Abstract
The limiting effect of the self-terminating 3H4-3F4 transition on the gain of a thulium ZBLAN fibre amplifier has been reduced by the integration of a fibre ring cavity into the amplifier. The ring cavity allows co-operative laser oscillation at 1.88 µm, enhancing the obtainable gain. A gain of 11 dB was observed at 1.49 µm for a 4 m fibre length.
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