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Direct amplification of ultra short pulses at 1037 nm from fiber-oscillators to average powers of ~100 W at 48 MHz is demonstrated using single-stage amplifiers comprising new all-glass-leakage-channel-fibers, providing >70% slope efficiency and >33 dB gain.
Leakage channel fibers (LCFs) have demonstrated their ability to significantly extend the effective mode area of a fundamental mode while maintaining robust single-mode operation. These fibers are designed to have strong built-in mode filtering that effectively suppresses the propagation of all higher order modes while keeping fundamental-mode loss to a minimum, and, therefore, effectively extending...
Strictly single-mode fibres with record core-diameters of 82 mum @ 1 mum and 130 mum @ 1.55 mum are demonstrated. They have parabolic index profile with record low index difference of ~6times10-5, achieved by innovative built-in thermal stress.
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