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arXiv · 2510.07188

Multimode emission of fluorinated ethylene propylene clad large diameter liquid-core lasers

Anand Dewansingh·Abigail Deaton·Cortland Bergman·Hengzhou Liu·Tracy Olin·Nathan J. Dawson
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Abstract

A liquid-core (LiCo) dye laser was demonstrated using Rhodamine B (RhB) dissolved in glycerol as the gain medium and fluorinated ethylene propylene (FEP) tubing as the waveguide. Photoluminescence and amplified spontaneous emission (ASE) studies identified optimal RhB concentrations of 0.1 wt.% and 0.3 wt.% for low-threshold laser operation. Laser emission was achieved in LiCo rods with 1/16 inch and 1/32 inch inner diameter FEP tubing, with narrower tubing providing enhanced mode confinement and spectral narrowing. The addition of cavity mirrors improved emission coherence, revealing a distinct laser mode at low pump energies with mode spacing inconsistent with a simple Fabry-Pérot cavity, indicating complex mode coupling and internal reflections. Limitations include spectral broadening and scattering-induced parasitic feedback, which suggest avenues for further optimization in waveguide materials and output coupling.

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Anand Dewansingh, Abigail Deaton, Cortland Bergman, Hengzhou Liu, Tracy Olin, Nathan J. Dawson. 2025-10-08. Multimode emission of fluorinated ethylene propylene clad large diameter liquid-core lasers. https://doi.org/10.1088/1612-202x%2Fae18b4

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