Is there a single optical component that will do the following? Do nothing to the horizontally polarized input, but rotate the vertically polarized input by 90 degrees, so that both beams finally emerge with the same polarization? I am looking for a single element that will replace the following arrangement. Edit : Wait, what about the second PBS? It will transmit the H ray downwards !! So basically, I need something that will do properly what the figure actually tries to do, but fails.