Propagation of ultrashort light pulse through the glass block



The light is incident to the glass block from upper right.  At a boundary between the block and air, the light splits into two parts: a refracted light which proceeds into the block and a reflected light which propagates back into the air.  The direction of the refracted light is changed according the law of refraction.  Of interest is the behavior of the pulse inside the glass block.  It is observed that the pulse front(wavefront) is perpendicular to the direction of propagation and its speed decreases. The total time of the scene is 315ps.