Fibre laser using a microchannel based loss tuning element for refractive index sensing

Chengbo Mou, Kaiming Zhou, Edward Davies, Lin Zhang, Ian Bennion

Research output: Chapter in Book/Published conference outputConference publication


We have proposed and demonstrated a fibre laser system using a microchannel as a cavity loss tuning element for surrounding medium refractive index (SRI) sensing. A ~6µm width microchannel was created by femtosecond (fs) laser inscription assisted chemical etching in the cavity fibre, which offers a direct access to the external liquids. When the SRI changes, the microchannel behaves as a loss tuning element, hence modulating the laser cavity loss and output power. The results indicate that the presented laser sensing system has a linear response to the SRI with a sensitivity in the order of 10-5. Using higher pump power and more sensitive photodetector, the SRI sensitivity could be further enhanced.
Original languageEnglish
Title of host publication20th international conference on optical fibre sensors
EditorsJulian D.C. Jones, Brian Culshaw, Wolfgang Ecke, José M. López-Higuera, Reinhardt Willsch
ISBN (Print)978-0-8194-7814-6
Publication statusPublished - 5 Oct 2009
Event20th International Conference on Optical Fibre Sensors - Edinburgh, United Kingdom
Duration: 5 Oct 20099 Oct 2009

Publication series

NameSPIE proceedings
ISSN (Print)0277-786X


Conference20th International Conference on Optical Fibre Sensors
Country/TerritoryUnited Kingdom
OtherThe International Conference on ‘Optical Fibre Sensors’ is acknowledged as the world’s leading conference on all topics related to fibre-optic, guided-wave and optical sensing devices, systems, theories and techniques for research and applications.

Bibliographical note

Chengbo Mou ; Kaiming Zhou ; Edward Davies ; Lin Zhang and Ian Bennion
"Fibre laser using a microchannel based loss tuning element for refractive index sensing", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035D (October 05, 2009); doi:10.1117/12.834749.

Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • photonics
  • femtosecond laser
  • microchannel
  • fibre laser
  • refractive index sensor


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