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- Jan 7, 2012
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Hey. I have some questions that I couldn't find answers which were really satisfying .
I still dont exactly know how focusing a laser really works. I have a small red diode and a collimator both from a dvd burner. what is the best way to find out how to focus it? I mean yeah i can point it on a piece of paper and move the lens back and forth until the dot is as small as possible. but this way I only find out how to focus to the exact point where the papte is. How does focusing to infinity work? and how can I calculate the distance of the focal point from the distance of lens and source?
I still dont exactly know how focusing a laser really works. I have a small red diode and a collimator both from a dvd burner. what is the best way to find out how to focus it? I mean yeah i can point it on a piece of paper and move the lens back and forth until the dot is as small as possible. but this way I only find out how to focus to the exact point where the papte is. How does focusing to infinity work? and how can I calculate the distance of the focal point from the distance of lens and source?