Lanin A A, Voronin A A, Stepanov E A, Fedotov A B, Zheltikov A M
Opt Lett. 2014 Nov 15;39(22):6430-3. doi: 10.1364/OL.39.006430.
A physical scenario whereby freely propagating mid-infrared pulses can be compressed to pulse widths close to the field cycle is identified. Generation of tunable few-cycle pulses in the wavelength range from 4.2 to 6.8 μm is demonstrated at a 1-kHz repetition rate through self-focusing-assisted spectral broadening in a normally dispersive, highly nonlinear semiconductor material, followed by pulse compression in the regime of anomalous dispersion, where the dispersion-induced phase shift is finely tuned by adjusting the overall thickness of anomalously dispersive components. Sub-two-cycle pulses with a peak power up to 60 MW are generated in the range of central wavelengths tunable from 5.9 to 6.3 μm.
我们确定了一种物理场景，即自由传播的中红外脉冲可以被压缩到接近光场周期的脉冲宽度。通过在正常色散、高度非线性的半导体材料中利用自聚焦辅助光谱展宽，然后在反常色散区域进行脉冲压缩，在1 kHz重复频率下实现了波长范围从4.2到6.8μm的可调谐少周期脉冲的产生，其中通过调整反常色散组件的总厚度来精细调节色散诱导的相移。在中心波长从5.9到6.3μm可调的范围内产生了峰值功率高达60 MW的亚二周期脉冲。
