Fixed-point generation of large high peak optical field

The propagation regularity of the laser in the 1D resonance media was studied by solving the Maxwell-Bloch equations with definite difference method. It was found that the 2p pulse would not propagate as a soliton but split if the dipole moment or the particles concentration of the resonance media was over a certain value. When two 2p pulses of different pulse widthes propagated through the resonance media, the shorter-duration pulse would catch up with the longer one. If the peak area signs of the two pulses were the same, the optical field indensity would not change obviously, it would add up and a powerful pulse with larger peak area but shorter duration would be generated. Therefore a powerful field could be generated on a fix position by adjusting the pulse width or time lapse of the