FINISHED - January 2024 JLasers Giveaway!

[CurtisOliver]

Yeah, I never saw one that low in wavelength. Haven't seen any new ones though recently.

I didn’t think they did go that low. That’s why I seriously doubted the measurements. When I saw 497 I first thought that had to be wrong. Then I considered it being a high 495. But the 499 quickly dismissed that as it was too high.

 

[paul1598419]

I didn’t think they did go that low. That’s why I seriously doubted the measurements. When I saw 497 I first thought that had to be wrong. Then I considered it being a high 495. But the 499 quickly dismissed that as it was too high.

I wouldn't discount the possibility that these are just 495nm diodes. After all, 497nm is 8 nm lower than 505nm and it seems unlikely that Sharp hasn't figured out how to make a 505nm diode that is closer than that.

 

[CurtisOliver]

I wouldn't discount the possibility that these are just 495nm diodes. After all, 497nm is 8 nm lower than 505nm and it seems unlikely that Sharp hasn't figured out how to make a 505nm diode that is closer than that.

Potential flawed batch? Also, I get it that its possible but unlikely for 497nm but 499nm seems very high for the 495nm diodes. I have one already that sits between 492-494nm in reality. These would have to overdriven surely to almost breach 500nm.

 

[Gryphon]

The last five Sharp 505 diodes I bought were 503, 504, 504, 509 and 509, hence the 503 and 509 in my signature. I would love to have a 497 or 499, would be great space fill in my spectrum.

 

[CurtisOliver]

The last five Sharp 505 diodes I bought were 503, 504, 504, 509 and 509, hence the 503 and 509 in my signature. I would love to have a 497 or 499, would be great space fill in my spectrum.

I can assure you, you wouldn't be disappointed with the colour.

 

[paul1598419]

IDK. Seems more likely that 495nm diodes could reach 500nm than a 505nm diode being 8nm shorter in wavelength. Especially after all this time. All my Sharp diodes are over driven. As long as they are heat sunk well they tend to hold to their wavelength rather than the current causing them to reach longer wavelengths.

 

[RedCowboy]

I don't have a spectrometer but of the four 488's I have mounted at the moment, there is one that really stands out, it's sky blue without the greenish tint that the other 3 have, wish I could get another just like it.

 

[CurtisOliver]

I don't have a spectrometer but of the four 488's I have mounted at the moment, there is one that really stands out, it's sky blue without the greenish tint that the other 3 have, wish I could get another just like it.

Sounds like 485-486nm possibly.

 

[Gryphon]

Out of curiosity what model is that diode? I've tried the GH05030C2LM (503nm), GH05035A2G (504nm) and GH05030D2L (503-509nm) but now that I'm looking they also have GH05050A2G, and GH05030H2L. And that's just what I see listed on eBay as "505nm" offerings from Sharp.

 

[CurtisOliver]

Out of curiosity what model is that diode? I've tried the GH05030C2LM (503nm), GH05035A2G (504nm) and GH05030D2L (503-509nm) but now that I'm looking they also have GH05050A2G, and GH05030H2L. And that's just what I see listed on eBay as "505nm" offerings from Sharp.

I'm not sure without trying to photograph the can.

 

[paul1598419]

Sounds like 485-486nm possibly.

The lowest one I saw was a bit above 486nm. That was out of dozens of diodes I measured.

 

[Gryphon]

My lowest one is a 483nm, it did 482nm at threshold but is sitting quite happily at 483nm @ 100mW. It's a noticeably deeper blue compared to 488nm and wild to think they are the same diode

 

[Deleted member 17304]

I'm not sure without trying to photograph the can.

Unfocus the lens and aim the spot in a beam dump. If a number is printed on the can, it will be reflected.


Edit: Don't include me in the giveaway please - just curious on the 505 curtis has

 

[paul1598419]

My lowest one is a 483nm, it did 482nm at threshold but is sitting quite happily at 483nm @ 100mW. It's a noticeably deeper blue compared to 488nm and wild to think they are the same diode

When did you get it? All the ones I measured were out of the first batch of diodes. Never saw one anywhere close to 483nm.

 

[RedCowboy]

This data sheet shows 480-495nm and I expect that's the range they have seen, I expect different batches have different center wavelengths.

10 pcs. for 170 bucks is pretty good, 17 dollars a diode if you buy 10.

Pardon Our Interruption...

 

[paul1598419]

Wow! Fifteen nm is a lot for a single Sharp diode part number. Wonder if one can get a specific range when one orders them.