In article ,
Andrew Sarangan wrote:

Not all lasers are polarized. You can also get unpolarized laser emission.

Yes, but aren't the upolarized lasers quite weak? My only real
experience with lasers was messing around with them in college physics
classes and all the different laser beams could be blocked quite easily
with polarized glass.

Obviously if the laser is strong enough to burn through the glass then
it won't work, but those lasers are not readily available

LG