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Old 07-06-2015, 03:32 AM #1
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Default 445 violet/blue laser question

I searched but I couldn't really find any answers . My question is that I've heard that blue lasers look rectangle and not round. If I have the laser not focused or infinity and I shine it on a wall half a mile away would it look rectangle or still be so small that it you can't tell either way. Also wondering how well the beam would look at night from a 445 1W violet laser, and would the beam look rectangle? Sorry I'm new to blue lasers. Thanks.



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Old 07-06-2015, 04:58 AM #2
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Default Re: 445 violet/blue laser question

none of the beams actually look rectangle.
When focused, they're all round.

I'm assuming they're referring to the raw output that comes from the diode. When shined on a wall it will be rectangular
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Old 07-06-2015, 11:42 AM #3
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Default

Quote:
Originally Posted by Mohrenberg View Post
none of the beams actually look rectangle.
When focused, they're all round.

I'm assuming they're referring to the raw output that comes from the diode. When shined on a wall it will be rectangular
All mine come out rectangular infinity or spread out. Some may be clipped by the size of the lens
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Old 07-06-2015, 06:22 PM #4
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Default Re: 445 violet/blue laser question

Mine, too, are all rectangular when shining at a distance, even when using a 3-element lens. I suppose it depends on the diode. The NDB7875, NDB7A75(the worst of these 3), and M140 diodes are all rectangular, for sure. What type of lens are you using?
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Old 07-06-2015, 06:38 PM #5
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Default Re: 445 violet/blue laser question

445nm isn't violet, it's blue, 405nm is violet. Yes any 445nm is rectangular, but when focused you won't notice it, but when unfocused or far away yes it will be rectangular. Something like a half a mile away I expect the dot would be very large.

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Old 07-08-2015, 04:03 AM #6
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Default Re: 445 violet/blue laser question

Quote:
Originally Posted by Pi R Squared View Post
445nm isn't violet, it's blue, 405nm is violet. Yes any 445nm is rectangular, but when focused you won't notice it, but when unfocused or far away yes it will be rectangular. Something like a half a mile away I expect the dot would be very large.

Alan
Yeah, i was referring to looking at the beam, like 3 or 4 feet away.

A square beam coming off a laser would be trippy though lol
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Old 07-08-2015, 10:00 AM #7
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Default Re: 445 violet/blue laser question

Quote:
Originally Posted by Pi R Squared View Post
Yes any 445nm is rectangular, but when focused you won't notice it, (...)
Are you sure?
Aren't there single-mode 445nm diodes? Or are they rectangular too?
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Old 07-08-2015, 10:11 AM #8
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Default Re: 445 violet/blue laser question

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Originally Posted by Cel View Post
Are you sure?
Aren't there single-mode 445nm diodes? Or are they rectangular too?
I think there's only one single mode 450, the 120mW PL450B. I don't think there's any single mode 445, if there is I am sure someone will tell us.

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Old 07-08-2015, 10:25 AM #9
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Default Re: 445 violet/blue laser question

Quote:
Originally Posted by Cel View Post
Are you sure?
Aren't there single-mode 445nm diodes? Or are they rectangular too?
Quick search gave me this:
Single mode laser diode at 445nm

Don't know if that's what you're looking for

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Old 07-08-2015, 10:47 AM #10
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Default Re: 445 violet/blue laser question

Quote:
Originally Posted by LeHap View Post
Quick search gave me this:
Single mode laser diode at 445nm

Don't know if that's what you're looking for

-Alex
That is exactly what we were looking for, thanks for posting that. I had no idea there was a 50mW single mode 445nm diode. It would have been nice if they were reasonably priced, $290. I don't think I'll be buying one. The single mode 120mW 450nm is really cheap.

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Old 07-08-2015, 10:49 AM #11
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Default Re: 445 violet/blue laser question

Quote:
Originally Posted by Pi R Squared View Post
That is exactly what we were looking for, thanks for posting that. I had no idea there was a 50mW single mode 445nm diode. It would have been nice if they were reasonably priced, $290. I don't think I'll be buying one. The single mode 120mW 450nm is really cheap.

Alan
Oh ok lol, your welcome!

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Last edited by Hap; 07-08-2015 at 10:49 AM.
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Old 07-09-2015, 07:40 PM #12
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Default Re: 445 violet/blue laser question

There is also the NDB7242E diode somebody on the forums is selling (I think they are still being sold). These are multimode, but with single mode-like divergence (really low from what I've hear). These are 445nm 50mW diodes (possibly the same as listed above)
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