Passive mode-locking of a Ti:sapphire laser by InGaP quantum-dot saturable absorber

V.G. Savitski, P.J. Schlosser, J.E. Hastie, A.B. Krysa, J.S. Roberts, M.D. Dawson, D. Burns, S. Calvez

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We demonstrate the use of a novel InGaP quantum-dot (QD) saturable absorber (SA) to induce passively mode-locked (ML) operation of a Ti : sapphire laser. Pulses as short as 518 fs are obtained at 752 nm with an average output power of up to 190 mW for 2.3 W of absorbed pump power at 532 nm. The absorption recovery of the SA is characterized by two decay coefficients: a fast and a slow component having time constants of 0.4 and 300 ps, respectively. The saturation fluence of the InGaP QDs was measured to be 28 J/cm2, the initial low-signal absorption was 1.5%, where 1.15% was nonsaturable loss.

Original languageEnglish
Pages (from-to)209-211
Number of pages3
JournalIEEE Photonics Technology Letters
Volume22
Issue number4
DOIs
Publication statusPublished - 15 Feb 2010

Keywords

  • laser absorbers
  • mode-locked (ML) laser
  • spectroscopy
  • ultrafast optics

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