Xenon lamps output a broad spectrum of light all the way from UV to Infrared, so it sounds to me like you are just blocking the other wavelengths....not the same as a laser, but you haz a purty lite nowz!!!!
Nope, no way, it's just filtered flash lamp light.
Although, Of interest you CAN make a KTP crystal lase with a flash lamp according to Sam's site! They did it by exciting a green laser pointer using a cheap camera flash. Unfortunately the crystal can shatter if you put too much power in it though.