Controlling the carrier-envelope phase of few-cycle focused laser beams with a dispersive beam expander.
Controlling the carrier-envelope phase of few-cycle focused laser beams with a dispersive beam expander.
复制标题
使用色散扩束器控制少周期聚焦激光束的载波包络相位。
DOI：
10.1364/oe.16.022090
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发表时间：
2008
期刊：
影响因子：
3.8
通讯作者：
M. Porras
中科院分区：
文献类型：
--
作者：
C. Zapata;M. Porras
本文报道了一种在色散介质中以可控波形聚焦少周期激光脉冲的方法。通过对超短光束的空间色散进行整形，获得了扩展聚焦深度的载波包络相位的平稳性。一个可调的群速度是局部调整，以配合规定的相速度在焦点。提出了一种混合衍射-折射透镜系统，在方便的宽带调制下驱动波场到浸没显微镜物镜。数值模拟证明了该色散扩束器在定位上的鲁棒性。
We report on a procedure to focalize few-cycle laser pulses in dispersive media with controlled waveform. Stationarity of the carrier-envelope phase for extended depth of focus is attained by shaping the spatial dispersion of the ultrashort beam. An adjustable group velocity is locally tuned in order to match a prescribed phase velocity at focus. A hybrid diffractive-refractive lens system is proposed to drive the wavefield to an immersion microscope objective under convenient broadband modulation. Numerical simulations demonstrate robustness over positioning of this dispersive beam expander.