Re: SLA basics: a question

From: Guy Allen Brady (
Date: Wed Jun 18 1997 - 22:40:05 EEST

On Wed, 18 Jun 1997 ralott@CCGATE.HAC.COM wrote:

> What is the relationship between laser power and scan time? Is it
> direct? For example, if laser power is reduced 50%, does scan time
> double?

Short answer: yes.

Long, geek-ified answer:
A scanned area needs energy dose, E to get the correct cure depth, Cd.
        E = P/(W*v)
where E is the energy dose (J/cm^2), P is laser power (J/sec), W is the
beam width (cm) and v is linear scan velocity (cm/sec). Simple math.

          G. Allen Brady -- Graduate Research Assistant
Materials Science and Engineering - The University of Michigan
2219 H.H. Dow Bldg. 2300 Hayward Street Ann Arbor, MI 48105
work: 313/936-0177 fax: 313/747-4807 email:

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