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Why in industry they use 2 source of laser to find focal position?

marvelsferb7

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Apr 28, 2020
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Hello everybody. I’m having a project about find focal position of laser’s source. As far as I known we just need 1 source and some mirror to find it. But when I’m searching in youtube I saw a industry laser cutting and they use 2 source: one go through a cross mask and one just go through a mirror. So I wonder why we need 2 source to do it? Thank you! And sorry English is not my main language so it’s might be some mistake here :(
 




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