Quote Originally Posted by bwang View Post
PSST doesn't seem to do V-folds, but modeling a 55cm cavity with a 50cm RoC mirror and 20 cm RoC mirror tells me it is stable.
Eh, whats a sign convention among friends.

Was it in the center of the stable region or along the edges? Along the edges means you sweat for a few hours during alignment. If its on the edges, consider doing the stability criterion math by hand to see how close it really is.

Steve