Fiber laser incorporating an intracavity micro-channel for refractive index and temperature sensing

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

Research output: Contribution to journalArticlepeer-review


In this letter, we present a standard linear cavity fiber laser incorporating a microchannel for refractive index (RI) and temperature sensing. The microchannel of ~6µm width created by femtosecond laser aided chemical etching provides an access to the external liquid; therefore, the laser cavity loss changes with the liquids of different RIs. Thus, at a fixed pump power, the output laser power will vary with the change of RI in the microchannel. The results show that the proposed sensing system has a linear response to both the surrounding medium RI and temperature. The RI sensitivity of the laser system is on the order of 10-3, while the temperature sensitivity is about 0.02 C. Both sensitivities could be further enhanced by employing a more sensitive photodetector and using higher pump power.
Original languageEnglish
Article number28
Pages (from-to)1559-1561
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number20
Publication statusPublished - 15 Oct 2009

Bibliographical note

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  • femtosecond laser
  • fiber laser sensor
  • microchannel
  • refractive index sensor
  • fibre lasers
  • fibre optic sensors
  • photodetectors
  • refractive index
  • temperature sensors


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