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Diode bar?

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konstantin

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Have anyne used a diode bar ?
Like those you find in ebay that needs to be soldered?
I have see them and have no idea what to do with them.

Some cohereng use those in arrays, how do they join the beams of the diodes?
What kind of equipment is needed to power those diodes?

For example this ebay i tem=110261917012

contains several laser diode bars like the ones standalone in this other ebay item=110263065246
isnt it?

What kind of psu is needed? Pulse modulated? What does it mean?
As you see I am a total noob when it comes to lasers.

Konstantin.
 





FrothyChimp

FrothyChimp

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Diode bars will not produce the nice laser beam you normally see. They are primarily designed for pumping solid state laser systems although there are other uses. People have used lenses to bring all the emitter outputs together and to focus them on a target for burning.

Diode bars are powered by a current controlled DC circuit usually capable of a few watts to hundreds of watts depending on the diode.
 
K

konstantin

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Can they be used in a engraving cutting system?
I am looking for alternatives to CO2 which with my budget I could only buy chinesse. With all the gambling that implies.


Konstantin
 
FrothyChimp

FrothyChimp

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with the proper application of optics and the use of fiber optics you could bring the power of the diode to a small spot. I suggest fiber coupling because the diode bars become bulky due to the metallic mass as well as the large power cables and cooling lines.
 
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konstantin

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Yeah I have seen that website, but what comes after that soldering is ?

Anyone have done something similar on this forum?



Konstantin.
 
GooeyGus

GooeyGus

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after soldering you connect your leads to the anode and cathode and power it up at the rated power. It needs to be heatsinked well.
 
K

konstantin

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What kind of PSU do these things use?

Also what kind of lenses to use ? Please provide link.

In that website zolotenin.goog.... in pics there is this "radiation" with virious arrows. Is that the diodes firing up ?
Please bear with my noobishness, hopefully you can be generous with information. I am quite clueless about this laser diode bar.

Konstantin
 
GooeyGus

GooeyGus

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To be honest, I'm pretty clueless with them as well. But basically, every diode has one of those 'bars' in it, its just already all set up.

The power supply needs to be a constant current supply, probably around 2v (if it's an 808nm bar) and the amperage depends on the individual bar. anywhere from a few mW to a few watts.

In the picture with the arrows, he is showing the direction of the radiation, which comes out from the bar.

As far as lenses, like frothy said fiber coupling would probably be the best way. Its really up to you, just imagine that 'bar' as a little diode and go from there.
 
FrothyChimp

FrothyChimp

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If it's a biggun it'll require some juice. For example the 60 W 808nm pump diode in one of our YAG laser heads requires 23A @ 18V DC.
 
GooeyGus

GooeyGus

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FrothyChimp said:
If it's a biggun it'll require some juice. For example the 60 W 808nm pump diode in one of our YAG laser heads requires 23A @ 18V DC.
Click to expand...


:eek: :eek:

Now, is that a single bar or is it an array of a bunch of them?

I'd be curious on how to set up an array like that....
 
SenKat_Stonetek

SenKat_Stonetek

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Since you are voicing your concerns over your own noobishness to the laser world, I would recommend you steer clear away from a project of this magnitude, not only for your sanity in the assembly process, but also due to the HUGE danger of exposure to near infra-red, and infra-red, and invisible radiation emanating from that diode array. A diode array is simply a LOT of individual diode chips placed in an array where their power can be concentrated for various desired outcomes. I'm not going to bemoan you your experience, but this is a daunting venture even to those that are comfortable working with high powered IR devices...
 
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konstantin

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I am new to the lasers and I am gathering all the info I can.
I am looking into making a cnc engraver in the future.
CO2 is the recommended thing for organic materials, Yag for metal.
These unmounted diode bars seems to be cheap on ebay, so I am learning what does it makes into a full setup. How much would it cost.
So far chinesse CO2 tubes are the cheapest. The psu is also needed and its high voltage one.
This diode bars use plain DC at rated values or there is something special about the PSU.


Konstantin
 
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