From Pulse-Front Distortions of Ultra-Intense Ultrashort Lasers to Group-Velocity Controls of X-Shape Optical Wave-Packets
Because ultra-intense ultra-short laser has a large beam in space and a short pulse in time,the spatiotemporal coupling effect,for example the pulse-front distortion,frequently appears,which leads to a separation between the pulse-front and the phase-front in space-time,such as the pulse-front tilt or curvature,and is not conducive to obtaining the expected high focused intensity.However,when this pulse-front distortion(control)is applied in the X-shape optical wave-packet,a new degree of freedom is introduced for freely controlling the group-velocity and the group-acceleration of the optical wave-packet,enabling superluminal,subluminal,accelerating,decelerating,and even dynamically-controllable group velocities.By reviewing the pulse-front distortion(control)'s adverse effects in the ultra-intense ultra-short lasers and its special performances in the X-shape optical wave-packets,we try to provide some reflections on the cross-application of the same optical phenomenon in different research directions.
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