It was very thin just like a pc of metal sheet. I guess thickness was similar to 2~3 layer of aluminium fold.
I have took the photo but I don't konw how to post it.
I have disassembly a laser of 405nm which I find there are 4 pcs of different lens in between. One of those was like a mirror in golden colourwhich reduce cercent amount of laser intensity. Normal daylight or torch light cannot pass through it. only the blue laser can pass through.
Can anyone...