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FrozenGate by Avery

1 Watt 638nm Red Diodes !!






Those have already been posted here.. unfortunately due to the fact that they are multimode with a large emitter size it's very difficult to get a low-divergence narrow-diameter beam from them, making them less than appealing for most hobbyists. They behave sort of like a red flashlight in terms of the kind of beam they produce.
 
ElektroFreak said:
Those have already been posted here.. unfortunately due to the fact that they are multimode with a large emitter size it's very difficult to get a low-divergence narrow-diameter beam from them, making them less than appealing for most hobbyists. They behave sort of like a red flashlight in terms of the kind of beam they produce.
Click to expand...

The reds that I have are c-mount .5 - 1W. The raw output puts a line on the
wall approx 7ft wide at approx 5ft away..

Less than appealing is a nice way to put it...
 
ElektroFreak said:
Those have already been posted here.. unfortunately due to the fact that they are multimode with a large emitter size it's very difficult to get a low-divergence narrow-diameter beam from them, making them less than appealing for most hobbyists. They behave sort of like a red flashlight in terms of the kind of beam they produce.
Click to expand...

Oh. Sorry for raising anyone's expectations. :o
 
even if 9mm it would still be great for projectors.
i sent them an email with various questions. I'll keep you posted if they actually give me pricing.

michael.
 
I'm fairly certain those OpNext diodes are very highly sought after. I know that the 150mW version is an excellent diode, being short-wavelength and single-mode.. I ran across the info not long ago that Arctos (a leading German laser show manufacturer) is using 640nm OpNext diodes in their huge red arrays.
 
i got a reply back from them... in qty's of 1-24 they are 260usd. in qty's over 1000 they are 94usd.


michael.
 
Or just one person that buy 1000 pieces and sells for $95 each.
 
ElektroFreak said:
Those have already been posted here.. unfortunately due to the fact that they are multimode with a large emitter size it's very difficult to get a low-divergence narrow-diameter beam from them, making them less than appealing for most hobbyists. They behave sort of like a red flashlight in terms of the kind of beam they produce.
Click to expand...

I am sure this has been discussed before but on these diodes how much worse would it be in comparison to the multimode output on the 445?
 
DTR said:
I am sure this has been discussed before but on these diodes how much worse would it be in comparison to the multimode output on the 445?
Click to expand...

Hard to say, exactly. Diodes from optical storage drives (660nm red diodes from DVD, 405nm diodes from Blu-Ray or HD-DVD) typically have a ridge width of about 1.5um, giving single lateral mode operation, since only the fundamental mode fits.

The 445nm diodes we're using now have a ridge that is about 15 um wide, and you can see how that affects the divergence vs. the violet diodes, the wider ridge is worse.

Anecdotally, I've read on PL that these red diodes have a 40um ridge. So it would definitely be worse than the 445nm diodes we're using now, but how much worse is a good question. There are other factors besides just ridge width, but it gives an idea that they are worse.
 
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