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Determining Appropriate Focal Length
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[QUOTE="Tom.G, post: 5750418, member: 581973"] From the LASER spec sheet, look up the beam diameter and the beam divergence angle. From these, calculate where a point would have to be to match the listed values. Note that the beam from a bare diode laser is elliptical, not circular; i.e. there is a lot of astigmatism. Some, not all, prepackaged diode lasers have a built-in correction lens to yield a somewhat circular beam. [/QUOTE]
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Determining Appropriate Focal Length
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