Shoot the laser and pause the game while the laser is still visible. Then, press Square, X, Square, Circle, Triangle, Circle, Triangle, Select. Now enter one of the following codes:

Invincibilty

Press Square, X, Triangle.

Super laser

Press Circle(2), X, Circle, Triangle, Square.

Smart bomb

Press Square, X, Circle.

Refuel

Press Circle, X, Square.

Completed current mission

Press Square, X, Square(2), Circle.