Mylar and diode lasers

Hi, I have a little Neje 3.5w 445nm laser module strapped to my cnc 3018 Pro. I have been cutting paper as a trial and then bought some mylar which it will not even come close to getting warm despite several attempts at focussing the beam.

are all diode lasers ineffective against mylar?

Looks like mylar allows the 445 nm laser to pass thru it only absorbing 16% of the power. 3.5 watts x 16% = .56 watts of cutting power.

,56 watts? even less when you consider that the 3.5w is power INPUT!

that’s blown me apart for cutting stencils with a laser then!