Will Raman photon counts/Spectral resolution increase if laser beam becomes parallel? Most Raman spectrometer has the laser converging into focus with the sample at center like this.

Usually how many millions of H2O atoms will be covered by one spot size?
What will happen if the laser beam would be made parallel instead of converging. Will it increase the counts of the spectrum? Will it improve the spectral resolution? Or will both become worse?
Water Raman:
Spectral resolution is not dependent on the laser intensity. It is determined by the state of the sample ( gas, liquid or solid) and more importantly by the components of the instrument itself. For example, what is the slit width anf the number of lines on the grating? What type of detector is there? If it is charged coupled device (CCD) then the spectral resolution will also be dependent on it.