Q-switching of mid-infrared Er:YAG laser and its radiation delivery system

Helena Jelínková, Petr Koranda, Michal Němec, Jan Šulc, Miroslav Čech, Mitsunobu Miyagi, Yi Wei Shi, Yuji Matsuura

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Q-switching of mid-infrared Er:YAG laser was obtained with an electro-optical shutter. For that the LiNbO3 Pockels cell was used in transversal quarter-wave arrangement with Brewster angle cut faces used as a polarizer. Parameters and dependences of this Q-switched system were investigated, i.e. a pulse length and generated pulse energy, delay between switching of flashlamp and Q-switch circuit, high voltage applied on Pockels cell, were measured and optimized. The resulted giant pulse length and energy was 60ns and 55 mJ, respectively. This generated pulse was obtained for the applied voltage around 1.4 kV and for the optimum delay value 450 μs. Problem of mid-infrared giant pulse delivery, which is needed for various technological applications, was solved by a specially designed cyclic olefin polymer coated silver hollow glass (COP/Ag) waveguide. Parameters of this waveguide were - diameter 700/850 μm and length 1 m. The measured transmission was 78.6 % which corresponded to delivered intensity 86MW/cm 2. Q-switched Er:YAG laser radiation in connection with this special delivery system gives a possibility of the surgical treatment in many medicine branches, for example ophthalmology, urology or dentistry.

Original languageEnglish
Pages (from-to)64-73
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5460
DOIs
Publication statusPublished - 2004 Dec 20
EventSolid State Lasers and Amplifiers - Strasbourg, France
Duration: 2004 Apr 272004 Apr 29

Keywords

  • Er:YAG laser
  • Hollow waveguide
  • LiNbO Pockels cell
  • Q-switching

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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