High-power sub-two-cycle mid-infrared pulses at 100 MHz repetition rate
High-power sub-two-cycle mid-infrared pulses at 100 MHz repetition rate
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DOI：
10.1038/nphoton.2015.179
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发表时间：
2015-11-01
期刊：
影响因子：
35
通讯作者：
Biegert, J.
中科院分区：
文献类型：
--
作者：
Pupeza, I.;Sanchez, D.;Biegert, J.
具有跨越中红外（MIR）光谱范围的光谱的强大相干光对于自然科学和生命科学中的许多应用至关重要，但到目前为止，只能从大规模同步加速器光源中获得（1）。在这里，我们提出了一个紧凑的装置，产生脉冲的子两个周期的持续时间和0.1 W的平均功率和6.8-16.4 μ m（在-30 dB）的频谱覆盖范围。演示的源结合，在这个光谱区域中的第一次，高功率，高重复率和相位相干。利用克尔透镜锁模掺镱钇铝石榴石（Yb：YAG）薄片振荡器的非线性压缩脉冲驱动差频产生（DFG），产生MIR脉冲。由此产生的100 MHz MIR脉冲序列比在该范围内发射的最先进的频率梳（2-4）强数百至数千倍，并且为分子指纹区域（4-7）中的光谱学提供了高动态范围，并且为高光谱成像（8）以及振动动力学的时域相干控制（9-11）提供了理想的先决条件。
Powerful coherent light with a spectrum spanning the mid-infrared (MIR) spectral range is crucial for a number of applications in natural as well as life sciences, but so far has only been available from large-scale synchrotron sources(1). Here we present a compact apparatus that generates pulses with a sub-two-cycle duration and with an average power of 0.1 W and a spectral coverage of 6.8-16.4 mu m (at -30 dB). The demonstrated source combines, for the first time in this spectral region, a high power, a high repetition rate and phase coherence. The MIR pulses emerge via difference-frequency generation (DFG) driven by the nonlinearly compressed pulses of a Kerr-lens mode-locked ytterbium-doped yttrium-aluminium-garnet (Yb:YAG) thin-disc oscillator. The resultant 100 MHz MIR pulse train is hundreds to thousands of times more powerful than state-of-the-art frequency combs that emit in this range(2-4), and offers a high dynamic range for spectroscopy in the molecular fingerprint region(4-7) and an ideal prerequisite for hyperspectral imaging(8) as well as for the time-domain coherent control of vibrational dynamics(9-11).