Articles written in Pramana – Journal of Physics
Volume 75 Issue 5 November 2010 pp 923-927 Conributed Papers
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.
Volume 82 Issue 2 February 2014 pp 233-236 Contributed Papers
Well-resolved multimode laser emission was observed for the first time from a freestanding microring cavity based on Rhodamine B dye-doped hollow polymer optical fibre by transverse pumping. Fibres with different diameters such as 180, 460, 640 and 800 𝜇m were fabricated from a dye-doped hollow polymer preform. A blueshift in the mode structure was observed with decrease in fibre diameter leading to wide range tunability of the laser emission.
Volume 94, 2020
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