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FrozenGate by Avery

Mitsubishi 635nm diode divergence at 350 feet

Nice job with the comparison.

ElektroFreak said:
To be fair they are worse than the 445s, I wouldn't want to inadvertently foster that idea, but for a handheld laser that you're going to shine into the sky or across a room i don't think it's necessary to get into corrective optics. I'm never one to say that there's something wrong with the pursuit of perfection, in fact those who want to experiment with optics to obtain the very best beam possible are to be commended IMO, but I don't feel bad about having a little handheld that has a bit of a wider flatter beam than normal.. still looks like a laser to me and everyone I show it to..
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++ to this. To the average person a fat beam is more impressive anyways.
 





ElektroFreak said:
The same kind of silly-good divergence can be had from the single-mode 635nm optnext diodes too.. but they do cost a good bit more. Probably worth it actually, but I wonder if they're as robust as these multimodes are.
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Oath!

i put my 770mW 635nm Mitsubishi next to my 210mW optnext 635nm and the difference is just ridiculous!

tho the optnext is more than twice the price of the mitsubishi....
 
Great comparison! (+1)

I´m looking forward to the day I can get one in a medium-sized handheld with a "good" divergence, at least like with the 445nm, and with >700mW power :)
 
I don't know if that'll ever happen. I'm not an expert in the manufacture of laser diodes, but I think that the wavelength of the light produced has some influence on the beam properties of these new types of multimode diodes. The blue diodes have lower natural divergence than the reds, seemingly proportional to the difference in wavelength, even though the structure of each is very similar. Therefore I don't think that reds will ever have the same natural beam properties as blue diodes with the same structure. The future will no doubt hold new types of structures that will outperform what we see today though.
 
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^^That's correct. The lasing wavelength that is emitted from the die greatly affects the fast axis to slow axis divergence ratio. You'll see that the future multi-mode 525nm diode will have divergence comparable to the 445s.
 
mfo said:
Ok, so this is weird as it came to me in a dream (lol) so it's probably not going to work.

What about a convex lens, but with a lip around the edge?
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Can you draw something up? The only potential problem I can think of without being sure I'm understanding what you mean is that the lens you describe sounds difficult to make.
 
Blord said:
Good dot comparison. The good old red laser has the best divergence.
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And that's why I still enjoy my good old-fashioned 660nm red pocket mini.

Ash - Great video. I wish I had some nice safe unbroken space to run my lasers long distance. You helped make up my mind to what type of 635nm diode I'd like to use in my next build.
 
ElektroFreak said:
Can you draw something up? The only potential problem I can think of without being sure I'm understanding what you mean is that the lens you describe sounds difficult to make.
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Hmm. This might sound a tad perverted, but I think it'll get the point across.

You know how when you take a condom out of the wrapper, how the edges are thick since it's rolled up? What if the edge of the lens sort of had that thickness to it?

Oh yeah, and I suck at drawing. If need be though, I'm sure I could come up with something.
 
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mfo said:
Hmm. This might sound a tad perverted, but I think it'll get the point across.

You know how when you take a condom out of the wrapper, how the edges are thick since it's rolled up? What if the edge of the lens sort of had that thickness to it?

Oh yeah, and I suck at drawing. If need be though, I'm sure I could come up with something.
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And so the condom lens is born!:crackup:
 
Ash said:
Here is a video I just shot of my 365mW mitsubishi 635nm from a distance of 350 feet.
The "dot" is more than 24 inches across at this distance. :p

The other lasers are a 1.1W 445nm, a 180mW 660nm, and a 65mW "cute" green. :D
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Hi, can I ask how big is the other red "dot"? Looks like about 1" diameter? Is there anything available "off the shelf" that can achieve this?
 
mfo said:
Lmfao!

If someone makes this, I want credits.

But seriously, I don't know why this lens came to me in a dream. I think I need to stay away from lasers for a while =\
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Actually I'm 90% certain I've seen a lens like that somewhere. Much thicker toward the edges, thinner in the middle.... but can't for the life of me remember where. Possibly it's a childhood memory... my grandfather had loads of magnifying lenses lying around all the time.

You get the credit for the idea... but I coined the term:na:

eytyxhs said:
That is really bad. :(
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Actually it's better than what I expected. Yes it's worse than 445's, but it's still perfectly serviceable as a pointer.

To date I've never had anyone say "hey that's a weird dot".... I think we're just a bit anal about these kinds of things.

Crossfire said:
Recommended for use with the Dilda Lazor. :na:

Yup, that was cheap.
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Yup, always use proper protection:shhh:

Erm... dust cap:p
 
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