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Old 07-12-2008, 10:50 AM #1
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Default What to do with those KES-400A multicolor diodes:

Build multiple drivers for them and fit them inside an Aixiz somehow, of course! (yes, my miniature skills again)

First I had to find the maxima of the two remaining lasers. I drew this graph and concluded that the red may have slightly more juice, 76mA. The UV is safest at 74ma. They give off about the same amount of light. I noticed that the RED operates at TEM00+TEM10. Luckily, with this 'wider' beam, it overlays with the UV nicely. When under powering both RED and UV red such that RED operates at TEM00, the UV looks much wider.

(The IR turned out to be only a useless 14mW, so I skipped that from now on)



I also attached a four-step switch to change between RED, MAGENTA, PURPLE and VIOLET. I dimensioned the purple, such that both colors look equally bright to the eye. Magenta is maximum of both, and incidentally looked exactly magenta.

The only problem is that both wavelengths are refracted quite differently by the acrylic lens, so they can't be collimated at the same time. When I turn the lens such that one expands and the other contracts, then they can meet at a certain distance, with increased spot size, but with a uniform color. At [s]15[/s] 10 foot this spot is about 1".

It's not so clear in the picture, but there is actually lots of spare room. Mainly in thickness, but also in height (one row of four holes is practically wasted). And yes, it does become hot, but only after s duty cycle of 3+ minutes.









I photoshopped the last two photos to look more like what the eye sees, because the camera extremely overreacts to UV light


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Old 07-12-2008, 11:22 AM #2
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Default Re: What to do with those KES-400A multicolor diod

[smiley=tekst-toppie.gif] I cannot find a smilie with a cap being doffed but that desrves one....I like small

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Old 07-12-2008, 01:02 PM #3
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Default Re: What to do with those KES-400A multicolor diod

Very cool! How much run time has it had with both die's running at full power??
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Old 07-12-2008, 02:09 PM #4
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Default Re: What to do with those KES-400A multicolor diod

Ehm, if you mean duty cycle, about 3 minutes. In total, about 10 minutes, and still running ok.
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Old 07-12-2008, 11:52 PM #5
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Default Re: What to do with those KES-400A multicolor diod

Incredible!

I always wanted to try this with my ps3 diode, but everyone kept saying you couldn't power both at the same time or it would lead to immediate COD.
In the meantime I've been trying various things with dichros and separate R and V diodes... I'll have to take some pics and post those.. at least with the two diodes version I can get about 10x the power as a PS3 diode :P
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Old 07-13-2008, 10:43 AM #6
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Default Re: What to do with those KES-400A multicolor diod

Quote:
Originally Posted by pseudolobster
I always wanted to try this with my ps3 diode, but everyone kept saying you couldn't power both at the same time or it would lead to immediate COD.
I've never heard of that. It does look like they emit from almost the same spot. when I look at the bare diode with a 40x magnifier, I still can not see a positional difference of the output spot for red and violet. One thing for sure is that both colors don't use the same cavity It wouldn't make sense for a cheap diode. The die of the red looks like its on top though, and upside down or something. I can imagine running both at the same time will heat up the violet die even more, causing reduced lifetime. I run it from a rechargeable 9V battery and it depletes fairly quickly so I'm guessing I'm a bit safer than running it at maximum all the time.

PS, you don't have any lasers right?
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Old 07-14-2008, 02:13 PM #7
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Default Re: What to do with those KES-400A multicolor diod

OMG you mean that PS3 diode is aactually 3 diodes in one?
One red, one blu-ray and one infrarred?

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Old 07-14-2008, 11:19 PM #8
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Default Re: What to do with those KES-400A multicolor diod

Quote:
Originally Posted by Zom-B
PS, you don't have any lasers right?
Since I created that sig I've made a 200mW short open can red that I made an LED out of, a ps3 diode I zombified, and a 803t that took a shard of glass to the die... for the length of time I've had any of those it was easier to not update my sig.

Anyways I seem to recall that the r and v lasers are mounted side-by side on the substrate and obviously use separate cavities, which is why I figured that was BS and aside from heat issues there should be no problems running them simultaneously...

edit: on further investigation it seems the red and ir are side by side, whereas the 405 is the bottom layer.. meaning all heat generated by the red must pass through the violet layers...
from the patent:
Quote:
Although heat is also generated at the time of light emission, since the first substrate 21 is made of a material having relatively high thermal conductivity, the heat generated by the lasing portion 40 or 50 is promptly dissipated via the first substrate 21 and the supporting base 11 . The heat generated by the first light emitting element 20 is promptly dissipated via the supporting base 11 .
but it seems they anticipated that and designed around it.. anyways, keep us updated on how long it lives.. despite being low powered, that's an awesome color!
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Old 07-15-2008, 01:14 AM #9
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Default Re: What to do with those KES-400A multicolor diod

A UV and Magenta Laser!?!?!??! NO WAY!!!!
Is it actual UV or only 405nm? Imagine making a Magenta pointer... *drool*
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Old 07-15-2008, 01:22 AM #10
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Default Re: What to do with those KES-400A multicolor diod

Quote:
Originally Posted by Spyderz20x6
A UV and Magenta Laser!?!?!??! NO WAY!!!!
Is it actual UV or only 405nm? Imagine making a Magenta pointer... *drool*
It's a 405nm diode out of a Playstation3's bluray drive.

They use a stacked diode assembly with red, ir, and violet in a single can. No need to imagine making a magenta pointer, as you can see from the pictures, Zom-B has already accomplished this.
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Old 07-15-2008, 01:50 AM #11
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Default Re: What to do with those KES-400A multicolor diod

Quote:
Originally Posted by pseudolobster
[quote author=Spyderz20x6 link=1215859801/0#8 date=1216084467]A UV and Magenta Laser!?!?!??! NO WAY!!!!
Is it actual UV or only 405nm? Imagine making a Magenta pointer... *drool*
It's a 405nm diode out of a Playstation3's bluray drive.

They use a stacked diode assembly with red, ir, and violet in a single can. No need to imagine making a magenta pointer, as you can see from the pictures, Zom-B has already accomplished this.[/quote]
I know what a KES-400A is...
405nm is not UV, i thought he accomplished making ACTUAL UV, in the 300nm range...
Wow... a Magenta Pointer... Is it coherent?
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Old 07-15-2008, 02:10 AM #12
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Default Re: What to do with those KES-400A multicolor diod

Quote:
Originally Posted by Spyderz20x6
I know what a KES-400A is...
405nm is not UV, i thought he accomplished making ACTUAL UV, in the 300nm range...
Wow... a Magenta Pointer... Is it coherent?
inconsequential rant on semantics:

&quot;Ultra Violet&quot; literally means &quot;above violet&quot; or &quot;beyond violet&quot;, so anything that's a lower wavelength than violet is considered &quot;ultra&quot; violet.
Scientific definitions of UV are vague and usually set the lower limit of UVA between 380nm and 420nm, so 405nm, being a deeper shade of violet, falls well within the range of being called ultraviolet... besides it's much easier to type UV than &quot;near-ultraviolet&quot; and everyone around here will know what you mean. If he used an actual mid-to-deep-ultraviolet diode (which I'm not sure if even exist outside of dpss models) along with a red diode, the beam would appear red, since you wouldn't be able to see the UV.

Anyways, unless his diode is 100nm out of spec, it's pretty clear he's using 405nm light here.. as you can see from the pics, there's only one can there, and I'm pretty confident he didn't custom make that diode by hand.
The light is not monochromatic magenta light, but is made of two colors. The individual colors are coherent, but they're not mutually coherent.
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Old 07-15-2008, 02:31 AM #13
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Default Re: What to do with those KES-400A multicolor diod

Quote:
Originally Posted by pseudolobster
[quote author=Spyderz20x6 link=1215859801/0#10 date=1216086606]
I know what a KES-400A is...
405nm is not UV, i thought he accomplished making ACTUAL UV, in the 300nm range...
Wow... a Magenta Pointer... Is it coherent?
inconsequential rant on semantics:

&quot;Ultra Violet&quot; literally means &quot;above violet&quot; or &quot;beyond violet&quot;, so anything that's a lower wavelength than violet is considered &quot;ultra&quot; violet.
Scientific definitions of UV are vague and usually set the lower limit of UVA between 380nm and 420nm, so 405nm, being a deeper shade of violet, falls well within the range of being called ultraviolet... besides it's much easier to type UV than &quot;near-ultraviolet&quot; and everyone around here will know what you mean. If he used an actual mid-to-deep-ultraviolet diode (which I'm not sure if even exist outside of dpss models) along with a red diode, the beam would appear red, since you wouldn't be able to see the UV.

Anyways, unless his diode is 100nm out of spec, it's pretty clear he's using 405nm light here.. as you can see from the pics, there's only one can there, and I'm pretty confident he didn't custom make that diode by hand.
The light is not monochromatic magenta light, but is made of two colors. The individual colors are coherent, but they're not mutually coherent.[/quote]
So, are you able to focus the magenta light? Since the waves travel out of step?
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Old 07-15-2008, 02:53 AM #14
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Default Re: What to do with those KES-400A multicolor diod

Focusing the light would be hard, but it has nothing to do with waves being out of step or coherence. Different wavelengths are refracted by different amounts - IE through a lens violet light will bend more than red. Its the same effect you see when you see a rainbow or shine white light into a prism and it gets spit up. It is possible to correct for this discrepancy using more expensive achromatic lenses, or very expensive apochromats, but a typical lens will not be able to bring both wavelengths to the same focus.
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Old 07-15-2008, 05:22 AM #15
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Default Re: What to do with those KES-400A multicolor diod

Got an old flatbad scanner collecting dust? rip out the objective lens and Walah.. instant laser diode achromatic collimator! 8-)
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Old 07-15-2008, 11:00 AM #16
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Default Re: What to do with those KES-400A multicolor diod

Isn't that a cylindrical lens? I once ripped apart a flatbed scanner way before I started with lasers, and it had a linear photoarray. It doesn't make sense to put a spherical lens there (unless they're cheaper)
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