Abstract
We report short pulse propagation simulation data generated by 3 D+1 (x,y,z,t) code which takes into account space–time Laplacian, up to cubic term dispersion, delayed Kerr non-linearity, optical shock term and multi-photon ionization. The input phase front of the pulse is taken to be parabolic corresponding to focusing/defocusing conditions, while the intensity spatial distribution is Gaussian. The temporal pulse shape is taken to be either sech 2( t) or Gaussian type with encoded chirp phase information. We discuss various implications of tightly focused beam on bulk laser ablation (micro-machining) and super continuum (SC) generation. These include blue spectral enhancement of SC with pulse breaking into shorter pulses and detrimental effect of very short pulses on micro-machining.
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