Mid IR hollow core fiber gas laser emitting at 4.6 µm

Beygi Azar Aghbolagh (1) , A. V. Vasudevan Nampoothiri (1) , Benoît Debord (2) , Frédéric Gérôme (2) , Fetah Benabid (2) , Wolfgang Rudolph (1)

1 The University of New Mexico [Albuquerque]
2 XLIM-PHOT - Photonique Fibre et Sources Cohérentes

Emission at 4.6 μm was observed from an N 2 O filled hollow core fiber laser. 8-ns pump pulses at 1.517 μm excited a vibrational overtone resulting in lasing on an R and P branch fundamental transition from the upper pump state. At optimum gas pressure of 80 Torr, photon conversion efficiency of 9% and slope efficiency of 3% were observed from a mirrorless laser. The laser threshold occurred at absorbed pump energy of 150 nJ in a 45-cm long fiber with 85 μm core diameter. The observed dependence of the laser output on gas pressure was shown to be a result of line broadening and relaxation rates.

Domaines: Optique / photonique

Beygi Azar Aghbolagh, A. V. Vasudevan Nampoothiri, Benoît Debord, Frédéric Gérôme, Fetah Benabid, et al.. Mid IR hollow core fiber gas laser emitting at 4.6 µm. Optics Letters, 2019, 44 (2), pp.383-386. ⟨10.1364/OL.44.000383⟩. ⟨hal-02150243⟩