IMTU there are a few more laser-based weapons; I especially didn´t like that there are no auto-fire lasers in the Traveller´s Handbook, so I thought up my own:
Laser SMG
(actually more a multi-barrel laser carbine than an actual SMG)
TL 13, Cr4000, 4 kg
RoF 0/4/20, damage 1d8
80 "rounds" per power cell, 3 kg, Cr 400
Laser Mini-Gun
(again, actually a slightly larger, multi-barrel laser rifle)
TL 13, Cr 7500, 8 kg
RoF 0/10/100, damage 1d10
200 "rounds" per power cell, 4 kg, Cr 600
Both of these weapons actually have multiple (4 and 10, respectively) smaller barrels which, individually, do a lot less damage than the single-fire variant (that is, only 1 dice), and don´t actually fire any more rapidly than usual; the weapons use staggered fire to achieve an effect similar to rapid fire, pretty much like the gatling guns did, except that the barrels don´t rotate (they don´t need to, either).
Laser SMG
(actually more a multi-barrel laser carbine than an actual SMG)
TL 13, Cr4000, 4 kg
RoF 0/4/20, damage 1d8
80 "rounds" per power cell, 3 kg, Cr 400
Laser Mini-Gun
(again, actually a slightly larger, multi-barrel laser rifle)
TL 13, Cr 7500, 8 kg
RoF 0/10/100, damage 1d10
200 "rounds" per power cell, 4 kg, Cr 600
Both of these weapons actually have multiple (4 and 10, respectively) smaller barrels which, individually, do a lot less damage than the single-fire variant (that is, only 1 dice), and don´t actually fire any more rapidly than usual; the weapons use staggered fire to achieve an effect similar to rapid fire, pretty much like the gatling guns did, except that the barrels don´t rotate (they don´t need to, either).