There would be many factors involved. Mainly the intensity of secondary light source that is hitting the blaster bolt or blade, distance to surface that a potential shadow would be cast upon, the direction of travel from the light source (is it focused in one direction or being cast out in all directions), as well as the frequency of the light from the source, the blade, and/or the blaster bolt.
but if all conditions are perfect, yes a shadow would/could be cast. With this being about non-existent objects, there are two many unknowns to go into the exact mathematical formulas for determining the exact factors required.