Questions about Osram PB530 laser

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Re: Questions about Osram PB530 laser

by Eikie » Sat Feb 27, 2021 4:18 am

holomaker wrote: ↑Wed Jan 20, 2021 10:42 amAny updates?
Apart from moving house and a subsequent covid infection, no.

At the moment recovering, but no energy to tinker with lasers.

Thanks for asking.

Re: Questions about Osram PB530 laser

by holomaker » Wed Jan 20, 2021 10:42 am

Any updates?

Re: Questions about Osram PB530 laser

by Eikie » Thu Oct 01, 2020 1:47 am

holomaker wrote: ↑Wed Sep 30, 2020 9:50 pm
Eikie wrote: ↑Mon Sep 28, 2020 3:10 pm

Just to be sure:

I expand the laser beam, point at a glass plate and see if the reflection on a wall has those dark bands
At the moment, the expanded beam looks very noisy, is this a product of dirty/wrong lens?
It looks like your using a coated lens for a different wavelength, if you dare to remove the factory installed optics you will get a beautiful expanded beam that’s perfect for doing one beam work, DCG and Photopolymer Denisyuk’s. A word about the factory installed optics , when expanding beam be sure to locate your optics at least 8”+ in front of laser ad they have a projected pinhole and your optics will work cleaner...
Thanks, I will consider that. Was planning on using the two colors together, but I guess when removing the optics that is out of the question.

I'll also try another lens, this one was an unknown lens and will try the 8" to see if there is any difference.

Really appreciate the help...

Re: Questions about Osram PB530 laser

by holomaker » Wed Sep 30, 2020 9:50 pm

Eikie wrote: ↑Mon Sep 28, 2020 3:10 pm

Just to be sure:

I expand the laser beam, point at a glass plate and see if the reflection on a wall has those dark bands
At the moment, the expanded beam looks very noisy, is this a product of dirty/wrong lens?
It looks like your using a coated lens for a different wavelength, if you dare to remove the factory installed optics you will get a beautiful expanded beam that’s perfect for doing one beam work, DCG and Photopolymer Denisyuk’s. A word about the factory installed optics , when expanding beam be sure to locate your optics at least 8”+ in front of laser ad they have a projected pinhole and your optics will work cleaner...

Re: Questions about Osram PB530 laser

by Loic74 » Wed Sep 30, 2020 1:49 pm

Eikie wrote: ↑Tue Sep 29, 2020 2:06 am I have a spatial filter, but have issues aligning the two lasers correctly, let alone getting the filter aligned properly with one or both.
It will be the next step though. Steep learning curve ;)
Aligning three beams into a single spatial filter requires perfect co-linearity AND matched divergence of the beams. Good luck ;)

Re: Questions about Osram PB530 laser

by Eikie » Tue Sep 29, 2020 2:06 am

Loic74 wrote: ↑Tue Sep 29, 2020 1:19 am That could come from the lens you are using.
In any case a spatial filter is a good investment in holography :)
I have a spatial filter, but have issues aligning the two lasers correctly, let alone getting the filter aligned properly with one or both.
It will be the next step though. Steep learning curve ;)

Re: Questions about Osram PB530 laser

by Loic74 » Tue Sep 29, 2020 1:19 am

That could come from the lens you are using.
In any case a spatial filter is a good investment in holography :)

Re: Questions about Osram PB530 laser

by Eikie » Mon Sep 28, 2020 3:10 pm

holomaker wrote: ↑Sun Sep 27, 2020 6:17 pm I show you the setup so you can duplicate ... if dark steady bands are not seen we need to retune it ..
Just to be sure:

I expand the laser beam, point at a glass plate and see if the reflection on a wall has those dark bands?
If not, I turn the little screw on the blue block?
Clockwise or the other way and are we talking about a few degrees or multiple turns?

At the moment, the expanded beam looks very noisy, is this a product of dirty/wrong lens?
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Re: Questions about Osram PB530 laser

by holomaker » Sun Sep 27, 2020 6:17 pm

I show you the setup so you can duplicate ... if dark steady bands are not seen we need to retune it ..

Re: Questions about Osram PB530 laser

by Eikie » Sun Sep 27, 2020 11:41 am

John Klayer wrote: ↑Sun Sep 27, 2020 3:25 am Does it have to be in Instagram? Can't you just post it on this forum?
The video isn't to clear (to me). It seems to show an expanded laserbeam being reflected on a glass plate onto a wall. The reflection on the wall shows steady dark bands.

Apparently that is what I need to have, but am unsure how to get that (as in how to tune the unit).

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