• P Radhakrishnan

      Articles written in Pramana – Journal of Physics

    • A microring multimode laser using hollow polymer optical fibre

      M Kailasnath V P N Nampoori P Radhakrishnan

      More Details Abstract Fulltext PDF

      We report the observation of multimode laser operation at wavelengths corresponding to whispering-gallery modes from a freestanding microring cavity based on rhodamine B dye-doped PMMA hollow optical fibre. Cylindrical microcavities with diameters 155, 340 and 615 𝜇m were fabricated from a dye-doped hollow polymer optical fibre preform. An average mode spacing of 0.17 nm was observed for the 340 𝜇m cavity. This shows that the laser mode intensity distribution is concentrated on the outer edge of the cavity.

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