Vaporising doesn’t help (the mass hasn’t changed and neither has the velocity). Deflection by vaporising a very small part of the object can work, if you can s

Vaporising doesn’t help (the mass hasn’t changed and neither has the velocity). Deflection by vaporising a very small part of the object can work, if you can spot it coming and hit it in time. Assuming you can somehow detect a 1cm piece 1km away, you have approximately 10ms to accurately apply enough power to deflect it.