The key to get the three star mastery easily in this stage is to depend on your first shot. Your goal is to push the metal blocks to the middle so that the lasers can bounce off them.
Launch the big bird into the blocks to move those metal blocks.
First Shot Result
The lasers should be able to kill the majority of the pigs. You will then be ready to launch your next laser shot bird.
Launch into the position depending on whatever pig is left over.
Second Power Activation Point
Activate your laser gun and pick off the rest of the pigs.
Second Shot Result
The three star mastery is yours if you are able to kill all the pigs with your second shot.