KreAture,

        In the article cited, look under Program Plans, 3rd bullet down:  It
refers to 10 single mode lasers with a total power out of 1 KW.  From
this, I assumed that each fiber had 100 watts in it. In my experience, a
single mode fiber uses a core of 8-9 um.  What is your understanding of
the comment in the article below?

http://www.darpa.mil/tto/programs/hpfl.html

Larry


Kyrre Aalerud wrote:
>
> They don't use that thin cable for such applications, but the point is that
> as long as there is little loss, power density doesn't matter.
>
>     KreAture
>
> ----- Original Message -----
> From: "Larry Reynolds" <lreynol4@EROLS.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Tuesday, February 04, 2003 10:07 PM
> Subject: Re: [ot]: laser question
>
> > Consider the optical power densities within a single mode fiber (~8 um)
> > driven with 100 watts of optical power:
> >
> >         Pd = 100/(PI*(8e-6)^2) or 497.4 trillion watts/m^2
> >
> >         egads!!!!!!!!!!!!
> >
> > Larry
> >
> >
> > Mark Perri wrote:
> > >
> > >  From this blurb, it looks like DARPA is trying to make a >100W fiber
> and
> > > eventually 100kW for "speed of light engagement."
> > >
> > > http://www.darpa.mil/tto/programs/hpfl.html

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