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Searching for 495nm

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farbe2

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Hello Guys.


Some long long time ago, 495nm diodes appeared out of nowhere and disappeared as fast as they appeared.

Its a long shot but i have a little hope left.

Is there someone out there that still has a diode laying around and wants to get rid of it?
 
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I have two GH04850B2G's (SB308B292) in my collection. One hitting 489nm and the other 493nm.
The 493 is being driven at 220mA.

So it is possible still with that diode to see the higher end of cyan.
 
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Didn't Phillip say he could get them binned from the factory at that wavelength? Or bin yourself, pricing may be around the same.

If not, the 488s are cheap and robust enough that you can drive with CV instead of CC, and overvolt a bit to dramatically shift the WL greener at the cost of more heat to deal with, which you may be able to handle with your new TEC capable driver. Dunno how devastating that is to diode health but at $25/ diode how much does that matter?
 
I brought one from phillip. I got the highest one he had. Out of ?50?40? only one was above 491nm.
491,1nm. Thats the one I've got.

Its still not green and i am very hesitant to drive them up to around 495nm with just increasing the current.
If i blow the one I've got, i dont think i can get a equivalent one.

Temperature shifting seems almost doable. I think these diodes drift with just 0,07nm/k or something like that. That would need mean running a 491nm diode at 80°C to get to 495,2nm.
Mhm 80°C seems a lot.

Do they have a knee or do they just die?

If a knee is present, driving them down the slope after the peak could work (at least for a short while).
 
I have too a bunch of binned ones from the first batch ( look into my thread about binning them and also the selling thread).

I can get 497-502 directly from sharps factory (I posted their stock list in the removed channel some time ago).

Best
Singlemode
 
I just built a couple laser pens using the Sharp GH04850B2G diodes driven @150mA and they were about 10nm apart from each other. I was surprised when I went to test one and it was much more of a sky blue color than cyan.


1718994061493.png
484.5nm.jpg
494.3nm.jpg
 
I've tested a few more in the last hour and it seems I primarily have 494nm but a couple 484nm are in there as well.
 
Just got a 494.5nm pen in the mail from Barnett's eBay store, and the color is amazing! To my eye it is perfectly between green and blue. Depending on the surrounding lighting, it can look like a rich aqua turquoise, or a deep and minty seafoam green. Thanks Barnett!

PXL_20240626_164813169.RAW-01.COVER.jpg

Spectroscope showing it sitting perfectly between my blue and green lasers around 485nm and 505nm

PXL_20240626_165658163.RAW-01.COVER~3.jpg

PXL_20240626_165702811.RAW-01.COVER~2.jpg
 
Nice! But sharp announced for the first quarter, to massproduce a 498nm Diode (yes ist super rare having the wavelength binned. And 80mW output on top!
 
ChromeCaviar said:
Just got a 494.5nm pen in the mail from Barnett's eBay store, and the color is amazing! To my eye it is perfectly between green and blue. Depending on the surrounding lighting, it can look like a rich aqua turquoise, or a deep and minty seafoam green. Thanks Barnett!

View attachment 78164

Spectroscope showing it sitting perfectly between my blue and green lasers around 485nm and 505nm

View attachment 78165

View attachment 78166
Click to expand...
I really like the comparison!
 
Singlemode Laser said:
Nice! But sharp announced for the first quarter, to massproduce a 498nm Diode (yes ist super rare having the wavelength binned. And 80mW output on top!
Click to expand...
I’ve got 497 and 499nm from their 505’s diodes. So I reckon they are just now making these lower wavelength batches more available.
 
Shmackitup said:
I really like the comparison!
Click to expand...
This color is so cool to compare with other wavelengths! My favorite so far is 495 versus 555. The cyan color reminds me of a mystical pool of enchanted water, containing magic or memories. Meanwhile, the lime green looks like radioactive Pea-and-Plutonium soup that the Grinch puked up! Love em both
 
Ive got the 495 diode running 494nm@100mw, the ID is Sharp GH04955A2G.

Still my favourite Diodes to date where the SAMPLE - JLD480-50MW diodes that popped up years ago. I had 474nm@100mw, unbelievable colour coming from a single mode 5.6mm diode. If anyone has any, let me know ;)
 
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