Hello! What is the best way to mode match a cavity in practice? I know the laser spot size before it enters the cavity, but I don't know what the beam spot size should be inside the cavity, so I am not sure how I should adjust the size of the laser spot such that it matches the one that builds up inside the cavity. I tried to just maximize the power output from the cavity several times, but every time the mode leaving the cavity is a higher order one (not the T00 that I want), so I am not sure how to proceed. Can someone advise me on this? Thank you!