Two-photon excited fluorescence in praseodymium doped fibre and its application in distributed optical fibre sensing of temperature

C. J. Dalzell, T. P. J. Han, I. S. Ruddock

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


Distributed temperature sensing based on time-correlated two-photon excited fluorescence (TPF) in doped fibre is described. Counter-propagating laser pulses generate a TPF flash at the position of overlap which is scanned along the fibre by a variable relative time delay. The flash is detected and analysed at one end. With the fluorescence power being completely independent of excitation pulse duration and temporal profile, the sensor does not require ultrashort excitation pulses for operation. There is potential for high spatial resolution as the length of the sensed region depends only on pulse duration. TPF is reported in bulk glass doped with rare earths and in doped single-mode fibre. The suitability of fluorescence transitions for sensing is discussed taking into account the temperature dependence of the decay times, the location of the terminating energy level relative to the ground state, and the option of non-degenerate TPF.
Original languageEnglish
Title of host publication21st International Conference on Optical Fiber Sensors
EditorsW.J. Bock, J. Albert, X. Bao
Place of PublicationBellingham
Publication statusPublished - 2011
Event21st International Conference on Optical Fiber Sensors - Ottawa, Canada
Duration: 15 May 201119 May 2011

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


Conference21st International Conference on Optical Fiber Sensors


  • fluorescence
  • optical fibre sensor
  • strain
  • two-photon excitation
  • distributed sensing
  • doped fibre
  • temperature
  • praseodymium
  • fibre sensing
  • temperature
  • application

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