Mid-IR lasers operating at 3 – 3.2 μm and 4.3 – 4.4 μm with efficiencies near 20% have been demonstrated from 12C2H2 and HCN-filled low-loss (< 5 dB/m) kagome-structure HC-PCF and from CO2-filled silver coated capillaries.

© 2012 Optical Society of America

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