Re: SLA basics: a question

Date: Thu Jun 19 1997 - 00:59:52 EEST

attached mail follows:

     Math maybe simple but beam width and particularly scan speed are
     functions of the power and not constant as power drops.
     Lee Humphrey
     not associated with anyone anymore

______________________________ Forward Header __________________________________
Subject: Re: SLA basics: a question
Author: at ORL-SMTP-G
Date: 6/18/97 2:40 PM

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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