I certainly don't want to give the wrong people the wrong idea, but I just had a thought (it happens now and again, ya know) that I'd like to share with the experts here.
Why couldn't a laser gun record the speed of a vehicle at an extreme angle, like, say 30 degrees or even 45 degrees provided the gun "knew" exactly what the angle was? If you shot a vehicle traveling at 45 degrees to you and you knew that it was at exactly 45 degrees couldn't the processor in the gun make the correct speed calculation?
This would obviously make laser jamming useless unless the jammer could somehow be made to respond with a beam of it's own at the correct angle.
The origin of my idea was the "lead computing gun sight" introduced by the allies for use in fighter aircraft at the end of world war II. They made deflection (angled) shooting practical when engaging enemy aircraft even if the pilot was not a naturally gifted and experienced ace.
If it would work I sure hope no one on the "other side" thinks of it!