Date: Sun, 14 Oct 2012 05:02:09 -0700 (PDT)
From: Hugo Vincent <hugo.vinc...@gmail.com>
To: cammakespace@googlegroups.com
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Subject: Re: [makespace] HPC Lasers for makespace
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The diodes I was thinking of were more like this:
http://www.ebay.co.uk/itm/20-watt-Laser-diode-coherent-USA-fully-assembled-TEC-cooling-power-supply-/170912518185?pt=LH_DefaultDomain_0&hash=item27cb2e1029

(the actual laser module, the gold coloured box under the lid, sometimes 
sell by themselves for around US$200 - about 5 sold earlier in the year)

Given the LPKF laser is 20W continuous, but pulsed at higher energy - 
instantaneous peak power might be hundreds or even thousands of watts - I 
guess you'd need something more like this (rather than the 1W diodes) to 
get anywhere with ablating copper. Convieniently, almost all these diode 
modules seem to be fibre coupled, which makes beam delivery "simple". 

Any optics/laser experts on the list?

H

On Friday, 12 October 2012 23:49:52 UTC+1, Henry Gomersall wrote:
>
> On Fri, 2012-10-12 at 22:34 +0100, Henry Gomersall wrote: 
> > On Fri, 2012-10-12 at 22:23 +0100, Henry Gomersall wrote: 
> > > On Fri, 2012-10-12 at 13:18 -0700, Hugo Vincent wrote: 
> > > > I have to say, I didn't realise Cu absorbed efficiently at 
> > 1064nm... 
> > > > near-IR high power diode lasers are relatively cheap on eBay, who 
> > > > wants to try building one of these? :-) 
> > > 
> > > I do! I presume the difficulty is in going to be precisely 
> > collimating 
> > > the beam and directing it nicely. Still, there are lots of us, and 
> > > we're 
> > > clever... 
> > 
> > There is stacks of literature on combining beams to create a higher 
> > power source. A bit of careful optical bench work with some laser 
> > printer optics and a board conveyor might be enough. 
>
> Ok, some of those laser diode modules are kinda scary... 1W laser 
> output! 
>
> hen 
>
>
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The diodes I was thinking of were more like this:<div>http://www.ebay.co.uk=
/itm/20-watt-Laser-diode-coherent-USA-fully-assembled-TEC-cooling-power-sup=
ply-/170912518185?pt=3DLH_DefaultDomain_0&amp;hash=3Ditem27cb2e1029</div><d=
iv><br></div><div>(the actual laser module, the gold coloured box under the=
 lid, sometimes sell by themselves for around US$200 - about 5 sold earlier=
 in the year)</div><div><br></div><div>Given the LPKF laser is 20W continuo=
us, but pulsed at higher energy - instantaneous peak power might be hundred=
s or even thousands of watts - I guess you'd need something more like this =
(rather than the 1W diodes) to get anywhere with ablating copper. Convienie=
ntly, almost all these diode modules seem to be fibre coupled, which makes =
beam delivery "simple".&nbsp;</div><div><br></div><div>Any optics/laser exp=
erts on the list?</div><div><br></div><div>H<br><br>On Friday, 12 October 2=
012 23:49:52 UTC+1, Henry Gomersall  wrote:<blockquote class=3D"gmail_quote=
" style=3D"margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding=
-left: 1ex;">On Fri, 2012-10-12 at 22:34 +0100, Henry Gomersall wrote:
<br>&gt; On Fri, 2012-10-12 at 22:23 +0100, Henry Gomersall wrote:
<br>&gt; &gt; On Fri, 2012-10-12 at 13:18 -0700, Hugo Vincent wrote:
<br>&gt; &gt; &gt; I have to say, I didn't realise Cu absorbed efficiently =
at
<br>&gt; 1064nm...
<br>&gt; &gt; &gt; near-IR high power diode lasers are relatively cheap on =
eBay, who
<br>&gt; &gt; &gt; wants to try building one of these? :-)
<br>&gt; &gt;=20
<br>&gt; &gt; I do! I presume the difficulty is in going to be precisely
<br>&gt; collimating
<br>&gt; &gt; the beam and directing it nicely. Still, there are lots of us=
, and
<br>&gt; &gt; we're
<br>&gt; &gt; clever...=20
<br>&gt;=20
<br>&gt; There is stacks of literature on combining beams to create a highe=
r
<br>&gt; power source. A bit of careful optical bench work with some laser
<br>&gt; printer optics and a board conveyor might be enough.=20
<br>
<br>Ok, some of those laser diode modules are kinda scary... 1W laser
<br>output!
<br>
<br>hen
<br>
<br></blockquote></div>
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