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Old 09-04-2017, 05:55 AM #17
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Default Re: What Divergence should someone expect to see from a $15 Green Laser 532nm 80mW DP

My point of saying it was still round is because when the dot is very small it becomes more difficult to tell just how round it really is, I've seen a beam that seemed to be fairly round when it was small but after it's had some distance to diverge a bit it turns out not to be as round as first thought......


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Old 09-04-2017, 06:12 AM #18
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Default Re: What Divergence should someone expect to see from a $15 Green Laser 532nm 80mW DP

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Originally Posted by Accutronitis View Post
My point of saying it was still round is because when the dot is very small it becomes more difficult to tell just how round it really is, I've seen a beam that seemed to be fairly round when it was small but after it's had some distance to diverge a bit it turns out not to be as round as first thought......
Yup, can be hard to see up close, usually easier to see with a pair of laser goggles on. Best method to see beam shape is just to defocus the laser and see what it looks like.

What I said doesn't hold true for all cases anyway, if the divergence is asymmetrical then the beam shape won't remain constant as it propagates, multimode diodes are a prime example of that.

Great beam specs and low divergence are great, you should get into gas lasers.
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Old 09-04-2017, 06:15 AM #19
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Default Re: What Divergence should someone expect to see from a $15 Green Laser 532nm 80mW DP

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you should get into gas lasers.
Believe me i'd love to but, You know, Money and all that......

Quote:
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multimode diodes are a prime example of that.
Yup, even after correction the fast axis of a 44 still isn't as well behaved as the slow axis, Or that is how it seems to me ?

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Old 09-04-2017, 06:37 AM #20
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Default Re: What Divergence should someone expect to see from a $15 Green Laser 532nm 80mW DP

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Originally Posted by Accutronitis View Post
Believe me i'd love to but, You know, Money and all that......

Yup, even after correction the fast axis of a 44 still isn't as well behaved as the slow axis, Or that is how it seems to me ?

Yup, money and space, at least in my case. I don't have anywhere to put anything bigger than my 163!

That said, you can find HeNes for cheap from time to time, that's a start.

You should be able to correct the fast axis so that it has the same divergence as the slow axis, but getting it perfect probably isn't worth the effort. You're still going to end up with a nasty square/rectangular beam either way. You could make it round but it's not worth the effort and any correction you do requires sacrificing output power.
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445nm | Sanwu Laser Pocket Series | 400mW Metered
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450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
473nm | B&W Tek BWB-10-OEM | Ordered
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



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Old 09-04-2017, 06:44 AM #21
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Default Re: What Divergence should someone expect to see from a $15 Green Laser 532nm 80mW DP

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Originally Posted by diachi View Post
You should be able to correct the fast axis so that it has the same divergence as the slow axis
I believe I'm pretty dang close to that with it right now (same divergence not shape) even if it's not really near round with it's very square beam, Close enough to where i'm not going to change anything with it anymore......

It is how it is and it's going to stay how it is.... lol

Last edited by Accutronitis; 09-04-2017 at 06:59 AM.
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