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Laser for sintering of metal powder

Posted by Nathan_T 
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Nathan_T
Re: Laser for sintering of metal powder
October 04, 2019 06:45AM
Viktor, I also have question about focusing of laser . As I can see, you used self-made focal lens. What lens did you use?
Is it better to use system "laser diode - fiber - focal lens" (not to mount laser diode on bridge of CNC machine, mount only focal lens)?
Did you ever take laser diodes and they worked not at full power?
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VDX
Re: Laser for sintering of metal powder
October 04, 2019 07:05AM
... different lenses - sometimes "random finds", sometimes special PMMA lenses designed for IR-laserdiodes, sometimes optics for NdYAG- or fiber-lasers ...

Fiber coupling helps to separate the cooling from moving ... but reduces the power for the "losses" at fiber entry and output.

"not at full power" - do you mean faulty diodes?

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
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Nathan_T
Re: Laser for sintering of metal powder
October 08, 2019 10:24AM
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VDX
"not at full power" - do you mean faulty diodes?

Yes, you understood me correctly.
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VDX
Re: Laser for sintering of metal powder
October 08, 2019 02:08PM
... my high power diodes are mostly salvaged from broken "diode-pumped lasers" - while the main laser is "exploded" for overpowering or back-reflexion, the pumping diodes are mostly OK ... until now only then not easy usable (but could be modified/reused too), when the attached fiber was burnt too short ...

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
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Nathan_T
Re: Laser for sintering of metal powder
February 26, 2020 04:51AM
Sorry, Victor, but I never got around to buy that laser (M1F4S22-808.3-50C-SS2.1 - 50 watts of power).
I find another M1F2S22-976.2-130C-IS34.2 (wavelength 975,7 nm).
Is 3.1nm line width obtained when using a collimator with this laser diode? How do you think?
The power supply scheme is no different than what you provided. But I attached it to this post.
Does HRP-450-7.5 (voltage adjust range from 6.8V to 9V) power supply suit to this diode?
Is it possible to initially calculate voltage drop across the regulator?
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Attachments:
open | download - M1F2S22-976.2-130C-IS34.2.pdf (59.3 KB)
open | download - Power supply scheme.pdf (43 KB)
VDX
Re: Laser for sintering of metal powder
February 26, 2020 05:04AM
... fokussing with a lens is less problematic, than with shorter wavelengths -- did this with glass lenses without any AR coating - AR coating for NIR (800 - 1100nm) would be optimal.

You need 6 Volts for the diode and 2-3 Volts for the regulating -- so 9V from the PS ist OK ...

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
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Nathan_T
Re: Laser for sintering of metal powder
March 02, 2020 10:40AM
This is strange, but I can't find lens with AR coating in sale. Using lenses is better because energy isn't lost (almost) compared to a collimator?
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VDX
Re: Laser for sintering of metal powder
March 02, 2020 12:19PM
... a collimator is mostly built with 2 or 3 lenses - so without correct AR coating much more losses than a single lens.

For my first IR-diode with 9 Watts @975nm I found some small uncoated lenses in an old "optics" kit -- they worked pretty well cool smiley

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
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VDX
Re: Laser for sintering of metal powder
March 02, 2020 12:23PM
... by the way -- where are you located? ... have a bunch PMMA lenses with 9.5mm focal distance, which I'm using for IR-diodes above 30 Watts output power.

Got them from imos-gubela -- but they sell only batches ... [www.imos-gubela.de]

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
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Pop Alexandra
Re: Laser for sintering of metal powder
December 20, 2021 07:25AM
Quote
MKSA
Quote
Nathan_T
I think to connect laser diode according this scheme.
Using two parallel mosfets IRLB3034PbF:
[www.mouser.com]

For sure you will get powerful sparks of light but not from the laser diode ! smiling smiley
Yeah, that pretty much makes sense. Thanks for sharing!
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