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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
Quote
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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