Hi Say I am looking at a linear laser cavity consisting of a gain medium filling the *entire* cavity, please refer to the attached picture. The cavity will have standing waves in it, which will result in spatial hole burning of the gain medium at the antinodes of the optical field. Say the intracavity field starts out by being P-polarized at point A. Then it propagates to point B, where I put a device that changes the polarization to S. Then it propagates back to point where, where a device makes it P-polarized again, etc.. Assuming the gain-medium is birefringent, this should in principle minimize spatial hole burning, right? Because the optical path length of P- and S-polarized beams are different, so the standing-wave pattern would also change as well? Best, Niles.