Abstract
In this paper, we demonstrate a pulsed, multimode narrow laser emission in the visible spectral range from free-standing cylindrical microcavities formed by dye doped hollow polymer optical fiber photopumped by Nd:YAG laser. The characteristics of multimode laser emission with different pump powers have been also studied. The laser was characterized by narrow emission lines (∼ 0.06 nm), reduced mode spacing (∼ 0.12 nm) and high quality factor, Q (> 9×103) and exhibit threshold excitation intensity of as low as 4 mW. The observed modes are whispering gallery modes close to the optical fiber surface.
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