Multimegawatt peak-power, single-transverse-mode operation of a 100 μm core diameter, Yb-doped rodlike photonic crystal fiber amplifier

摘要

The authors report on the performance of an Yb-doped, 100 μm core rodlike photonic crystal fiber (PCF) used as the final amplifier in a gain-staged master-oscillator/power-amplifier source. From the PCF, they obtained 1-ns-long pulses of energy in excess of 4.3 ml, peak/average power ～4.5 MW/42 W, and spectral linewidth ～20 GHz. The PCF emitted a beam exhibiting near-Gaussian, single-transverse-mode profile of M~2～ 1.3.