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470nm diode

rhd

rhd

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qumefox said:
The laser you sent me Ablaze most definitely has a TO-3 diode in it. NOT a TO-18. I didn't do a full teardown on it since it doesn't belong to me. However.. it's not hard to tell by unscrewing the lens and looking at the visible part of the can/diode window. it's much smaller than a TO-18..
Click to expand...

TO-3? Now I'm really confused. TO-3 is considerably larger than a TO-18, and often contains an entire C-Mount embedded inside of it.

qumefox said:
Actually, all diodes should demonstrate this behavior, since it's a function of the cavity size increasing as the temperature goes up.. It just might not be as prevalent in low power diodes due to their inability to handle as much current, and therefor generate as much heat.

This is also true for reds.. I imagine if people start measuring these 300mW 635nm diodes when overdriven to 600-700mW.. They'd find they're considerably higher than 635.. Wouldn't surprise me if they weren't up in the 640's. Granted it's still better than overdriven 660s, which can end up over 670.
Click to expand...

The Mitsubishi 635s hit 642 or so at around 1A. Quite a shift. Cyparagon's third chart (here) is quite telling. Push them to 1.5A, and you've basically got a 650nm diode!

That said, I was fairly certain that even 445 multi-mode diodes only wavered a nm or two as a result of current and heat increase. IE, the natural (random seeming) variance from diode to diode is substantially larger than the wavelength shift that you'll experience per diode as temperature and current increases.

That was my understanding, but I won't put that out there as fact. I haven't calibrated my spectrometer yet, so I'm just relying on second hand info.
 
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bennett326

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rhd said:
TO-3? Now I'm really confused. TO-3 is considerably larger than a TO-18, and often contains an entire C-Mount embedded inside of it.



The Mitsubishi 635s hit 642 or so at around 1A. Quite a shift. Cyparagon's third chart (here) is quite telling. Push them to 1.5A, and you've basically got a 650nm diode!

That said, I was fairly certain that even 445 multi-mode diodes only wavered a nm or two as a result of current and heat increase. IE, the natural (random seeming) variance from diode to diode is substantially larger than the wavelength shift that you'll experience per diode as temperature and current increases.

That was my understanding, but I won't put that out there as fact. I haven't calibrated my spectrometer yet, so I'm just relying on second hand info.
Click to expand...

wow now 445s shifted quite abit letme go get the link to the charts for ya
 
qumefox

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rhd said:
TO-3? Now I'm really confused. TO-3 is considerably larger than a TO-18, and often contains an entire C-Mount embedded inside of it.
Click to expand...

Sorry, left out a digit.. Should be TO-38 I believe. It's been fixed.

Regardless. Pictures speak a thousand words.. So.. definitely not a TO-18 regardless of what you call the 3.8mm package. :p

100_0795.JPG
 
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bennett326

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well rhd cyp gave me a link to a thread on pl showing WL shifts and power testing on tons of cr@pi0 diodes, but i cant find it mabye he can give it to us again LOL
 
qumefox

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bennett326 said:
cr@pi0
Click to expand...

I honestly don't understand why people use this particular substitution.. I'd think people should be appreciative these diodes are available at all. After all, the only restrictions that's been placed on us is not using this companies name.. They could always make the diodes a LOT harder to extract by potting them you know.
 
lasersbee

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qumefox said:
I honestly don't understand why people use this particular substitution.. I'd think people should be appreciative these diodes are available at all. After all, the only restrictions that's been placed on us is not using this companies name.. They could always make the diodes a LOT harder to extract by potting them you know.
Click to expand...

That is because a while ago there was a problem using the
real name written as it should be due to some legal issues...

Unless you are referring to these exceptional diodes being
called crap.. then I agree...


Jerry
 
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qumefox

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There are other ways to get the meaning across without calling them 'crapio'
 
rhd

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lasersbee said:
That is because a while ago there was a problem using the
real name written as it should be due to some legal issues...

Unless you are referring to these exceptional diodes being
called crap.. then I agree...
Click to expand...

I think that IS what he was taking objection to.

I've always used "KasEO" - I think it gets the point across, without an negative connotations.
 
Ablaze

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I'm a little confused too.. from the discussion earlier in this thread I thought that a 445nm and a 450nm were a different laser, and when I look at that reading I see a 450 rather than a 445.

That's strange.. I asked him for the diode in that blue there and he said "We use to18 sealed diode for 470nm , The unit price is USD66/PC Base on MOQ 100PCS." But obviously I can't trust any of his technical specs.

Thanks again for the info qume. A matter of a few days in shipping don't matter to me, I have no immediate use for that diode.
 
jeffreythe00

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@op

That is a very nice laser module you have. It might not be 470nm (bummer :( ) but it is nice nonetheless.
 
bennett326

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i am oh so sorry that saying cr@pi0 bothers you LOL its just what i have seen said so thats the way i have typed it heh..

@ablaze diode lasers vary in WL a bit just because it says its 445 doesnt mean it cant shift a bit. DPSS lasers dont shift at all IIRC. the 445 and 450 are a different diode one comes out of the KAisi0 (better qumefox?) projector and one is a raw diode IIRC. and the single mode is 3.8mm not 5.6mm and is single mode and i believe is used in pico projectors..

EDIT i think people said Cr@pi0 because of how much sh!t they where giving the forum not the diodes are crap that the legal crap is crap IDK LOL
 
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rhd

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There's no confusion left here.

- This is the OSRAM or Opnext single mode blue diode, in a housing with a driver
- As would be expected for these diodes, it is ~450nm
- It's a TO38 3.8mm diode
- These diodes are available for $59 from Rayfoss

No mystery. Your source didn't design this diode, even though they told you they did. They MAY have put it into the module and attached a driver. Although I doubt they even did that, since they didn't even know the wavelength OR SIZE of the diode inside ;)
 
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