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Old 10-15-2008, 07:07 PM #1
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Default THree lasers in one diode???

Is this some kind of joke?
http://cgi.ebay.co.uk/blu-ray-405nm-...d=p3286.c0.m14

Would it be possible to put in 3 "diodes" in one diode? Sounds pretty weird.


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Old 10-15-2008, 07:10 PM #2
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Default Re: THree lasers in one diode???

This is simply the diode from PS3 sled. It has all of the "chips" in the same diode. However, you can only really run one at a time. Only one person that I know of was successful at running both the 405nm and the 660nm at the same time.

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Old 10-15-2008, 07:40 PM #3
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Default Re: THree lasers in one diode???

Here's a TON of pics of what this diode can do (from page 8):


http://s279.photobucket.com/albums/k..._01/?start=140


You can't collimate it with two diodes on at the same time tho.
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Old 10-15-2008, 08:58 PM #4
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Default Re: THree lasers in one diode???

Quote:
Originally Posted by FireMyLaser
Here's a TON of pics of what this diode can do (from page 8):


http://s279.photobucket.com/albums/k..._01/?start=140


You can't collimate it with two diodes on at the same time tho.
why not? :-/
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Old 10-15-2008, 09:02 PM #5
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Default Re: THree lasers in one diode???

Quote:
Originally Posted by HumanSymphony
[quote author=FireMyLaser link=1224097648/0#2 date=1224099636]Here's a TON of pics of what this diode can do (from page 8):


http://s279.photobucket.com/albums/k..._01/?start=140


You can't collimate it with two diodes on at the same time tho.
why not? :-/[/quote]

They have different focal lengths

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Old 10-15-2008, 09:08 PM #6
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Default Re: THree lasers in one diode???

Quote:
Originally Posted by daguin
[quote author=HumanSymphony link=1224097648/0#3 date=1224104334][quote author=FireMyLaser link=1224097648/0#2 date=1224099636]Here's a TON of pics of what this diode can do (from page 8):


http://s279.photobucket.com/albums/k..._01/?start=140


You can't collimate it with two diodes on at the same time tho.
why not? :-/[/quote]

They have different focal lengths

Peace,
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So they would diverge differently AND have different size beams, but it would work somewhat yes?
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Old 10-15-2008, 09:22 PM #7
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Default Re: THree lasers in one diode???

Quote:
Originally Posted by HumanSymphony
[quote author=daguin link=1224097648/0#4 date=1224104542][quote author=HumanSymphony link=1224097648/0#3 date=1224104334][quote author=FireMyLaser link=1224097648/0#2 date=1224099636]Here's a TON of pics of what this diode can do (from page 8):
http://s279.photobucket.com/albums/k..._01/?start=140
You can't collimate it with two diodes on at the same time tho.
why not? :-/[/quote]
They have different focal lengths
Peace,
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So they would diverge differently AND have different size beams, but it would work somewhat yes?[/quote]

Yes. It would work "somewhat." See FireMyLaser's link above.

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Old 10-15-2008, 09:25 PM #8
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Default Re: THree lasers in one diode???

Yes it works somewhat decent for a few meters, then it becomes more like a flashlight if you try to match the divergence on both wavelengths.


The reason why it doesn't work is that different wavelengths diffract differently, like white light through a prism. It's the same deal if you use a lens.
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Old 10-16-2008, 06:07 AM #9
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Default Re: THree lasers in one diode???

Wow!
I really need to freshen up my optics. I have forgotten everything over the summer. But now when you want to know because of something interesting it might actually be fun to read more about it all.
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Old 10-16-2008, 06:10 PM #10
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Default Re: THree lasers in one diode???

Quote:
Originally Posted by FireMyLaser
Yes it works somewhat decent for a few meters, then it becomes more like a flashlight if you try to match the divergence on both wavelengths.


The reason why it doesn't work is that different wavelengths diffract differently, like white light through a prism. It's the same deal if you use a lens.
One small thing, trivial to some but very important to others. *The light refracts differently, not diffract. *Diffraction happens when a wave encounters objects that are spaced on the same order of magnitude as the wavelength of the wave. *Refraction happens when moving from one medium to another. *A visible light wave doesn't "see" atoms, it "sees" slits like in diffraction gratings, what's when it diffracts. *They behave very differently. *With optical materials, or really pretty much all solid matter in the case of x-rays, visible light refracts and x-rays diffract.

Another bit of nomenclature for the OP, it's really not a diode in a diode. *The cylinder you see is really just a container for the diode, which is actually just the little chip inside the container. *With the PS3 diodes, there are 3 diodes, 3 little chips, inside that same cylindrical container, but it is still easy to just say "diode" for the whole thing.

But yes, index of refraction is wavelength dependent. *The index of refraction of a prism just has a larger dependence than other materials. *You know that expensive "crystal" glassware that people buy? *It's really just glass with more lead added to it. *The lead increases the index of refraction, but that increase also increases the dependence of the index of refraction on wavelength (if you plot index on y axis vs. wavelength on x axis, it's roughly a negative slope line, top left to bottom right. *Putting the lead in moves that line up and makes it steeper, the left side increases more than the right does). *So yeah, adding lead to glass makes it cost much more money in the store. *And the name "crystal" for that stuff is the worst name ever, since it's still a glass.
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Old 10-17-2008, 03:39 AM #11
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Default Re: THree lasers in one diode???

Yep -- I ran both the red and Blu at the same time but at reduced power. I also had minimal TEC cooling. You will get two different blobs of light because the lens focuses differently. I didnt run it long because the LD's dies are stacked and the heat from the red has to go through the Blu to get to the heatsink.

In short, It can be done but just for fun.

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