Nanosecond Q-switched operation of coupled Yb and Tm fibre lasers

Yuen Hong Tsang, Fadi Qamar, Terence A. King, Do Kyeong Ko, Jongmin Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


A small scale coupled Yb-silica and Tm-silica fibre laser system is described with output at 1.9 μm and with Q-switching using an acousto-optic modulator and also by mechanical optical modulation. The Yb-fibre laser pump source exhibited strong self-pulsation with high-intensity pulses due to stimulated Brillouin scattering. But regular Q-switched pulses were generated from the Tm-fibre laser with an energy of ∼2.4μJ and duration (FWHM) of ∼280 ns for modulation frequencies of 1-20 kHz when using acousto-optic modulation. The main effects that limit the Q-switched pulse peak power are the onset of gain-switched pulsing during the low-Q state and strong pump excited state absorption.
Original languageEnglish
Pages (from-to)1365-1370
Number of pages6
JournalJournal of Physics D: Applied Physics
Issue number9
Publication statusPublished - 7 May 2005
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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