Generation and complete characterization of intense mid-infrared ultrashort pulses
Generation and complete characterization of intense mid-infrared ultrashort pulses
复制标题
强中红外超短脉冲的生成和完整表征
DOI：
10.1364/josab.23.000332
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发表时间：
2006
影响因子：
1.9
通讯作者：
M. Joffre
中科院分区：
文献类型：
--
作者：
C. Ventalon;J. Fraser;J. Likforman;D. Villeneuve;P. Corkum;M. Joffre
利用差频混频(DFM)技术，在GaS晶体中获得了能量在5~14微焦耳范围内可调谐的强中红外脉冲。在CdSe晶体中通过DFM获得了更长的波长(最高可达18微米)。然后使用各种技术对红外脉冲进行表征：使用傅里叶变换光谱仪测量光谱，然后对其进行修改以确定干涉二阶自相关。使用相同的设置测量电场光谱相位，从而导致对中红外脉冲的完全表征。用时间域零差光学技术测量光谱相位，用时间域干涉法代替光谱干涉法进行直接电场重建。实验测得的脉冲宽度为100fS，接近变换极限。
Intense mid-infrared pulses tunable between 5 and 14 µm with pulse energies of several microjoules were generated by difference-frequency mixing (DFM) in a GaSe crystal. Longer wavelengths (up to 18 µm) were achieved by DFM in a CdSe crystal. The infrared pulses were then characterized using various techniques: The spectrum was measured using a Fourier-transform spectrometer, which was then modified to determine the interferometric second-order autocorrelation. The electric field spectral phase was measured using the same setup, thus leading to a full characterization of the mid-infrared pulses. The spectral phase was measured using the time-domain homodyne optical technique for spectral phase interferometry for direct electric field reconstruction, where spectral interferometry was replaced with time-domain interferometry. The measured pulse duration was 100 fs, nearly transform limited.