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FrozenGate by Avery

505nm and 480nm diode RESULTS

  • Thread starter Thread starter Deleted member 16589
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Everyone sees light colors differently. I have no idea what it will look like to me, but I'm anxious to find out.
 
It tends to change at about 500nm for most people. One side is a bit more green, the other side is a bit more blue. I personally like the 500nm range stuff. it's a very pretty blue-green color to me.
 
It depends by community. What is cyan (█) on a computer is called blue by many people around the world. East asian countries even call █ blue, except when it is █ and grows.

Being grown up with computers with BASIC and EGA colors, I definitely won't call █ blue, and am borderline hesitant of calling █ (sky-blue) as blue, because it is half-way between blue and cyan.

Other people, especially those not grown up with our R-G-B color mixing knowledge, call █ indigo and █ blue.

My point is, depending on how many of the following swatches a person calls blue (█ █ █), they will obviously put the border at a different wavelength.

Reference: The Invention Of Blue (Youtube)
 
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Anyone here know joeybab3? I sent him his ten diodes back at my expense, but have had no luck getting in touch with him. He sent me a PM about two weeks ago about them and I only had to box them up and mail them, but I haven't seen nor heard from him since. :thanks:
 
paul1598419 said:
Anyone here know joeybab3? I sent him his ten diodes back at my expense, but have had no luck getting in touch with him. He sent me a PM about two weeks ago about them and I only had to box them up and mail them, but I haven't seen nor heard from him since. :thanks:
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Paul, I just looked him up buddy.
I need to send you a PM in a few minutes.

RB
 
OK, I pressed two SB217HL91s courtesy of Dr.Laser, with thermal paste in between the diode and the copper module for best heat transfer. They were then mounted in a small C6 heatsink for some heat protection and this is what I got: Basically the wavelength of these is a bit longer, around 505.7 or so at lower current, and is about 406.8 center wl at operating current. They are however, a bit more efficient than the ones that are lower wavelength, running at a substantially lower current-about 20mA lower. My other diode, a SB1573N91, is doing 31mW cold @ 503.1nm (35mW rated) at 130mA (Iop) So despite the longer wavelength, based on the comparison of the two, the balance of semiconductor materials must be a battle between power/efficiency while still keeping the wavelength at the same emitter size. The efficiency is better, more where it should be- but the wavelength green-shifted about 4nm.

Diode model: SB217HL91

Diode 1:
Threshold: 34.5mA - 505.7nm
5mW - 45mA @ 506.5nm
30mW – 108mA 506.8(avg) 507.3nm (peak)
43mW @ 150mA
55mw - 195mA @ 508.2nm

Diode 2:
Threshold: 49.5mA @ 505.7nm
5mW – 49.0mA @ 506.8nm
30mW - 108mA @ 506.8(avg) 507.3nm (peak)
44mW @ 150mA
(diode protection cuts in at about 175mA and shuts off the diode, likely to prevent damage, so I don’t think the diode liked going higher than this. Diode still works though just the same)
 
Wow. The one SB217HL91 I measured must be a fluke. It was under 502nm at threshold and only increased a little at 175 mA, but I didn't allow it to heat up, so maybe that is the difference in the WL shift. The SB1573N91s that I measured were mostly in the 503nm range. Again, I didn't allow them to heat up.
 
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That may be somewhat part of it, but not much. Keep in mind your spectrometer is not as accurate as mine is. yours is +/- a couple nm, mine is +/-0.1nm. your range is much wider than mine, so your accuracy and drift are much more worse. yours may not always be quite perfect. These don't change WL really all that much with heat though tbh. even leaving it running it didn't really climb at all even as the heatsink got lightly warm. Temperature will have an effect on yours too probably to some degree, presuming the components have never shifted at all from being moved around and such.

That's kinda the downside of broadband spectrometers that are small like that. several smaller range ones are better generally than one broadband one...but of course there's a huge difference in cost too.
 
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My USB2000 isn't off by that much. It is within 0.3nm from what I can tell measuring against 473nm, 532nm 488nm, 632.8nm and a few others. I also have a B&W Tek calibrated that is within 0.1nm with a much higher lines/mm grating and they compare very closely. My Ocean Optics is not as wide as you remember now. It is 340nm to 850nm. Also, I've measure diodes for Singlemode Laser who works at the University of Berlin and the diodes I measured for him are very close to his spectroed measurements.
 
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Did you swap parts in it again? It was much wider than that last time. If you have data to back it up, then sure, you're a smart guy and I know you'd not post something inaccurate on a whim. the reader was only 2048 I think wide, so the range you have set up for it can only go so far. I been thinking of getting a newer one with the 40xx size pickup, so I can have more range without losing resolution. mine only goes from about 670-465ish or so i think. it doesn't do the deep reds and blues/violets.

(this is btw a good example of why you want to check your equipment periodically and test the same thing multiple times on different equipment to take an average when possible to get best results)
 
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I spent 8 months with Norm Hoffer at Ocean Optics to get mine reset and more accurate. I also spent a $$ hundred on it too. Now I've got 7 of the B&W Tek spectrometers with 1600 lines/mm IIRC. I have one set up to do 450nm to 650nm in 0.1 increments and plan on aligning two others to pick up the slack above and below that.

I've seen the wider CCDs, some as wide as 10 inches. That would be the way to go if I ever got a chance to snag one used for a reasonable price. Right now I'm trying to recuperate from a surgery that had me in the hospital for over a month. It sucks!

Edit: I always check my spectrometer before I use it with a reference close to what I'm measuring to see if it is still accurate or not.
 
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I believe it. I was considering calling them and asking if they could rebuild mine into a different configuration myself, but it's not pressing so I haven't done it.
 
When you do, ask for Norm Hoffer. He's a hell of a nice guy and was great to work with. I'll never forget him. :)
 
ultimatekaiser said:
(diode protection cuts in at about 175mA and shuts off the diode, likely to prevent damage, so I don’t think the diode liked going higher than this. Diode still works though just the same)
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I wasn't aware these diodes started to come with internal protection. I have an older SB147EC91 and it runs at 300mA just fine (I know I'm pushing).
 
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