505nm and 480nm diode RESULTS

[XenondiFluoride]

But 590 looks yellow, I mean low pressure sodium is about a yellow as you can get. I suppose 577 would be a brighter yellow though. I feel all the way out to 600 is still on the yellow side. are there any up an coming diodes in that area?

 

[NightExplorer96]

But 590 looks yellow, I mean low pressure sodium is about a yellow as you can get. I suppose 577 would be a brighter yellow though. I feel all the way out to 600 is still on the yellow side. are there any up an coming diodes in that area?

590nm looks yellow if it's by itself. Put it next to a 577nm DPSS laser and you'll see just how orange it really is. 590nm is actually the beginning of the Orange spectrum. Check out 590nm vs 577nm below:

577nm
590nm

Regarding diodes in the yellow/orange part of the spectrum, not really. Or if there are, they've been hidden very well. Lowest diode you could get would be a 622nm diode, but IIRC have to be ran super cold. 622nm would look like this:

622nm

:yh:
-Alex

 

[CurtisOliver]

580 +/- 2nm is generally accepted as pure yellow depending on the individual. Computers and wavelength calculators use 580nm as #ffff00 as well. Anything within 5nm of 580nm can be classed as 'true-yellow'. We have 589's and we sometimes refer to them as 'yellow', 'golden yellow' or 'sodium yellow'. Anything beyond this is bordering 'light-orange' and so on.

 

[paul1598419]

I agree with your first sentence, but then you go on to call 589nm yellow. Next to 577nm it is orange.

 

[CurtisOliver]

Well, yes. But that is also due to perspective. My 532 makes 589 shift towards orange, yet if I place a 650 next to it, it then looks yellow again. Also light conditions also affect how we perceive wavelengths at colour borders like that.
But 577nm is also arguably much more yellow than 589nm anyway.

 

[XenondiFluoride]

you are right, I suppose 589 is really orange, but until I see some 577 in real life, that LPS 589 is how I view a quality yellow. I am trying to find some 580nm LEDs.

So then those 594nm "yellow" neon lasers are really amber.

Sorry for derailing this thread.

As for these diodes, I noticed the ~480 one is sold out, do you all suppose the 505 one could be slightly overdriven and break 40mw? I am thinking of buying one, but it has to light matches. (silly rule of mine)

 

[ZRaffleticket]

Tech isn't there yet for the 580nm LD's. That and there isn't a commercial need for them right now.

The closest you'll find are 622nm diodes that only work at 5 *C (commercially).

There are articles that show that diodes can be made to lase down to 560 something nm; though those are purely scientific and are not in any sort of availability to us hobbyists.

___

The 480's are all gone sadly...

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The 505's can be pushed pretty hard. Somewhere in here DTR has a test where he fed these things >500mA.

I run mine at 275mA and get a solid 90-100ish mW from it after an acrylic lens. Recently changed to a 3-element so it's probably more.

Edit: it can light matches

you are right, I suppose 589 is really orange, but until I see some 577 in real life, that LPS 589 is how I view a quality yellow. I am trying to find some 580nm LEDs.

So then those 594nm "yellow" neon lasers are really amber.

Sorry for derailing this thread.

As for these diodes, I noticed the ~480 one is sold out, do you all suppose the 505 one could be slightly overdriven and break 40mw? I am thinking of buying one, but it has to light matches. (silly rule of mine)

 

[paul1598419]

I know for a fact the 505nm diodes can reach 100 mW. In fact several of them among members here are doing better than that.

 

[ultimatekaiser]

I'm amused at how many people still argue over what is yellow vs orange. The spectrum is continuous there's no particular place where it suddenly changes from orange to yellow. There will always be a little of each of the adjacent colors present.

That being said the exact place where something is exactly yellow is going to change person to person and the lighting conditions present when the judgment is made. The mind uses visual queues and references to determine color.

In my particular case- 561 and 568 are chartreuse, 577 is lemon yellow, but it does have a slight tinge of green. Same with 584. 586 is a nice solid yellow, 589 is a nice golden color, and is just starting to take on an orange hue. And 594 is a nice amber yellow. 600+ is most definitely orange....604.6 is a nice yellow orange, 607 and 612 are a nice traffic cone and firey orange respectively.

 

[paul1598419]

:yh: Good argument, Matt. Then you do in your last paragraph what you say everyone else is doing. It IS all a matter of perspective.

 

[XenondiFluoride]

if those 505s can drive that high (even 50mW is enough for me) then I think I'll get one. although that means I will have to go build a new current limiting source. (my old one was meant for working at 1+amps).

 

[paul1598419]

I have been limiting them to 250 mA or less. These diodes are case positive. If you don't understand the implications of that statement, you need to learn.

 

[paul1598419]

I've been too busy today to measure them yet, but the two 505nm diodes I got from Albert1007xd were not printed with the numbers he thought around the diode's window. They have two slightly different numbers. SB217HL91 and SB217HN91. So, apparently there are many iterations of these diodes now. I'll know more in a day or two about their wavelengths.

 

[Albert1007xd]

._.

Hope the pinout is the same and nothing ends up fried :/
Will ask to the seller anyway to see if they knew.

A.

 

[paul1598419]

Not to worry, Albert. They are case positive, so even if I get the other pin wrong....no harm no foul.

 

[Alaskan]

... 577 is lemon yellow, but it does have a slight tinge of green

Where did you find that 577 nm OPSL laser in your avatar? :drool:

By the way, that's cruel to show us you have that and unable to share with the rest of us, I bet in school you brought candy to the class but only enough for yourself! At the least post some beam shot photo's of the yellow glory it can produce!

:worthy: