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Old 04-07-2014, 04:58 PM #1
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Default Beam expander or not?

I ask because I want to make a fixed laser on an engraver and am considering using a larger focal lens than the normal 6mm ones. would it be better to use a beam expander, or just use 2 focus lenses? The first would not focus tight, just use it bring the beam in and make it round. I want to use either the 9mm 3W 450 or the 16x 1W blu ray I have coming for this. I have purchased several of these: New GSI Lumonics Laser Scanning Galvo Mirror Linear Motion Scanner Motorized | eBay
This could be used to vary the focal plane of the beam.

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Old 04-07-2014, 07:06 PM #2
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Default Re: Beam expander or not?

I think a normal focusing lens will do the job. A beam expander would be anyway to big for engraving.
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Old 04-08-2014, 09:20 PM #3
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Default Re: Beam expander or not?

You only need an expander if you want good divergence -- at the cost of beam width -- over long distances. For an engraver, you'd just want to focus on the plane of interest.
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Old 04-09-2014, 12:46 PM #4
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Default Re: Beam expander or not?

You guys are right, I guess I was thinking more about cutting than engraving which isn't going to happen with the powers this will be at.
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