I have no advice to offer but I wish you well. I hope you find something that works for you.

@unknownuser said: it becomes difficult/impossible when you want to create custom parabola/hyperbola reflectors. Draw parabola/hyperbola section? or the result of the rays of the laser ? About Gebra / Algodoo look this thread! You must be French user groups registered! (menu "setting" / User groups... up left page corner )