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Old 07-21-2016, 07:43 PM #1
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Default using a laser to print circuit boards?

So, I'm working on a way to produce PCBs for small jobs, and I thought that lasers might be a good way to go, as etching seems to be very difficult from small traces, needed for many microcontrollers.

I started by searching the absobance spectrum of copper, as the metal itself is very reflective. A quick search turned out that the absorbance of copper rests right around 800nm. Thus I came to the conclusion that an 808nm etching diode would probably be best.


My question to you, is weather or not the laser qould actually remove material, or if the copper will take on the heat? 808nm lasers are very focusable,and I plan on having an estimated power of 360KW/cm2 (40W diode at .112mm2 dot)..

I've worked with many lasers before, ranging from IR to UV, and I know enough safety to know that 808 modules are generally focused beasts.

also see: Best Laser for Melting Copper Powder?


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Old 07-21-2016, 08:08 PM #2
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Default Re: using a laser to print circuit boards?

I'm sure you could direct etch just fine - but the easiest way would be to use some sort of coating on the board - either a paint or some sort of photo-sensitive layer. It's been done those ways plenty of times.

Laser etched PCB production | Hackaday

Exposing PCBs with a home made laser printer | Hackaday

Laser-Based PCB Printer | Hackaday

Exposing PCBs with a home made laser printer | Hackaday

https://web.archive.org/web/20120119...eonarudo.info/

Not sure how well 40W of CW power at 808nm would work, something Q-switched would probably work better - that'd ablate the copper. May run into issues with the substrate/surrounding copper melting if you go too slow with CW.


I take it you're looking at a fibre coupled 808nm diode? Keep in mind a 40W bar isn't going to give you the beam performance you want otherwise.
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Last edited by diachi; 07-21-2016 at 08:10 PM.
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Old 07-21-2016, 08:20 PM #3
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Default Re: using a laser to print circuit boards?

Quote:
Originally Posted by diachi View Post
I take it you're looking at a fibre coupled 808nm diode? Keep in mind a 40W bar isn't going to give you the beam performance you want otherwise.
I'm planning on using a lens to focus the laser based on the substrate. I'm reading up on pulsed abalation of copper now, but I'm having no luck on beam abalation.
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Old 07-21-2016, 08:23 PM #4
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Default Re: using a laser to print circuit boards?

Quote:
Originally Posted by tuskiomi View Post
I'm planning on using a lens to focus the laser based on the substrate. I'm reading up on pulsed abalation of copper now, but I'm having no luck on beam abalation.

Could you give us a little more detail on your planned optical setup?
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
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515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
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633nm | HeNe | 6mW
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650nm | Sanwu Laser Pocket Series | 200mW Metered
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Old 07-21-2016, 08:29 PM #5
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Default Re: using a laser to print circuit boards?

Quote:
Originally Posted by diachi View Post
Could you give us a little more detail on your planned optical setup?
like a schematic, a technical drawing, a few words? what would be most useful?
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Old 07-21-2016, 08:32 PM #6
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Default Re: using a laser to print circuit boards?

Quote:
Originally Posted by tuskiomi View Post
like a schematic, a technical drawing, a few words? what would be most useful?

A drawing would be good if you have something handy - but words would work too

Which diode? Which Lens(es)?

Might need to fire up the ~20W 808 and see what it does to some blank PCB - fibre coupled so I can get down to a reasonably tight spot with a short FL lens.
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<

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Old 07-23-2016, 01:40 AM #7
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Default Re: using a laser to print circuit boards?

I am curious how powerful of the laser you will need in order to etch the copper.

Last edited by Geeker; 07-23-2016 at 01:40 AM.
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