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Date: Fri, 12 Oct 2012 13:18:12 -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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On Wednesday, 10 October 2012 22:52:41 UTC+1, Henry Gomersall wrote:
>
> On Wed, 2012-10-10 at 13:57 -0700, Hugo Vincent wrote: 
> > That's a frequency-tripled Nd:YAG laser emitting in the UV spectrum 
> > (about 30x shorter wavelength than these 10.6 micron far-IR lasers). 
> > Copper absorbs that wavelength fairly efficiently, whereas it will 
> > almost perfectly reflect the far-IR radiation of these (and all other 
> > CO2) lasers. You can however accurately and cleanly cut and structure 
> > epoxy resin, so if you have a way of obtaining resin-only PCB 
> > laminates without any glass fibres in them you can laser structure and 
> > drill them with a CO2 laser. But typically resin-only PCBs are very 
> > high density "HDI" boards that cost so much you won't want to put them 
> > in the laser... 
> > 
> http://blog.makezine.com/2007/01/22/how-to-use-a-laser-to-etc/ 
>
> In the comments, Shane from LPKF claims the S is an IR laser. That's not 
> to say it isn't different in some other way, or they have another fancy 
> trick they're using... 
>
> hen 
>
 
Turns out I was wrong, it's a 1064nm near-IR laser 
(http://mwrf.com/test-and-measurement/laser-based-system-creates-fast-prototypes): 
Nd:YAG without the frequency-tripling crystal. Still vastly more expensive 
than a CO2 laser...

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? :-)

H

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<br><br>On Wednesday, 10 October 2012 22:52:41 UTC+1, Henry Gomersall  wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">On Wed, 2012-10-10 at 13:57 -0700, Hugo Vincent wrote:
<br>&gt; That's a frequency-tripled Nd:YAG laser emitting in the UV spectrum
<br>&gt; (about 30x shorter wavelength than these 10.6 micron far-IR lasers).
<br>&gt; Copper absorbs that wavelength fairly efficiently, whereas it will
<br>&gt; almost perfectly reflect the far-IR radiation of these (and all other
<br>&gt; CO2) lasers. You can however accurately and cleanly cut and structure
<br>&gt; epoxy resin, so if you have a way of obtaining resin-only PCB
<br>&gt; laminates without any glass fibres in them you can laser structure and
<br>&gt; drill them with a CO2 laser. But typically resin-only PCBs are very
<br>&gt; high density "HDI" boards that cost so much you won't want to put them
<br>&gt; in the laser... 
<br>&gt; 
<br><a href="http://blog.makezine.com/2007/01/22/how-to-use-a-laser-to-etc/" target="_blank">http://blog.makezine.com/2007/<wbr>01/22/how-to-use-a-laser-to-<wbr>etc/</a>
<br>
<br>In the comments, Shane from LPKF claims the S is an IR laser. That's not
<br>to say it isn't different in some other way, or they have another fancy
<br>trick they're using...
<br>
<br>hen
<br></blockquote><div>&nbsp;</div><div>Turns out I was wrong, it's a 1064nm near-IR laser (http://mwrf.com/test-and-measurement/laser-based-system-creates-fast-prototypes): Nd:YAG without the frequency-tripling crystal. Still vastly more expensive than a CO2 laser...</div><div><br></div><div>I have to say, I didn't realise Cu&nbsp;absorbed&nbsp;efficiently at 1064nm... near-IR high power diode lasers are relatively cheap on eBay, who wants to try building one of these? :-)</div><div><br></div><div>H</div>
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