Abstract
Q-switched operation of a 2 μm Tm 3+-doped silica fiber laser using an electro-optic modulation (EOM) is described for the first time. A larger multimode core of 17 μm diameter is used to increase the laser gain volume and achieve higher pulse energy. Experimentally this laser produced pulses with a peak power of ∼3.3 kW at a low repetition rate of 70 Hz and a pulse energy up to 2.3 mJ, limited by excited state absorption with only slightly compromized spatial-mode quality ( M 2∼1.5). This approach using an EOM offers significant scope for extending the range of single-mode output powers and energies that are achievable from fiber lasers and amplifier systems.
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