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Old 05-26-2016, 02:07 AM #1
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Default 808 to 532

I have a handheld 5W 808nm IR laser. Since I can't use it without my NVG's I was thinking about adding a KTP crystal to make it green. Would this be worthwhile given the loss of mw through conversion or not?


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Old 05-26-2016, 04:56 PM #2
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Default Re: 808 to 532

Quote:
Originally Posted by 3LEGGEDSQUIRREL View Post
I have a handheld 5W 808nm IR laser. Since I can't use it without my NVG's I was thinking about adding a KTP crystal to make it green. Would this be worthwhile given the loss of mw through conversion or not?

You may want to read up some more on how 532nm DPSS lasers work.

You can't just slap a KTP crystal into your 808nm beam and get 532nm. Even if you could use the KTP crystal directly with the 808nm beam it'd yield 404nm, not 532nm.

You need to pump Nd:YVO4/Nd:YAG with 808nm which then produces 1064nm (with the correct optics too) and then the KTP produces 532nm from 1064nm. Again - you need the correct optics for that part too.

There are no "hybrid crystals" (Crystals that have the correct HR/OC mirrors on the faces and contain both YVO4/YAG and KTP) that can take a pump input of 5W. At least none that I'm aware of - the largest hybrid crystals I've seen go up to around 0.5-1W pump power.

That leaves you with using individual crystals with externally mounted HR/OC mirrors - although sometimes having the HR mirror coating on the YVO4 is possible. You won't have much success pumping that with a handheld.

You'd be looking at a setup like this:



Although both the HR and OC mirrors are external to the crystals in that setup.

May want to rethink your idea and just buy a 532nm laser...
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Old 05-26-2016, 05:46 PM #3
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Default Re: 808 to 532

As diachi said, it isn't that easy to do.

I was going to post something similar but didn't know you're background and if you've had experience building DPSS units so I stayed quiet. 532 DPSS is one of the more efficient processes around, but it isn't as easy as slapping crystals and voila! You need them aligned etc...

-Alex
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Old 05-26-2016, 06:03 PM #4
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Default Re: 808 to 532

Quote:
Originally Posted by Hap View Post
532 DPSS is one of the more efficient processes around, but it isn't as easy as slapping crystals and voila! You need them aligned etc...

-Alex
Well, you can do that with hybrid crystals - I've done it holding them between my fingers and hitting them with 1W 808nm from a handheld.

That said - it's not at all stable/reliable - for obvious reasons. You'll get a decent amount of green for a few seconds at most I've found. Can hardly be considered useful for anything. Plus without any other optics the output is highly divergent. We're talking >10mRad.

As I said above - there's no hybrid crystals that will handle 5W that I'm aware of. They're all too small so you'd end up damaging them, either they'd crack or you'd burn the coatings.

So yes, for all intents and purposes you're correct Hap.
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445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
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532nm | Gearbest 303 Pointer | 50mW Metered
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Old 05-26-2016, 06:56 PM #5
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Default Re: 808 to 532

Quote:
Originally Posted by diachi View Post
Well, you can do that with hybrid crystals - I've done it holding them between my fingers and hitting them with 1W 808nm from a handheld.

That said - it's not at all stable/reliable - for obvious reasons. You'll get a decent amount of green for a few seconds at most I've found. Can hardly be considered useful for anything. Plus without any other optics the output is highly divergent. We're talking >10mRad.

As I said above - there's no hybrid crystals that will handle 5W that I'm aware of. They're all too small so you'd end up damaging them, either they'd crack or you'd burn the coatings.

So yes, for all intents and purposes you're correct Hap.
Haha!

Imagine trying to build a 589 now

-Alex
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515nm: Generic "Laser Pointer-515P-10" Pen 12mW
473nm: CNI GLP-473 6mW
450nm: Z-Bolt BLP-5-S Pointer 6mW
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Old 05-26-2016, 09:45 PM #6
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Default Re: 808 to 532

Thanks for the info guys. Im new at this and the info provided was helpful. Im still learning.
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Old 05-26-2016, 10:04 PM #7
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Default Re: 808 to 532

Quote:
Originally Posted by Hap View Post
Haha!

Imagine trying to build a 589 now

-Alex

Nightmare fuel... At least it's a bit less picky than 593.

Quote:
Thanks for the info guys. Im new at this and the info provided was helpful. Im still learning.
Most welcome - if you're looking for more information on DIY DPSS this page has a good chunk of information: Sam's Laser FAQ - Home-Built Diode Pumped Solid State (DPSS) Laser
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<

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Old 05-27-2016, 04:49 PM #8
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Default Re: 808 to 532

Thanks for the link to Sams page on DPSS diachi. I do currently own:

2W WL 445nm Spyder III
1.4W WL 445nm Spyder III
750mW WL 532nm Spyder III
5W FMA 808nm

I have a few more (noname) specimens along with a DBAL A2 on my SCAR 17.

I have no experience in building them, but I am amazed at those who do and I am grateful for this forum and those who are willing to help. My expertise lies elsewhere.
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