Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers

Norhana Arsad, George Stewart

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

1 Citation (Scopus)

Abstract

Fibre laser sources offer interesting possibilities for gas sensors since they can operate over an extended wavelength range, encompassing the near-IR absorption lines of a number of important gases but a major problem is that overtone absorption lines of gases in the near-IR are relatively weak. In order to enhance sensitivity, we present here a simple method of intra-cavity laser absorption spectroscopy (ICLAS) which makes use of the amplified spontaneous emission (ASE) already present within a fibre laser cavity. The ASE also provides a convenient broad-band source for the interrogation of several gases within the gain-bandwidth of the fibre laser. The key principle is based on adjusting the cavity attenuation to select an appropriate inversion level and hence flatten the erbium-fibre gain curve. Under this condition, the ASE undergoes multiple circulations within the fibre laser cavity, enhancing the effective path-length of a gas cell placed within the laser cavity. We have experimentally demonstrated the principle of operation with acetylene gas, using a simple erbium fibre laser system containing a 6cm path-length, fibre coupled, intra-cavity, micro-optic gas cell. For 1% acetylene gas, we have experimentally observed 16 absorption lines in the 1530nm region and a path length enhancement of ∼60 has been demonstrated, transforming the 6cm micro-optic cell into an effective path length of ∼3.5m. Apart from the OSA, all components are inexpensive and the system is very simple to construct and operate.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7503
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event20th International Conference on Optical Fibre Sensors - Edinburgh
Duration: 5 Oct 20099 Oct 2009

Other

Other20th International Conference on Optical Fibre Sensors
CityEdinburgh
Period5/10/099/10/09

Fingerprint

Erbium
Spontaneous emission
Fiber Laser
Fiber lasers
erbium
spontaneous emission
fiber lasers
Spectroscopy
Cavity
Gases
cavities
Path Length
Laser resonators
gases
spectroscopy
Micro-optics
Microoptics
laser cavities
Acetylene
Absorption

Keywords

  • Erbium-doped fibre lasers
  • Fibre sensors
  • Gas sensors
  • Intra-cavity spectroscopy
  • Laser spectroscopy

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). Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7503). [750312] https://doi.org/10.1117/12.834330

Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers. / Arsad, Norhana; Stewart, George.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7503 2009. 750312.

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

Arsad, N & Stewart, G 2009, Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7503, 750312, 20th International Conference on Optical Fibre Sensors, Edinburgh, 5/10/09. https://doi.org/10.1117/12.834330
Arsad N, Stewart G. Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7503. 2009. 750312 https://doi.org/10.1117/12.834330
Arsad, Norhana ; Stewart, George. / Intra-cavity spectroscopy using amplified spontaneous emission in erbium fibre lasers. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7503 2009.
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