The wookieepedia entry on masers answers that question.
Yes, a lightsaber will deflect a maser bolt. However, the maser bolt's kinetic energy may be enough to knock the saber out of the user's grasp or otherwise throw the blade about.
1) Rayel Olaneko
2) http://www.thestarwarsrp.com/forum/s...-Rayel-Olaneko
3) Sith Order
4) Acolyte
Approved as acolyte. Nice to see such a young char, usually people don't try that. Make sure you play him to his age and not overly wise for his years.