Isolator-free unidirectional thulium-doped fiber laser

Svyatoslav Kharitonov; Camille-Sophie Brès

doi:10.1038/lsa.2015.113

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Isolator-free unidirectional thulium-doped fiber laser

Original Articles

- Isolator-free unidirectional thulium-doped fiber laser
- Light: Science & Applications Vol. 4, Issue 4, (2015)
- Affiliations：
  
  Ecole Polytechnique Fédérale de Lausanne (EPFL), Photonic Systems Laboratory (PHOSL), STI-IEL, Station 11, CH-1015 Lausanne, Switzerland
- Author bio：
  
  S Kharitonov, Email: svyatoslav.kharitonov@epfl.ch
- Funds：
- DOI：10.1038/lsa.2015.113
  CLC：
- Published：2015-12，
  
  Published Online：15 June 2015，
  
  Received：18 December 2014，
  
  Revised：08 June 2015，
  
  Accepted：15 June 2015
- Accepted：
Scan QR Code
Kharitonov, S. & Brès, C. S. Isolator-free unidirectional thulium-doped fiber laser. Light: Science & Applications, 4, e340 (2015).
DOI：

Kharitonov, S. & Brès, C. S. Isolator-free unidirectional thulium-doped fiber laser. Light: Science & Applications, 4, e340 (2015). DOI： 10.1038/lsa.2015.113.

摘要

Abstract

We report the first demonstration of a unidirectional

isolator-free 2-μm thulium-doped fiber (TDF) laser

relying on the properties of the theta cavity (ring resonator with S-shaped feedback). The core pumped theta cavity TDF laser provides sub-Watt output power with a slope efficiency of 25%

a 2 dB flat tuning range of 1900–2050 nm

and a linewidth of 0.2 nm

and achieves the extinction ratio of 18–25 dB (depending on the feedback value) between the favored and suppressed lasing directions. It is shown that these characteristics are competitive with

if not superior to

those of conventional ring cavities. The simulation results of the linear and Kerr-nonlinear theta cavities are also presented

explaining certain unexpected features of the laser behavior and establishing the importance of the doped fiber nonlinearity on the spectral shaping of the emitted signal.

关键词

Keywords

fiber lasernonlinear amplifying loop mirrorshort-wave infrared coherent sourcesthulium-doped fiber

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