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hello lets say somebody is using a powerful burning laser , burning stuff at his backyard . if i'm located 100m away , but using binoculars and look directly at his laser dot burning stuff , should i wear safety goggles? tnx

most of the beam expanders are rated at 500mW/cm2 , what does it mean? also , any drawbacks using expander with multimode diodes ? any other ways to lower the beam divergence? thanks

hello guys , i'm looking for a way to transfer heat energy to a distance of around 100m . the heat collector would be around 1cm x 1cm . the laser should be able to heat the collector with as much energy as possible , i would say 100 - 200 degrees celcius or better , but not too hot to burn or...