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Old 07-12-2013, 04:11 AM #1
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Default "ML" 589nm

I got my 589nm PGL-III-C from the GB a couple days ago, and I was playing with a grating, and noticed something. Happened when the gal was over so I had her sanity check me... Yes. 3 dots. The extra 2 are both <589. One mostly yellow, and another greenish.

I told Raffle immediately as he's my go-to for dpss. He was baffled and did it too. Same thing. As he scratched his head, he said perhaps 585 and 546nm.

Seems a much yellower green to me, like 556 or higher. Though I'm no expert. I can post pictures in the morning, but my camera does a horrible job differentiating the "yellows".

Here's the kicker, they only stay for about 15sec before warmup, then all 589 after that.

Thoughts? Pics up after work tomorrow.

These gratings man...


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Old 07-12-2013, 04:22 AM #2
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Default Re: "ML" 589nm

SFG uses an 808 pump for a crystal that lases at 1064nm and several other nearby lines deeper in the IR spectrum. The crystal that follows that does the actual SFG to combine the 1064nm and the other main IR line doesn't care what wavelength the other line(s) are. And that there is how this happens; the first crystal lases at 1064nm, your normal target wavelength (1342nm for 593.5nm), and sometimes during startup other additional lines. When the second crystal combines the 1064nm with the other additional lines you get additional wavelengths outputting. When the first crystal lases at only 1064nm you get only 532nm out, which was the common "warm up green" seen by early yellow pointers.
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Old 07-12-2013, 04:42 AM #3
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Default Re: "ML" 589nm

Well, your 589 is doing SFG on 1064nm and 1319nm. 1064nm is fairly dominant, so I'd expect it would be a product of that and something else, but that's not necessarily guaranteed.

There's possibilities at 546nm, 551nm, and 571nm. 556nm and 561nm are also on the table.

But really... it's impossible to say unless you test it with a spectrometer or do really precise measurements with a diffration grating using the 589nm and a 532nm laser as references.

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Old 07-12-2013, 04:58 AM #4
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Default Re: "ML" 589nm

If it's also very similar to 589nm in color it might very possibly be 585nm due to a bad coating (or lack of transmission control within 12nm of 1064nm-- 1052nm may also be present)

Being 589nm is in a very "easily manipulated" eye color response area, a 4nm difference is likely a noticeable one.

As for green... probably 532nm

I did forget about 571.5nm being a possibility. Though I find that a bit less likely...

Edit: for anyone interested, I'm trying to reproduce the results with a prism. *puts 589 in freezer*

I only got the green to show so far

Edit 2: Man how'd you find this at all. At least for mine you'll only see the other line(s) for more than a few seconds coating this in a dry ice... I can't even get the green again
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Old 07-12-2013, 05:14 AM #5
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Default Re: "ML" 589nm

Quote:
Originally Posted by ZRaffleticket View Post
If it's also very similar to 589nm in color it might very possibly be 585nm due to a bad coating (or lack of transmission control within 12nm of 1064nm-- 1052nm may also be present)

Being 589nm is in a very "easily manipulated" eye color response area, a 4nm difference is likely a noticeable one.

As for green... probably 532nm

I did forget about 571.5nm being a possibility. Though I find that a bit less likely...

Edit: for anyone interested, I'm trying to reproduce the results with a prism. *puts 589 in freezer*

I only got the green to show so far
I can find reference to 1052nm emission in Cr:YAG lasers, but nothing from neodymium... am I missing something?

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Old 07-12-2013, 05:17 AM #6
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Default Re: "ML" 589nm

Sam's Laser FAQ - Solid State Lasers

Quote:
Nd:YAG has over a dozen other weaker lasing transitions between 1,052 nm and 1,444 nm
http://en.wikipedia.org/wiki/Tunable_laser

Quote:
Nd:YAG has weaker transitions at wavelengths of 1052 nm, 1074 nm, 1112 nm, 1319 nm, and a number of other lines.[6]
Didn't see that it was a weak line though. Might actually be 571.5nm then. Though letting 946nm into the mix... that's odd.
That still doesn't sound right though...

Edit: nevermind, wiki's wavelengths at least tell me common lines LPF knows about. 1052nm could SFG with 1319nm.
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Old 07-12-2013, 05:17 AM #7
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Default Re: "ML" 589nm

Very interesting. I'll have to check this out on mine when I get the time tomorrow.
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Old 07-12-2013, 05:22 AM #8
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Default Re: "ML" 589nm

Quote:
Originally Posted by ZRaffleticket View Post
Sam's Laser FAQ - Solid State Lasers

Didn't see that it was a weak line though. Might actually be 571.5nm then. Though letting 946nm into the mix... that's odd.
EDIT: Oop, you edited while I was posting the stuff below. Well, it lists 1319nm as a weak line too, and that's used in this laser to get 589nm. With that in mind, 1052nm seems pretty likely.

From the sound of that page on Sam's Laser FAQ, it seems like 1053nm only has relevant levels of gain in Nd:YLF, not Nd:YVO4?

And I agree... 946nm in the mix would be weird. But then again so is the behavior of the laser to begin with.

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Old 07-12-2013, 05:25 AM #9
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Default Re: "ML" 589nm

589nm uses Nd:YAG
593.5nm uses Nd:YVO4

Edit: Well... more commonly with 593.5nm at least

1052nm looks like it gains in Nd:YAG


OH CRAP I FORGOT MY 589 IN THE FREEZER

I'm not even seeing light
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Old 07-12-2013, 05:31 AM #10
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Default Re: "ML" 589nm

Evidently I've fallen behind the times while I've been writing code; for some reason I thought Nd:YAG still wasn't used in CW applications.

Hm... if 1052nm gain requires 1064nm being suppressed, that would explain why these lines only appear as the last initially warms up. As thermal conditions become more favorable for 1064nm and 1319nm to gain and result in 589nm, the 1052nm transition stops lasing.

...then there's still the question of the green. SHG of 1064nm sounds fairly likely... but that implies that 1064nm is dominant enough to yield 532nm, which would probably muscle out 1052nm emission?

This laser needs to be put on a spectrometer.

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Old 07-12-2013, 05:35 AM #11
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Default Re: "ML" 589nm

Any way we put this, that's what it boils down to.

I am getting some light now, I don't have any low powered 532's anymore but from what I remember, this is it.

It still might be a freak and somehow let 537nm if bloom says its not 532nm, in that case it's SHG'ing 1074nm (also likely within coating "color" tolerance)

Edit: if I stay up any later I'm gonna kill my 589nm. I'll do more investigating tomorrow when I can...
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Old 07-12-2013, 06:22 AM #12
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Default Re: "ML" 589nm

There's a few cheapish 1,000$ spectros on ebay right now for you folks interested
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Old 07-12-2013, 01:09 PM #13
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Default Re: "ML" 589nm

I am eventually getting a spectro.

It's way too yellow to be 532. I am sure of that, it's right next to the other yellow line. If the 585 is right next to the 589, then 532 wouldn't be nearly as close. It's about 10-15nm away from the 585.

I was just wanting to see pure yellow dots everywhere, and it looked cool to see all the beams. I told her she'd like it, showed her, and noticed it then. She wasn't nearly as excited
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457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
609nm Ne Penning mixture Ar line from REO 612nm
612nm HeNe 1mW ML 4 line; Raman 6 line
629nm <1mW Raman 6 line
633nm 1-4mw red HeNe
635nm Raman 6 line
638nm 20mW single mode
640nm Raman 6 line
647nm ~10mW ArKr whitelight Kr line
650nm Raman 6 line
658nm LPC-826
685nm 20mW
808nm Modded NewWish pen


HeNe/gas reference thread
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Old 07-12-2013, 02:21 PM #14
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Default Re: "ML" 589nm

Well mine's spitting 532nm out for sure

I can't get any other WL's though. If you think its within 15nm you're likely seeing 589nm, 585nm and 571.5nm.

This letting 946nm lase if that's the case... that still blows my mind
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502nm 85mW badboybilly host
510nm 90mW PLANNED
520nm 30mW laserlands pointer
532nm 25mW Cheap Pen
589nm 100mW Spartan multiline
635nm 200mW C6
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DPSS Theoretical Wavelength Chart

Last edited by ZRaffleticket; 07-12-2013 at 02:22 PM.
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Old 07-12-2013, 05:17 PM #15
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Default Re: "ML" 589nm

Wish I had a better camera to pick it up.

It's pretty awesome though. 3 line 589, I love getting unique lasers like this.
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405nm 500mW
442nm 15mW Melles Griot HeCd
445nm 1W
455nm 100mW LaserBTB
457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
609nm Ne Penning mixture Ar line from REO 612nm
612nm HeNe 1mW ML 4 line; Raman 6 line
629nm <1mW Raman 6 line
633nm 1-4mw red HeNe
635nm Raman 6 line
638nm 20mW single mode
640nm Raman 6 line
647nm ~10mW ArKr whitelight Kr line
650nm Raman 6 line
658nm LPC-826
685nm 20mW
808nm Modded NewWish pen


HeNe/gas reference thread
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Old 07-12-2013, 05:18 PM #16
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Default Re: "ML" 589nm

You and your Multilines

I'm gonna post the picture you sent me in a sec--

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405nm 1W Sanwu Challenger COMING SOON
450nm 300mW
462nm 2W MS-SSW
472nm 2W maglite
480nm 125mW mrcrouse
485nm ??????
488nm 20mW Uniphase Argon
502nm 85mW badboybilly host
510nm 90mW PLANNED
520nm 30mW laserlands pointer
532nm 25mW Cheap Pen
589nm 100mW Spartan multiline
635nm 200mW C6
650nm 350mW PLANNED

DPSS Theoretical Wavelength Chart

Last edited by ZRaffleticket; 07-12-2013 at 05:22 PM.
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