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Old 07-10-2014, 10:25 PM #1
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Default 593.5 DPSS process

Hello all,

I have looked through LPF & online for a specific answer to what I am looking for but have had no success. I know 593.5 DPSS is made by combining both 1064 & 1342 IR lines but I am confused on how the process is set-up. I made a drawing on paint to help explain my point, and am wondering if the correct process is either #1, #2 or if I have it completely wrong?

If you need a more detailed drawing feel free to let me know!



-Alex


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Last edited by Hap; 07-10-2014 at 10:26 PM. Reason: Added word.
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Old 07-10-2014, 10:31 PM #2
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Default Re: 593.5 DPSS process

Neither.

While the process can make 532nm and 671nm as a side effect, the "doubler" (ktp in this case) will effectively sum the wavelengths and double that.

1/((1/1064)+(1/1342))=~593.5

I'm on and off working on a DPSS spreadsheet online... gonna hopefully explain processes better there. Someday.

https://docs.google.com/spreadsheet/...=sharing#gid=5
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Old 07-10-2014, 10:34 PM #3
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Default Re: 593.5 DPSS process

^Alrighty, thank you very much ZRaffle

-Alex
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Old 07-10-2014, 10:47 PM #4
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Default Re: 593.5 DPSS process

Aye, np.

For those who may eventually want a visual,

Attached Thumbnails
593.5 DPSS process-dpss.png  
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Old 07-11-2014, 05:04 AM #5
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Default Re: 593.5 DPSS process

yep. that's exactly right raffle.
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Old 07-19-2014, 11:04 PM #6
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Default Re: 593.5 DPSS process

I think I've only ever seen 671 out of mine once, but at low powers it's quite hard to discern from the IR emission. Newer ones apparently have less noticeable 532 (I can't vouch for that) but on mine it's always visible if the beam is split, and becomes apparent without any viewing aid if too cold, hot or on low battery.

As a side note, I believe a YVO4 coating is also used on some mercury lamps as the phosphor that converts shortwave UV into more useful visible light at the red end of the spectrum; so it doesn't just fluoresce at 808.
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Old 07-19-2014, 11:14 PM #7
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Default Re: 593.5 DPSS process

Yeah there's a whole range that fluoresces Nd3+ ions. 808 (and 869) is just among the most efficient absorbtion wavelength...not sure about UV. And you shouldn't get any other lines out of it unless it's battery's is dead. Only the yellow should be present. If you're getting other colors then something is wrong. Usually misalignment causes that. A lot of those lower power IR lines have a tendency to compete with each other. Which is part of why these lasers operate so wonky.

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Old 07-20-2014, 12:12 AM #8
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Default Re: 593.5 DPSS process

It might be a slight alignment issue but it was the same when it was in raffle's possession and otherwise is a stellar performer. The green is just visible as a small secondary when splitting the main beam.
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Old 07-20-2014, 12:17 AM #9
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Default Re: 593.5 DPSS process

Yeah it just means not all of the 1064 is being doubled. The KTP is probably slightly off/misaligned nothing bad, just a quirk.
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Old 07-20-2014, 12:49 AM #10
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Default Re: 593.5 DPSS process

that's interesting, as I guess it means it's still got a bit of potential extra power to be had if it was aligned perfectly. From a visual judgement I'd say the green is absolutely no more than 0.5mW, and the yellow is already really bright. I think when eytyxhs owned this rigel he metered it at 13mW... mind you that was back when it actually had paint on it!
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Old 07-20-2014, 12:56 AM #11
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Default Re: 593.5 DPSS process

Pretty good for a pointer. It also might just have a vanadate that is particularly happy in that specific setup. Every crystal is unique, so it's not unthinkable that it's just particularly efficient for that cavity's specific environment also.
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Old 07-20-2014, 01:08 AM #12
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Default Re: 593.5 DPSS process

It's definitely a freak of nature as once warm it's more stable than any of my greens.
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