Homebrew PCBs

Can your laser ablate the copper or just hardens the resist?

If the former, I need to buy some blue lasers to try.
On Thu, Nov 12, 2009 at 2:46 PM, Volkan Sahin <v_sahin@...> wrote:

>
>
> I've a working prototype. I'm using 150mw 405nm blue ray laser diode.
> Without complicated optics I can get ~3 mil trace width/space. Currently,
> I'm using  Dichromated PVA  based homemade photoresist.  The problem is
> without  polygon mirror scanner, it is very slow but result is impressive.
> The exposure time required for  1.5 mil spot is ~20 microseconds.
> Volkan
>
> --- On Thu, 11/12/09, lmri2071 <lmri2071@... <lmri2071%40yahoo.com>>
> wrote:
>
> From: lmri2071 <lmri2071@... <lmri2071%40yahoo.com>>
> Subject: [Homebrew_PCBs] Making PCB using these new 405nm LASER Diodes
> To: Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>
> Date: Thursday, November 12, 2009, 8:38 AM
>
>
>
>
> I had this idea about seven years ago. But at that time the Laser Diodes
>
> of 405nm were impossible to obtain (USD$4000). Since last year, I have
>
> taken this idea again, because now one can buy those laser diodes around
>
> USD$40 (85mW) in eBay. I saw in web (youtube) some germans guys
>
> experimenting with this, but I have not see the results. Also I read
>
> about a french engineer who made some experiments with UV LEDs coupled
>
> with a fibre optic. I have a Polish paper which expose the use of this
>
> idea to get 50um (2 mils) clear cut beatiful traces, but they use very
>
> expensive optics ( telecentric lenses, glavos and others things which
>
> are too costly for the DIYer ).
>
> Now I struggling with optics. When I get some control of the LASER beam
>
> waist, I gonna put my laser module in a CNC engraver.
>
> There are anyone working on that in this group?
>
> [Non-text portions of this message have been removed]
>
>  
>


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