RE: SLA-250 Laser replacement

From: Stahlhut, Todd A. (
Date: Tue Sep 30 1997 - 14:37:00 EEST

We use he Coherent lasers through 3D.
From: Brian Bauman
To: Stahlhut, Todd A.; rp_send_mail
Subject: RE: SLA-250 Laser replacement
Date: Monday, September 29, 1997 3:11PM


Are you talking about Coherent or Liconix lasers?

 -----Original Message-----
From: Stahlhut, Todd A. []
Sent: Monday, September 29, 1997 2:13 PM
To: rp_send_mail
Subject: RE: SLA-250 Laser replacement

Our last three lasers have lasted over 6000 hours. I don't know what
the exact reasons are but have a couple of ideas.

        1) We are in a clean room - Don't think this is a major reason but
the constant temp and low dust certainly don't hurt.

        2) Uninterruptable power supply. Before we added this we would have
lasers dying at or before 2000 hours - after this was put on a few years
ago they have lasted upwards of 4000. Our last one lasted 6500 hours
and was in the mid 20's when it died.

        3) We don't turn our laser off if at all possible - only if we know it
is going to be down for more than a few days.

I feel that the major reasons we have enjoyed long laser life is reasons
2 and 3.

Regards, Todd Stahlhut

>Subject: SLA-250 Laser replacement
>Date: Monday, September 29, 1997 1:04PM

> Does anyone know if there are any other lasers for the SLA-250 ?

> The 40 mW Omnichrome unit that we have seems to last about 2000 hrs.
> At that time it starts loosing power rapidly (less than 25 mW) and the
> build time suffers greatly. The remelt process helps but it never
> returns to the original 32 - 36 mW.

> I have heard of a 70 mW (!!!!!?????) Liconix but how reliable is it,
> how dependable is it?, price, service etc.?

> Any help would be appreciated

> Andy Messina
> The Boeing Company

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