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Old 08-23-2017, 09:58 PM #65
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Default Re: Trying to build an insane 532 nm laser

Quote:
Originally Posted by hakzaw1 View Post
With growing excitement I read just now the OP and the first page of this NOW de-railed thread.. then.. pages 2 and 3 --wasted space.
STOP!!

no more posting!! even agreeing, saying sorry or thanking posts -- you can do that by +repping .



@ the mods..
its known you have been trying but..
more needs to be done about this-- it is NOT getting better...
we can do it if you like...

I sure would like to see this thread continue (and the deletion pages 2 & 3)

or we can do THAT as well.. if ALL (others)deleted their posts on those pages--
that would be effective.


reason for deletion: I refused to be a part of re-railing a great thread.
You're a little late to the party Hak...
It was already solved on Aug 21/17...

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Old 08-24-2017, 01:05 AM #66
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Default Re: Trying to build an insane 532 nm laser

oops.
did I do that??
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Old 09-13-2017, 03:15 PM #67
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Default Re: Trying to build an insane 532 nm laser

BTW, I've found a shard from a big He-Ne tube with a big Brewster window. Will it work as a polarizer if I put it into the resonator of the YAG laser? How can I make sure then that the laser beam is polarized?
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Old 09-13-2017, 03:31 PM #68
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Default Re: Trying to build an insane 532 nm laser

Quote:
Originally Posted by Laserbuilder View Post
BTW, I've found a shard from a big He-Ne tube with a big Brewster window. Will it work as a polarizer if I put it into the resonator of the YAG laser? How can I make sure then that the laser beam is polarized?

Brewster angle is wavelength dependent, it may be close enough to work though, I'd build in some adjustment if you can.

To determine polarization just use a PBS or some other polarization dependent optic to see if the beam is blocked/reflected at specific orientations.
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Old 09-13-2017, 08:32 PM #69
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Default Re: Trying to build an insane 532 nm laser

The Brewster's angle is wavelength dependent and there is quite a lot of distance between 632.8nm and 1064nm or 532nm. Aren't those angles set in the HeNe shard? I don't see a way forward with it, but I have been wrong before.
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Old 09-13-2017, 08:54 PM #70
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Default Re: Trying to build an insane 532 nm laser

Quote:
Originally Posted by paul1598419 View Post
The Brewster's angle is wavelength dependent and there is quite a lot of distance between 632.8nm and 1064nm or 532nm. Aren't those angles set in the HeNe shard? I don't see a way forward with it, but I have been wrong before.

There's a little deviation allowed, best bet would be to mount the plate/stem so that it's adjustable over a couple degrees.

That or buy a Brewster plate specifically cut/mounted for 1064nm.
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Old 09-14-2017, 06:12 PM #71
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Default Re: Trying to build an insane 532 nm laser

Even though this is a old thread now. Laserbuilder, the very best of luck with this. Look forward to seeing your results. Some good help mentioned already.

From what I've found, things to take into account:
  • polarisation (very important)
  • phase matching (also important unless NCPM)
  • power density (depends on damage threshold of crystal)
  • temperature (some crystals are more efficient at certain temps)
  • hygroscopicity (LBO etc)
  • coatings (ar and hr)

It is such a shame KTP can't be used on high power systems. Well, not without sacrificing on a larger beam diameter anyway.
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Old 09-15-2017, 07:20 AM #72
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Default Re: Trying to build an insane 532 nm laser

Thanks for your replies.
AFAIK, Brewster windows of He-Ne tubes are made of fused quartz. And yes, the Brewster angle is wavelength-sensitive because the refractiotion coefficient is different on different wavelengthes. But as for quartz -- it has n=1.53 at lambda=1.2 um and n=1.54 at lambda 0.67 um. So, the difference is miserable. I hope it will work.
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Old 09-16-2017, 04:38 AM #73
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Default Re: Trying to build an insane 532 nm laser

yes, the difference is there, but super negligable. all you need is an optical flat that passes said wavelength, and just turn it until it's at the appropriate angle. fused quartz is usually the standard material for most visible and NIR sources. often times they just cut one end of the rod at the appropriate angle and build a ring out of it if they want to control the frequency and polarization, as it requires fewer optics and runs less risk of damaging them from thermal load and other issues.
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Old 09-16-2017, 04:47 AM #74
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Default Re: Trying to build an insane 532 nm laser

Quartz is birefringent, if I'm not mistaken.
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Old 09-16-2017, 07:11 AM #75
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Default Re: Trying to build an insane 532 nm laser

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Originally Posted by paul1598419 View Post
Quartz is birefringent, if I'm not mistaken.
It is.

It's well suited for Brewster plates though, very wide wavelength range. 185nm to 2100nm. Plenty of other good properties too.
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Old 09-18-2017, 01:49 PM #76
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Default Re: Trying to build an insane 532 nm laser

Laserbuilder, what is your experimental setup right now? (this thread as I see was started half year ago)

As I remember a Brewster plate is not coated - it's just a not too thin not too thick glass or fused silica plate orientated at a Brewster angle. Though don't know for lasers with double wavelengths like 532 and 1064. It was a long long time ago when I repaired a 1064/532 laser - it had a plate but don't recall if it was coated and what kind of alignment was needed.
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Old 09-19-2017, 06:28 PM #77
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Default Re: Trying to build an insane 532 nm laser

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Laserbuilder, what is your experimental setup right now?
At the moment it is disassembled and put into storage. I'm trying to get running a big argon laser but have trouble with the power supply. After that I hope I will return to this project, possibly I'll re-assemble it customly on a thick aluminium plate instead of modifying those LTI-501 lasers.
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Old 09-19-2017, 07:00 PM #78
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Default Re: Trying to build an insane 532 nm laser

Best of luck. That's the problem with laser projects. Often you end up with more than one on the go.
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