Chu Kuan-Chen, Jiang Hao-Yuan, Yang Shang-Da
Opt Lett. 2015 Nov 15;40(22):5319-22. doi: 10.1364/OL.40.005319.
We demonstrated high-energy femtosecond amplifier-similariton oscillators with predominant Er-doped fibers of normal dispersion. Stably mode-locked pulses of ~3 ps, 33 nJ were produced at 720 mW pump power, while a double-pass grating pair of 36% efficiency compressed the pulses to 156 fs and 47 kW peak power (a new record). Broad mode-locked spectra supporting transform-limited pulsewidths down to 60 fs were obtained by adjusting the intracavity waveplates and filter. Continuous wave (CW) mode-locked pulses up to 53 nJ were generated by increasing the pump power to 1.5 W and by introducing significant spectral phase modulation via an intracavity pulse shaper. However, weak subpulses or pedestal could arise along with increased shot-to-shot fluctuation under this extreme operation mode.
我们展示了具有正常色散的主要掺铒光纤的高能量飞秒放大器-类孤子振荡器。在720毫瓦泵浦功率下产生了约3皮秒、33纳焦的稳定锁模脉冲，而效率为36%的双程光栅对将脉冲压缩至156飞秒和47千瓦峰值功率（一项新记录）。通过调整腔内波片和滤波器，获得了支持低至60飞秒的变换极限脉冲宽度的宽带锁模光谱。通过将泵浦功率提高到1.5瓦并通过腔内脉冲整形器引入显著的光谱相位调制，产生了高达53纳焦的连续波（CW）锁模脉冲。然而，在这种极端工作模式下，随着逐次波动的增加，可能会出现微弱的子脉冲或基座信号。
