what is Laser energy lost during transmission??

[asdegypt]

How much is the loss in the amount of laser energy during transmission across great distances?
:san: :san: :san:
How the amount of energy required for the laser beam travels to the surface of the moon?
How will energy beam on the surface of the moon there?
thanks

 

[Rifter]

Laser Pointer At moon

 

[LtKernelPanic]

When measuring the distance from the earth to the moon the beam is about 4 miles in diameter when it hits the moon which sounds huge until you realize you're trying to hit a target about 3 feet /1m square from ~240,000 miles/386,000km away. Out of every 10 million photons that make it to the reflector only one makes it back to earth. I'll leave the math to you.

 

[Things]

Oh, oh, I know a thread about just this! http://laserpointerforums.com/f44/how-laser-energy-loss-over-distance-90614.html

Oh, right.