Characterization of mid-infrared emissions from C2H2, CO, CO2, and HCN-filled hollow fiber lasers

Abstract : We have now demonstrated and characterized gas-filled hollow-core fiber lasers based on population inversion from acetylene (12C2H2) and HCN gas contained within the core of a kagome-structured hollow-core photonic crystal fiber. The gases are optically pumped via first order rotational-vibrational overtones near 1.5 μm using 1-ns pulses from an optical parametric amplifier. Transitions from the pumped overtone modes to fundamental C-H stretching modes in both molecules create narrow-band laser emissions near 3 μm. High gain resulting from tight confinement of the pump and laser light together with the active gas permits us to operate these lasers in a single pass configuration, without the use of any external resonator structure. A delay between the emitted laser pulse and the incident pump pulse has been observed and is shown to vary with pump pulse energy and gas pressure. Furthermore, we have demonstrated lasing beyond 4 μm from CO and CO2 using silver-coated glass capillaries, since fused silica based fibers do not transmit in this spectral region and chalcogenide fibers are not yet readily available. Studies of the laser pulse energy as functions of the pump pulse energy and gas pressure were performed. Efficiencies reaching ~ 20% are observed for both acetylene and CO2.
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https://hal-unilim.archives-ouvertes.fr/hal-00925085
Contributeur : Frédéric Gerome <>
Soumis le : mardi 7 janvier 2014 - 15:13:06
Dernière modification le : jeudi 4 avril 2019 - 11:52:06

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Andrew Jones, Coralie Fourcade Dutin, Chenchen Mao, Bastian Baumgart, A. V. Nampoothiri, et al.. Characterization of mid-infrared emissions from C2H2, CO, CO2, and HCN-filled hollow fiber lasers. Photonics west 2012, SPIE, Jan 2012, San francisco, United States. pp.8237, ⟨10.1117/12.909254⟩. ⟨hal-00925085⟩

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