High-power wavelength-tunable photonic-crystal-fiber-based oscillator-amplifier-frequency-shifter femtosecond laser system and its applications for material microprocessing

High-power wavelength-tunable photonic-crystal-fiber-based oscillator-amplifier-frequency-shifter femtosecond laser system and its applications for material microprocessing
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高功率波长可调谐光子晶体光纤振荡器放大器移频飞秒激光系统及其在材料微加工中的应用

DOI:
10.1002/lapl.200810084
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发表时间:
2008
影响因子:
1.7
通讯作者:
Zheltikov, A. M.
Zheltikov, A. M.
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Liu, B. -W;Hu, M. -L.;Fang, X. -H.;Wu, Y. -Z;Song, Y-J.;Chai, L.;Wang, C-Y;Zheltikov, A. M.

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基于光子晶体光纤技术,研制了高功率波长可调飞秒光纤激光源。该系统的激光振荡器和放大器级采用无拉伸器结构的二极管泵浦掺镱单偏振大模面积光子晶体光纤,脉冲压缩后以50 MHz的重复频率输出平均功率10.4 W、脉冲宽度52 fs、峰值功率4 MW的激光脉冲。这种激光脉冲在高度非线性光子晶体光纤中的非线性变换产生波长在1.0 ~ 1.4 μm范围内平滑可调的光脉冲,并允许产生从450到至少1750 nm的超连续光谱。我们报告了高重复率的硅微加工和铬纳米膜图案化实验,证明了所开发的光纤激光源在快速微加工、微制造和微加工方面的潜力。
A high-power wavelength-tunable femtosecond fiber laser source is developed based on photonic-crystal fiber technology. Laser oscillator and amplifier stages in this system employ diode-pumped ytterbium-doped single-polarization large-mode-area photonic-crystal fibers in a stretcher-free configuration, delivering laser pulses with an average power of 10.4 W, a pulse width of 52 fs, and a peak power of 4 MW at a repetition rate of 50 MHz after pulse compression. Nonlinear transformation of such laser pulses in a highly nonlinear photonic-crystal fiber yields light pulses smoothly tunable within the range of wavelengths from 1.0 to 1.4 μm and allows the generation of supercontinuum stretching from 450 to at least 1750 nm. We report experiments on silicon microprocessing and chromium nanofilm patterning at a high repetition rate, demonstrating the potential of the developed fiber-laser source for fast micromachining, microfabrication, and microprocessing.
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