I suppose this is a 2 part question. I saw a neodymium YAG laser being used for UV experiments at University of Portland a long time ago. They put the yellow-green light of the YAG through a piece of (I believe if memory serves me well enough) calcite crystal and it emerged as UV. Does the calcite crystal also work for 478nm wavelength? and Is there a relatively common material that will give photon upconversion in the 478nm wavelength region?