CPowerListener
    For CW Beams 
      
  hFig2 = figure('Position', [100, 100, 1400, 800], 'Color', [0.8, 0.8 ,1.0]);
  set(hFig2,'Renderer','zbuffer');
  lfigure2 = CListenerFigure([1 1], hFig2);
  
  hPowerListener = CPowerListener(caColor);
  hPowerListener.setRefractiveIndex(1.6*[1 1 1]); % more or less
  hPowerListener.placeOn(lfigure2, [1]);
  hPowerListener.setPlotType(@plot);
  hPowerListener.setPlotAtEvery(iPlotAtEvery);
  stepper.addListener(hPowerListener);