Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany.
Opt Lett. 2011 Aug 15;36(16):3030-2. doi: 10.1364/OL.36.003030.
We report for the first time, to the best of our knowledge, on a large mode area Er-doped photonic crystal fiber laser system. The fiber core had a diameter of 40 μm and NA of <0.04 leading to a mode field diameter of about 31 μm around 1550 nm wavelength. More than 70 W of single-frequency output power at 1556 nm could be extracted using a master-oscillator power-amplifier scheme. Near diffraction limited output beam quality has been verified by measuring the TEM(00) content with a nonconfocal scanning ring cavity.
我们首次在所知的范围内报告了一种大模场掺铒光子晶体光纤激光系统。光纤芯的直径为 40μm，数值孔径<0.04，导致在 1550nm 波长下的模场直径约为 31μm。采用主振荡器功率放大器方案，可从光纤中提取超过 70W 的单频输出功率，在 1556nm 处。通过使用非共焦扫描环形腔测量 TEM(00)含量，验证了近衍射极限的输出光束质量。
