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Old 10-04-2008, 09:52 PM #1
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Default tune 650nm red laser to 635 nm???

hi, is there a simple method to "tune" a 650nm red laser to act as a 635nm laser? apert from buying an expensive tunable laser)


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Old 10-04-2008, 10:03 PM #2
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Default Re: tune 650nm red laser to 635 nm???

No, the band gap for the diode can't be changed and is ONLY one single color.

--hydro15
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Old 10-06-2008, 05:17 PM #3
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Default Re: tune 650nm red laser to 635 nm???

Quote:
Originally Posted by alibaba2
hi, is there a simple method to "tune" a 650nm red laser to act as a 635nm laser? apert from buying an expensive tunable laser)


i and about 10000 other people wish it was possible

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Old 10-06-2008, 06:03 PM #4
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Default Re: tune 650nm red laser to 635 nm???

No laser diode can be "tuned" to produce different colors (except for the ps3s, or other multi-laser diode in one can). Some diodes are +/- 5nm, but not by choice. What you see is what you get.
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Old 10-08-2008, 09:59 PM #5
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Default Re: tune 650nm red laser to 635 nm???

Quote:
Originally Posted by Ace82
No laser diode can be "tuned" to produce different colors (except for the ps3s, or other multi-laser diode in one can). *Some diodes are +/- 5nm, but not by choice. *What you see is what you get. *
What?! You can change the frequency of PS3 diodes? How? And what's the range?

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Old 10-08-2008, 10:11 PM #6
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Default Re: tune 650nm red laser to 635 nm???

Quote:
Originally Posted by rocketparrotlet
[quote author=Ace82 link=1223157149/0#3 date=1223316219]No laser diode can be "tuned" to produce different colors (except for the ps3s, or other multi-laser diode in one can). *Some diodes are +/- 5nm, but not by choice. *What you see is what you get. *
What?! *You can change the frequency of PS3 diodes? *How? *And what's the range? *

-Mark[/quote]

It's not how you're probably thinking. *There are actually 3 seprate lasers in the single ps3 can, that's why there are 5 pins, not 3, hence the 2 extra lasers, 2 extra pins (common ground for all). *There is a ~10mw 405nm, ~5mW 650nm, and (I believe to be ~10mW) Ir (not sure the exact wavelength. *Basically there's three diodes in one!

Edit: and I strongly believe that running more then one at a time would be very harmful to the diode because it will overheat.
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Old 10-08-2008, 10:15 PM #7
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Default Re: tune 650nm red laser to 635 nm???

Quote:
Originally Posted by rocketparrotlet
[quote author=Ace82 link=1223157149/0#3 date=1223316219]No laser diode can be "tuned" to produce different colors (except for the ps3s, or other multi-laser diode in one can). *Some diodes are +/- 5nm, but not by choice. *What you see is what you get. *
What?! *You can change the frequency of PS3 diodes? *How? *And what's the range? *

-Mark[/quote]


You cannot "tune" it. *The PS3 diode has violet, red, & infra-red "crystals" all in the same diode. *It has multiple "pins" on the back. *You have to "hook up" the pins you want to get the color your want. *It is POSSIBLE to hook up both the violet and the red, but I think only one member has been successful at getting it to live this way.

Peace,
dave

**EDIT**
I owe you a Coke, Ace

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Old 10-08-2008, 10:26 PM #8
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Default Re: tune 650nm red laser to 635 nm???

Quote:
Originally Posted by daguin
[quote author=rocketparrotlet link=1223157149/0#4 date=1223503172][quote author=Ace82 link=1223157149/0#3 date=1223316219]No laser diode can be "tuned" to produce different colors (except for the ps3s, or other multi-laser diode in one can). *Some diodes are +/- 5nm, but not by choice. *What you see is what you get. *
What?! *You can change the frequency of PS3 diodes? *How? *And what's the range? *

-Mark[/quote]


You cannot "tune" it. *The PS3 diode has violet, red, & infra-red "crystals" all in the same diode. *It has multiple "pins" on the back. *You have to "hook up" the pins you want to get the color your want. *It is POSSIBLE to hook up both the violet and the red, but I think only one member has been successful at getting it to live this way.

Peace,
dave

**EDIT**
*I owe you a Coke, Ace

[/quote]


8-) Now this feels weird, how the table has turned! ;D
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Old 10-08-2008, 11:25 PM #9
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Default Re: tune 650nm red laser to 635 nm???

Yep, what y'all said about the PS3 cans. But to add to it, it is 3 completely separate diodes, made out of completely separate things, then all just stacked together.

The red diode is likely something like AlInGaP/AlGaAs grown on a GaAs substrate. The violet is almost undoubtedly an InGaN/AlGaN/GaN laser grown on a sapphire substrate. The IR is likely something like GaAs/AlGaAs diode on GaAs as well. So the three separate diodes are made in completely separate places on different substrates in different machines, and with the diodes themselves probably having very different designs for how their materials are put together.

So really, it is three completely separate diodes crammed into one can. It is one of the sticky nomenclature situations you get into when referring to the whole 5.6mmcan package as a "diode", when really it is just a container for the tiny diode inside. Not usually a big deal, but every now and then it comes up.

Nice job backing each other up, though. Can a get a Coke, too? Getting thirsty, it's hot today.
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Old 10-16-2008, 12:12 AM #10
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Default Re: tune 650nm red laser to 635 nm???

Quote:
Originally Posted by Ace82
No laser diode can be "tuned" to produce different colors
*
Well, there is one way: temperature. But to get 15 nm off a 650 diode would require extreme measures in this department (think solid CO2 or liquid N2).
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