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View Poll Results: Which one ?
Beam Expander 1 25.00%
No Beam Expander 3 75.00%
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Old 07-17-2017, 01:40 PM #1
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Question NUBM44 beam divergence

If wanting to achieve maximum efficiency for eg. burning/cutting/engraving which would be a better choice:

1. To get a beamexpander which would make less power come out of the lens but it would be focused on a smaller area.

Or

2. To leave it with just a g2 glass lens which would have a bigger dot but more power towards the surface which we are pointing towards.

Im going to guess that it`s probably better to get a beamexpander.
What do you guys say?


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Old 07-17-2017, 02:29 PM #2
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Default Re: NUBM44 beam divergence

Well that depends, if you're specifically asking about efficiency, then you'd get more output power with roughly the same amount of precision (depending on distance I guess) without the expander, it's my understanding that more optics has an effect of more power loss, albeit a pretty small loss.
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Old 07-17-2017, 04:02 PM #3
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Default Re: NUBM44 beam divergence

Quote:
Originally Posted by ProleX1337 View Post
If wanting to achieve maximum efficiency for eg. burning/cutting/engraving which would be a better choice:

1. To get a beamexpander which would make less power come out of the lens but it would be focused on a smaller area.

Or

2. To leave it with just a g2 glass lens which would have a bigger dot but more power towards the surface which we are pointing towards.

Im going to guess that it`s probably better to get a beamexpander.
What do you guys say?
There's a third choice perhaps. A wider lens with a longer focal length. Let the beam expand a little. With the wider lens you'll be able to concentrate the laser light into a smaller spot.
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Old 07-17-2017, 04:08 PM #4
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Default Re: NUBM44 beam divergence

When you increase the width of the input beam, it is true that the beam waist decreases. But be aware that so does the Rayleigh length. This means that more care will have to be taken into focusing the laser. Also bare in mind that you are using multimode diodes so even when expanded these won't focus too great.



I voted no expander as I don't think it is worth it for laser your purposes. You'll have lower tolerance on focusing and you won't get as great as a spot as you are probably hoping for. The expander will help, but better to stick with the G2 IMO.
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Old 07-17-2017, 04:45 PM #5
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Default Re: NUBM44 beam divergence

I don't get it!!!? I've tried to post a poll several times and it doesn't work for me how do I do it? Thanks everyone.
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Old 07-17-2017, 05:15 PM #6
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Default Re: NUBM44 beam divergence

Quote:
Originally Posted by ProleX1337 View Post
If wanting to achieve maximum efficiency for eg. burning/cutting/engraving which would be a better choice:

1. To get a beamexpander which would make less power come out of the lens but it would be focused on a smaller area.

Or

2. To leave it with just a g2 glass lens which would have a bigger dot but more power towards the surface which we are pointing towards.

Im going to guess that it`s probably better to get a beamexpander.
What do you guys say?
Have a look at the excellent and relatively reasonable priced engraving and cutting head these guys in Poland make--excellent quality and products: Engraving laser heads - Opt Lasers

Last edited by Encap; 07-17-2017 at 09:58 PM.
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Old 07-17-2017, 08:43 PM #7
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Default Re: NUBM44 beam divergence

I don't get the reasoning behind using a poll to get people's opinions on a question of either or. A simple thread asking for an opinion would work much better and a tally of the poll results would never get you the correct answer you are looking for. If you are using the NUBM44 for very close work, it should be focused well enough to cut through thin metal. If you want to use it at a farther distance, the answer will depend on how far away is your target.
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Old 07-17-2017, 10:04 PM #8
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Default Re: NUBM44 beam divergence

Quote:
Originally Posted by paul1598419 View Post
I don't get the reasoning behind using a poll to get people's opinions on a question of either or. A simple thread asking for an opinion would work much better and a tally of the poll results would never get you the correct answer you are looking for. If you are using the NUBM44 for very close work, it should be focused well enough to cut through thin metal. If you want to use it at a farther distance, the answer will depend on how far away is your target.
I agree, the poll doesn't make any sense.

THe OP has to indentify much more clearly and precisely/specificlly, what he wants to do and parameters pertaining to what he wants to do materials, distances, end result desired and so on.

Last edited by Encap; 07-17-2017 at 10:57 PM.
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Old 07-17-2017, 10:13 PM #9
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Default Re: NUBM44 beam divergence

I guess ill stick with the g2 lens then. Thanks.

FYI i posted the poll for the lols
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Old 07-17-2017, 10:49 PM #10
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Default Re: NUBM44 beam divergence

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Old 07-17-2017, 10:54 PM #11
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Default Re: NUBM44 beam divergence

Quote:
Originally Posted by Encap View Post
Have a look at the excellent and relatively reasonable priced engraving and cutting head these guys in Poland make--excellent quality and products: Engraving laser heads - Opt Lasers
What kind of diode is in this:

Engraving Laser 12 W
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Old 07-17-2017, 11:01 PM #12
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Default Re: NUBM44 beam divergence

Quote:
Originally Posted by Andrew124C41 View Post
What kind of diode is in this:

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If you look at the description page for the item it tells you 2 X NUBM44 diodes running at 6W each, see: PLH - 12000 engraving laser head - Opt Lasers
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Old 07-19-2017, 01:57 AM #13
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Default Re: NUBM44 beam divergence

Quote:
Originally Posted by paul1598419 View Post
I don't get the reasoning behind using a poll to get people's opinions on a question of either or. A simple thread asking for an opinion would work much better and a tally of the poll results would never get you the correct answer you are looking for. If you are using the NUBM44 for very close work, it should be focused well enough to cut through thin metal. If you want to use it at a farther distance, the answer will depend on how far away is your target.
Quote:
Originally Posted by Encap View Post
I agree, the poll doesn't make any sense.

THe OP has to indentify much more clearly and precisely/specificlly, what he wants to do and parameters pertaining to what he wants to do materials, distances, end result desired and so on.
You guys do have a point, I guess I was just a little upset that I couldn't ever figure out how to do it.
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