Laser modulation and demodulation

[system]

Hi eveyone!

i have some basic quetions about modulating and demodulating a laser.

1. can i modulate laser with an arduino (AM or FM mudulation)? if so, can someone please tell me how to do that??

2. for transmmiting data in a range of 100-200 meters, what type of modulation i would prefer (AM OR FM)?

3. what is the the frequency that suit me best for this range?

4. how the demodulation works?

5. can i demodulate with arduino?

thanks alot !

[system]

Please guys....give me some help here