Without greater context, this is difficult to translate. It could mean either:
[A] A jig that is used for aligning lasers (accurately pointing the light they emit in the right direction), or
[B] A jig for aligning other objects (often used for cars, or in boat-building) that uses lasers to check the alignment.
I think [B] is far more likely, in which case Laser alignment jig is the most commonly used expression.