Abstract

We describe lasing of a thulium-doped polarizing photonic crystal fiber. A 4m long fiber with 50μm diameter core, 250μm diameter cladding, and d/Λ ratio of 0.18 was pumped with a 793nm diode and produced a polarized output with a polarization extinction ratio (PER) of 15dB and an M2 of <1.15. An intracavity polarizer and half-wave plate minimally increased the PER to 16dB. The output power had 35% slope efficiency relative to the absorbed pump power. The maximum cw output power was limited to 4W due to the quantum defect heating of the fiber.

© 2011 Optical Society of America

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