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FrozenGate by Avery

Green Diode not only emitting green

ZRaffleticket

ZRaffleticket

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Feb 4, 2010
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I was playing around with my 532, also checking for IR when I sidetracked with my 520nm...
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This is the 520nm shined through an orange lava lamp. NOTE THIS IS NOT SPECIFIC TO THE LAMP! I can recreate this with my goggles.

I couldn't pick out any orange light with my 488nm, 473nm, or 532nm... Now this gave me two thoughts:

  1. The dye is fluorescing at a range only the ~520nm laser can supply
  2. The laser is emitting quite a bit of orange

Did anybody get one of these diodes wavelengths metered? And can anyone with one of these diodes recreate this? (not enough are floating around to ask "is this normal" yet)

I know some 405's show some yellow but I haven't seen the 445's do anything like this, MM or SM, so I assumed it was just for the 405's...
 

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I would think if the dye within the lamp were fluorescing, you would see an orange beam within the medium. Just curious, what output power is this 520nm?
 
It's putting out about 50mW's, gonna hopefully have an accurate reading next week (LPM in the mail). These are usually in the 40-60mW range...
 
EDIT: Check carefully in the photo. I think I see an orange beam. Just below the bright green one. It points straight to the orange dot on your hand.

Can't be dye lasing. Its oil, wax and a 50mw CW diode beam. I just can't believe it would be a dye lasing action. I sure hope I'm wrong.

Someone get a spectrometer on this NOW!

Can't carry out a coherence test with something coming out of a lava lamp... any way to check for monochromacity?

Try to get a VERY good profile of the beam of light exiting the lamp. It should help us know if it is part of the diode's output or part of the lamp's possible fluorescence.

Get that beam under a kid's prism, an old cd, anything you can use to "separate" any components of the beam into the component wavelengths.

try "pumping" the lamp with 532, 445, 405 and check for any orange fluorescence.

Also, play with different beam waists going through the lamp. Do only small sizes produce this color? Or do all?
 
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I've got a spectrometer, send me the lava lamp and the 520nm laser? :D

Can you take a power reading of the laser from the orange side?
 
Meatball said:
EDIT: Check carefully in the photo. I think I see an orange beam. Just below the bright green one. It points straight to the orange dot on your hand.

Can't carry out a coherence test with something coming out of a lava lamp... any way to check for monochromacity?

Try to get a VERY good profile of the beam of light exiting the lamp. It should help us know if it is part of the diode's output or part of the lamp's possible fluorescence.

Get that beam under a kid's prism, an old cd, anything you can use to "separate" any components of the beam into the component wavelengths.
Click to expand...

There's an orange beam where the laser shines through, explained more in a bit.

The 520nm vastly overpowers any orange I see with a glass prism and a brand spanking new CD, however, I can still produce an orange spec of light through some goggles :D

Meatball said:
try "pumping" the lamp with 532, 445, 405 and check for any orange fluorescence.

Also, play with different beam waists going through the lamp. Do only small sizes produce this color? Or do all?
Click to expand...

In the OP I mentioned the wavelengths I tried with the globe, none showed me anything (except the 473 showing some IR), and the 445 managed to get quite a bit of light through it.

All of them made an orange "beam" in the lamp however none made an actual orange beam exit the globe.

Beam size doesn't mean much to this, just if the beam enters too big it's too dim for me to see.

Le Quack said:
This is kinda neat. It's a really pretty orange color too.
Click to expand...

Not sure if you've seen 589nm or not, it's not too far from that, however it's noticeably more close to red.

I'd be willing to send it to get metered, I'm curious of what the peak WL this is putting out anyway. Gonna PM mariomaster and ARG in a bit.
 
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ZRaffleticket said:
The 520nm vastly overpowers any orange I see with a glass prism and a brand spanking new CD, however, I can still produce an orange spec of light through some goggles :D

Beam size doesn't mean much to this, just if the beam enters too big it's too dim for me to see.
Click to expand...

Ok. Well power density of a dye pump is very important, so just completely eliminate that option. If you can see something without the lamp however, that is very interesting!
 
This was actually quite a well known phenomenon with some 473nm DPSS lasers. I dunno how, but I've seen them produce very trace amounts of yellow too.
 
The would produce the yellow due to incorrect DPSS, I'm pretty sure... but this is a diode laser. No crystals involved o.o
 
Out of the four 473's I went through, not one produced any yellow. Actually never knew they did that... kind of want to find one now! Accidental SFG... something makes me think that shouldn't happen :p
 
Try using a diffraction grating and a smoke machine. The diffraction grating should separate colors if there are any, and the smoke machine would show the beams well, in case output is low. Also, the further from the diffraction grating you get, the more spread it will be and the easier to tell if there is any other colors present.
 
I don't think the diffraction grating will prove too much more useful than the CD or prism, however I'll dig around for mine in the morning. Though, just for reference, there's easily less than 1mW of orange coming out of this. Enough to be seen in a dark space, but its easy to drown out.
 
The reason I think it may help is because when you separate them in a prism, the light will sort of make the prism glow pretty intensely, but I feel there would be less of that with the grating.
 
Okay. I've suddenly got to test my 520s with a diff grating. This is nuts if it's actually doing multiline right out of a diode... With DPSS i can see that. But a diode? Both lines actually *lasing*? I'm not so sure the lava lamp is doing anything but acting as a filter...

(Now, i've been gone for a bit; if there's gonna be another GB on these PL520s..... i'm there...)
 
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