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26 November 2007Strain related characteristics of composite cavity fibre lasers
A novel composite cavity fibre laser (CCFL) design is being investigated for its use in sensing applications. A CCFL can
be fabricated simply by writing three spectrally matched Bragg gratings directly into a continuous length of doped fibre.
When strained evenly, so that the strain experienced by both cavities are the same, the strain response of the CCFL is
expected to be similar to that of a FBG or single cavity fibre laser sensor. However, if the internal cavities are strained
unevenly, simulations derived from theoretical analysis suggest that the wavelength-encoded and intensity-encoded
sensitivities can become significantly different from that of a typical single cavity fibre laser. A 3cm/9cm CCFL was
tested using three different straining formats, and results agree well with theoretical expectations.
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Ian Leung, Allan C. L. Wong, Gang-Ding Peng, "Strain related characteristics of composite cavity fibre lasers," Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68301W (26 November 2007); https://doi.org/10.1117/12.757568