Typically these burning lasers are in the infrared spectrum and it's pretty easy to block the entirety of that. Visible lasers, particularly very powerful ones

Typically these burning lasers are in the infrared spectrum and it's pretty easy to block the entirety of that. Visible lasers, particularly very powerful ones, tend to only fall in a handful of wavelengths due to the way they work so it's less of a problem than it sounds like it is.