A. V. V. Nampoothiri

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Lasing from population inversion is demonstrated from gas contained in a hollow-core kagome structured photonic crystal fiber. Laser pulses in the mid-IR (3.1–3.2 µm) were generated by optically pumping at λ ∼ 1.5 µm.
We demonstrate what we believe is the first hollow fiber gas laser based on population inversion. A single-cell-defect Kagome fiber with a core diameter of about 40 microns was filled with a few torr of acetylene (<sup>12</sup>C<inf>2</inf>H<inf>2</inf>). Acetylene has absorption transitions in the attractive telecommunication C band region and recently(More)
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