaky-mode linear GWM operating under Littrow condition, beams with linear polarization and a narrow spectral bandwidth were obtained from a Yb:YAG thin-disk laser. In multimode operation, an output power of 325 W was achieved at an optical efficiency of 53.5%. In near-fundamental mode operation, 110 W was extracted at an optical efficiency of 36.2%. In this latter case, the spectral bandwidth was measured to be around 25 pm. Moreover, continuous wavelength tuning from 1007 to 1053 nm was demonstrated with our device.

Keywords: diffraction gratings; laser ytterbium; polarization selective device; sub-wavelength structure; wavelength filtering devices; OCIS codes: 050.1950; 140.3615; 130.5440; 050.6624; 230.7408

About the article

Marwan Abdou Ahmed

Marwan Abdou Ahmed received his ‘Diplôme d’Etudes Approfondies’ in 1999 and his PhD degree in 2003 at the University of Saint-Etienne, France. In 2004, he joined the Institut für Strahlwerkzeuge (IFSW), working mainly on the development of polarization and wavelength selective grating waveguide optics for high-power solid state lasers and on specialty fibers for high-power beam delivery. Since June 2011, he is responsible for the ‘Laser Development and Laser Optics’ Department at the IFSW.

Martin Rumpel

Martin Rumpel received his diploma degree in engineering from the University of Stuttgart, Germany. Since the beginning of 2011, he is working towards a PhD degree, where he is involved in the modeling and spectroscopic characterization, as well as characterization in laser operation of sub-wavelength waveguide grating structures for polarization and frequency selection in solid state lasers, particularly Yb:YAG thin-disk lasers.

Andreas Voss

Andreas Voss received his physics diploma in 1988 at the University of Dortmund and his PhD degree in 2002 at the Universität Stuttgart. In 1990, he joined the Institut für Strahlwerkzeuge (IFSW), working mainly on the development of the thin-disk laser until 1997. From 1998 until 2005, he was with TRUMPF Laser GmbH & Co. KG in Schramberg, Germany, where he continued his work on thin-disk laser. Since 2005, he is back at the IFSW, where he is responsible for scientific research on thin-disk and fiber lasers, laser optics, and optical fibers.

Thomas Graf

Thomas Graf was born in Switzerland in 1966. He received his physics MSc degree in 1993 and his PhD degree in 1996 from the University of Bern. After 15 months of research at Strathclyde University in Glasgow (UK), he was appointed Head of the High-Power Lasers Group at the Institute of Applied Physics at the University of Bern (in April 1999), where he was awarded a ‘venia docendi’ in 2001 and was appointed Assistant Professor in April 2002. In June 2004, he was appointed University Professor and Director of the Institut für Strahlwerkzeuge (IFSW) at the University of Stuttgart (D). At the IFSW, Prof. Graf is engaged in high-power laser systems, laser beam shaping, and laser applications in manufacturing. From 2001 to 2007, Prof. Graf served as a board member of the Swiss Society for Optics and Microscopy (SSOM), he is a board member of the European Optical Society (EOS), a board member of Photonics BW e.V., and is a regular member of the German Wissenschaftliche Gesellschaft Lasertechnik e.V., WLT (Scientific Society for Laser Technology).


Corresponding author: Marwan Abdou Ahmed, Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, Stuttgart, Germany


Received: 2012-07-24

Accepted: 2012-09-05

Published Online: 2012-10-10

Published in Print: 2012-10-01


Citation Information: Advanced Optical Technologies, Volume 1, Issue 5, Pages 381–388, ISSN (Online) 2192-8584, ISSN (Print) 2192-8576, DOI: https://doi.org/10.1515/aot-2012-0036.

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