Abstract

Laser oscillations using Tm-doped fluoride fiber at 0.8,1.47,1.9 and 2.3 pm have been reported[1-4]. In these lasers, Tm ions are excited to the 3F4 level with 0.79 µm[l-3] or 0.676 µm[4] pump light. The branching ratios to the 0.8, 1.47 and 2.3 µm transitions from the 3F4 level are 0.893, 0.083 and 0.024, respectively[5]. Although the branching ratio of the 0.8 µm transition is much larger than the others, 1.9, 1.47 and 2.3 µm laser oscillations are possible by incorporating a dichroic mirror in the laser cavity and suppressing 0.8 µm laser oscillation.

© 1993 Optical Society of America

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