# this script shows how to create a custom time signal

#####################################################
# specify signal

  t        = linspace(0,150000e-15, 40000);
  lc = 1430.94e-9; # wavelength
  w_center = (c/lc)*2*pi; 
  delta_t  = 30e-15;
  offset1   = 100e-15;

  # define amplitude and phase
  amp = (t < offset1)*exp(-0.5*(t-offset1)^2/delta_t^2) + (t >=offset1);
  phase = -w_center*t;

  # set the signal for the desired source
  setsourcesignal("pump",t,amp,phase,c/lc,0);