1992•Electronics LettersRequires access

Thulium sensitised holmium-doped CW fluoride fibre laser of high efficiency

R.M. Percival, D. Szebesta, S.T. Davey, N.A. Swain, Terence A. King

Abstract

CW operation of extremely high efficiency has been observed from the 2.024 μm transition of holmium in a Tm: Ho codoped singlemode fluoride fibre laser. By pumping into thulium absorption between 820 and 830 nm, output powers of 250 mW and maximum slope efficiencies of 60 % were observed. These results suggest that pump quantum, and photon conversion efficiencies of 150 and 75 % respectively, are readily attainable.

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Key concepts: Holmium, Thulium, Slope efficiency, Materials science, Fluoride, Laser, Doping, Optoelectronics