Stable, tunable and single-mode operation of an erbium-doped fibre laser system using a saturable absorber for gas spectroscopy applications

Norhana Arsad, George Stewart

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

We present an erbium doped fibre ring laser system to realize single frequency lasing by incorporating a reflector with ~2m of un-pumped polarization-maintaining erbium-doped fibre to act as a saturable absorber. Depending on the particular requirements, the fibre reflector may be a fibre Bragg grating (FBG), loop mirror (LM) or a reflective coating on the fibre end. In this way, a transient grating is formed in the saturable absorber which acts as a narrow-band optical filter, reducing the number of modes over which the laser can operate and hence suppressing mode hopping in the cavity. Polarization-maintaining (PM) components are used throughout the system, except for the EDFA, and a polarization controller is used for enhancing stability and to ensure that the state of polarization is properly aligned. With this system we have observed a long period of stable, narrow line-width and single mode operation, tuneable over 30nm. The intended application is for gas spectroscopy using wavelength scanning and pump modulation. A Sagnac loop filter (SLF) can be used to scan the centre wavelength over a gas absorption line while the pump modulation produces an amplitude modulated signal on the output, suitable for detection by a lock-in (phase-sensitive) amplifier. The method is useful for the recovery of absorption line-shapes in the near-IR where the overtone absorption lines are weak. Compared with the use of a traditional DFB laser source, the fibre laser offers the advantages of a much broader tuning range and recovery of distortion-free line-shapes since wavelength and amplitude modulation may be performed independently.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7195
DOIs
Publication statusPublished - 2009
Externally publishedYes
EventFiber Lasers VI: Technology, Systems, and Applications - San Jose, CA, United States
Duration: 26 Jan 200929 Jan 2009

Other

OtherFiber Lasers VI: Technology, Systems, and Applications
CountryUnited States
CitySan Jose, CA
Period26/1/0929/1/09

Fingerprint

gas spectroscopy
Erbium
Saturable Absorber
Erbium-doped Fiber
Saturable absorbers
Fiber Laser
Single Mode
Fiber lasers
Laser modes
erbium
fiber lasers
Spectroscopy
absorbers
Polarization
Gases
Absorption
fibers
Line
Reflector
polarization

Keywords

  • Erbium-doped fibre lasers
  • Fibre sensors
  • Laser spectroscopy
  • Saturable absorbers
  • Single-mode fibre lasers

ASJC Scopus subject areas

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

Cite this

Arsad, N., & Stewart, G. (2009). Stable, tunable and single-mode operation of an erbium-doped fibre laser system using a saturable absorber for gas spectroscopy applications. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7195). [719525] https://doi.org/10.1117/12.808157

Stable, tunable and single-mode operation of an erbium-doped fibre laser system using a saturable absorber for gas spectroscopy applications. / Arsad, Norhana; Stewart, George.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7195 2009. 719525.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Arsad, N & Stewart, G 2009, Stable, tunable and single-mode operation of an erbium-doped fibre laser system using a saturable absorber for gas spectroscopy applications. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7195, 719525, Fiber Lasers VI: Technology, Systems, and Applications, San Jose, CA, United States, 26/1/09. https://doi.org/10.1117/12.808157
Arsad, Norhana ; Stewart, George. / Stable, tunable and single-mode operation of an erbium-doped fibre laser system using a saturable absorber for gas spectroscopy applications. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7195 2009.
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