Old 07-16-2016, 03:15 PM #65
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Default Re: 589nm misbehaving - wrong wavelength!!

Just so this is out there, this phenomenon has been observed a while back by both myself and bloompyle -- though for us it was cold. A shame all the pics are broken, they're long gone on my machine.

Granted, for us it would shift to a greener color, not orange... Good old SFG


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Old 07-16-2016, 09:35 PM #66
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Default Re: 589nm misbehaving - wrong wavelength!!

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Originally Posted by ZRaffleticket View Post
Just so this is out there, this phenomenon has been observed a while back by both myself and bloompyle -- though for us it was cold. A shame all the pics are broken, they're long gone on my machine.

Granted, for us it would shift to a greener color, not orange... Good old SFG
Thanks! This is also really interesting. Do you know where the laser is now (was it sold?)
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Old 07-16-2016, 10:56 PM #67
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Default Re: 589nm misbehaving - wrong wavelength!!

He sold a 594 pointer to me, which I then sold on to styropyro. he may be talking about that one, as it would switch to green (532) briefly on startup.

That pointer had some really odd characteristics in general. It loved to go green when cold, and if it was really cold, it would refuse to lase yellow at any observable strength for a minute or more. It would then peak at a power strong enough to see the beam in the dark (which for a 594 POINTER is actually quite impressive) and the barrel would get very hot. This laser always preferred running hot, and was a remarkably stable example once you got it nice and toasty, but ultimately that made it quite hard to enjoy in anything other than controlled conditions.

On the other hand, the Spartan 589 I have prefers it nice and cold, which will be a good thing when I get round to star pointing in the winter with it.

I love DPSS lasers because in many ways they are almost like living breathing beings.
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Old 07-17-2016, 06:18 PM #68
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Default Re: 589nm misbehaving - wrong wavelength!!

I cooled this laser down for longer than usual today, and found it emitting at FIVE wavelengths - 532 and four yellow/orange wavelengths, one of which was flickering. Then it went to all-589 and shifted to 593.5. This laser is weird!!
Also, I got some new 4.35v LG E1 18650 batteries today, it seems to like those much better than 4.2V 18650s.
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Old 07-17-2016, 06:56 PM #69
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Default Re: 589nm misbehaving - wrong wavelength!!

I know you say it's weird but it also sounds kind of a cool one of a kind too with lots of output.
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Old 07-17-2016, 06:58 PM #70
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Default Re: 589nm misbehaving - wrong wavelength!!

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I know you say it's weird but it also sounds kind of a cool one of a kind too with lots of output.
It's incredibly cool! I am so glad to have it, I suppose it was a stroke of luck that my original unit broke!
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Old 07-17-2016, 10:14 PM #71
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Default Re: 589nm misbehaving - wrong wavelength!!

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I just checked, and the weaker of my two Gearbest 532s appears to be emitting at 3 lines as well. Of course, I don't have a spectrometer to check.
Well, evidently 532nm DPSS lasers producing multiple wavelengths must be fairly common. I just checked and two of five lasers I checked emit ~4 wavelengths (of green of course).
I don't know if it could be raman shifting at all since from my quick observation the wavelengths don't look perfectly spaced, IDK.
The best I could make out the extra wavelengths would be very roughly 536nm, 539nm, 540nm. (assuming the brightest one was 532nm). Of course this is a quick and not precise measurement.


Pman, I bet you could check your massive collection of Fasttech 532nm modules to find samples to test.


EDIT: I have at least four extra lines and possibly a fifth for 532nm DPSS. (wavelengths were approximately: 532nm, 537nm, 542nm, 545nm, 550nm), although my measurements seem a little high.
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Old 07-18-2016, 04:40 AM #72
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Default Re: 589nm misbehaving - wrong wavelength!!

sweet! The first of my "532"s i put through my grating has 3 lines from a cold start 2 lines at 532+ the 3rd faint one was much more on the yellow side than my 543 HeNe. Once it warms up it is 532 only.
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Old 07-18-2016, 05:59 AM #73
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Default Re: 589nm misbehaving - wrong wavelength!!

I don't think I've ended up with green from mine, but I have gotten 5 yellows before. Keep in mind cooling below the dew point is bad for the laser, especially for the diode facet.
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Old 07-18-2016, 06:06 AM #74
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Default Re: GUIDE: Which company should I buy from?

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I don't think I've ended up with green from mine, but I have gotten 5 yellows before. Keep in mind cooling below the dew point is bad for the laser, especially for the diode facet.
Of course. I only cool it on an air conditioning vent, never in the fridge or freezer.
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Old 07-18-2016, 06:14 AM #75
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Default Re: 589nm misbehaving - wrong wavelength!!

yup. and just a note here...just cuz you see multiple dots, does not mean they're all laser lines. They can be caused by other phenomena too, but I don't feel that's the case with these. I haven't got enough info to prove either way yet. there are a slew of emissions that come from Nd 3+ that are not used or referenced hardly ever that can be at play here. 1064nm is just the most widely known.
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591nm: DPSS line
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594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line
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Last edited by ultimatekaiser; 07-18-2016 at 06:14 AM.
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Old 07-19-2016, 11:23 PM #76
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Default Re: 589nm misbehaving - wrong wavelength!!

^ Exactly that.

Though @trencheel303 note it was the 589, not the 593.5 that did the plethora of lines. The 593.5 I caught doing 532 and 671. Dunno if either of you reproduced that...

For the 589, I think that, if these lines are lasing, they might be as follows: 589nm, 588.3nm, 586.2nm, and 585.2nm. If you'd describe the 'fifth' line as an unripe banana yellow, throw in 550.9nm. If you'd describe it as more orange, it could be 590.2nm, 592.3nm, or 593.5nm. This is assuming that
  • The lines are lasing
  • The coatings are not filtering other lines out fully
  • Only two lines are being combined in a SFG process (there could be 3 or more, but as I understood it the complexity/feasibility goes way, way up)

Via my own data gathering spreadsheet found here under the ND:YAG tab. I won't say everything is 100% accurate, but as far as I know these would be candidates.

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Also, I got some orange light out of a 520nm diode. Wasn't coherent, but it most certainly was not in the green spectrum. This was tested and confirmed. Original thread here.
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Old 07-20-2016, 06:06 AM #77
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Default Re: 589nm misbehaving - wrong wavelength!!

Interesting theory ZRaffle. However, all of the lines are exactly, or almost exactly, evenly spaced. I will have a picture up tomorrow, the second and fourth lines appear to be 589 and 593.5.
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Old 07-20-2016, 06:22 AM #78
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Default Re: 589nm misbehaving - wrong wavelength!!

Sad thing is that the eyes are not good wavelength judges. especially when comparing so many close together. after looking at 584, 589 looks orange like 594. its really not so easy to compare. ultimately unless you put it on a spectrometer, it's all just speculation. Either that or you can put it on a VERY expensive very dense diffraction grating with huge amounts of lines/mm like 1200 plus and do the math to figure out the wavelengths that way, but that wouldn't be as reliable. I really need to dig up my spectrograph of my yellows. some of mine do odd stuff like this too. I even put one on a seperate pump and got odd behavior too. I'd love make a lab laser out of one of these, but it'd cost me a fortune to do. money I don't have sadly.
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405nm: Melles Griot RCS
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441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473-5
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics Cyan 488-20 DECSL, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-100
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
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Last edited by ultimatekaiser; 07-20-2016 at 06:22 AM.
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Old 07-20-2016, 06:48 AM #79
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Default Re: 589nm misbehaving - wrong wavelength!!

I suppose my wording was poor; I was trying to say that the second and fourth lines are the two that it settles on.
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Old 07-20-2016, 07:55 PM #80
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Default Re: 589nm misbehaving - wrong wavelength!!

Hello folks, here's the image of the five dots; the first and last ones flicker on and off a lot.
Second and fourth lines are the ones it settles on.
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