We demonstrate single-mode, highly polarized output from a thulium-doped photonic crystal fiber (PCF) with 50 μm core diameter and an ultra-large mode area >1000 μm2. To our knowledge, this is the largest mode area of any flexible PCF and is capable of enabling the generation of high peak powers. In a Q-switched oscillator configuration, this fiber produces peak powers as high as 8.9 kW with 435 μJ, 49 ns pulses, >15 dB polarization extinction ratio and quasi diffraction-limited beam quality. The pulse energy was scaled to >1 mJ in amplifier configuration.
|Journal||Proceedings of SPIE, the International Society for Optical Engineering|
|Publication status||Published - 2012|
|Event||SPIE Defense, Security, and Sensing : Laser Technology for Defense and Security VIII - Baltimore, MD, United States|
Duration: 23 Apr 2012 → 27 Apr 2012
|Conference||SPIE Defense, Security, and Sensing : Laser Technology for Defense and Security VIII|
|Period||23/04/2012 → 27/04/2012|