Re: Beam expander and focusing system for scanning head

From: Ben Buckner (tarchonidontwantspam_at_sbcglobal.net)
Date: 10/05/04 

Date: Tue, 05 Oct 2004 03:12:11 GMT

Depending on certain critical parameters, scan speed, scan angle, size
tolerance, spot size, working distance, etc., there can be ways to do
pre-focused flat-field scanning, though I would suggest that changing
the focus with a moving lens is going to be one of the slowest
approaches to the problem. I've never seen anyone even try it, probably
with good reason.
Try the OSA's Handbook of Optics v II ch. 19 (Scanners). Always a good
place to start.

Ben B.

Marco wrote:
> I'm working with a laser scanning head and I need to substitute its
> post-focusing (F-theta) system
> with a pre-focusing one, with integrated beam expander and focusing
> lenses that change its the focal
> length on the fly moving a lens inward or outward from the others, to
> keep a constant spot size over
> the entire field. Where can I find out some configurations or can
> anyone explain me how to? I'm
> moving now my first steps into optics, with books and posts.
> Thanks, Marco

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