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Old 02-23-2011, 08:36 AM #1
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Default A Question About Divergence

Hello everyone,
I want to make an experiment about a divergence of a laser with shining it on to miles away and want to know how big the dot on the surface will be.I'm trying to gain technical information at the moment.
Okay, lets say I have a green laser with 0.9mrad beam divergence and I also have a 10X expander with it.So it is 0.009 mrad beam divergence right?
If I shine this laser to the black wall which is 5km away what will the size of the dot?
How can I calculate it?
0.09mrad means 0.09mm increase in the beam diameter per meters?
I'm so new about this experiments and just want to know about basics.


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Old 02-23-2011, 08:45 AM #2
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Default Re: A Question About Divergence

Here is the calculator pseudonomen137's JScript Diameter Calculator
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Old 02-23-2011, 08:49 AM #3
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Default Re: A Question About Divergence

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Thank you.This calculator will do great
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Old 02-23-2011, 08:26 PM #4
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Default Re: A Question About Divergence

0.9/10 is 0.09, not 0.009.

Theoretically, that would mean the dot is .09*5000 + original = 46cm or so.
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Old 02-24-2011, 01:00 PM #5
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Default Re: A Question About Divergence

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Originally Posted by Cyparagon View Post
0.9/10 is 0.09, not 0.009.

Theoretically, that would mean the dot is .09*5000 + original = 46cm or so.
Hmm 46cm is fair enough.Thank you.
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Old 02-24-2011, 01:43 PM #6
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Default Re: A Question About Divergence

I have a question about divergence.

Is the divergence on the laserglow green lasers for real? I mean, 0.14mRad and 0.12mRad is possible?
You think it have a FAT beam right? They say: 2mm beam @ aperture, 0.14mRad

Real?
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Old 02-24-2011, 02:44 PM #7
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Default Re: A Question About Divergence

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Is the divergence on the laserglow green lasers for real? I mean, 0.14mRad and 0.12mRad is possible?
Where are you reading this?
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Old 02-24-2011, 02:46 PM #8
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Default Re: A Question About Divergence

Here, you click "battery powered" and "Green". The aries and hercules are 0.14mRad and 0.12mRad.
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Old 02-24-2011, 07:22 PM #9
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Default Re: A Question About Divergence

That's WITH the optional beam expander in which case the beam would be 2cm at aperture. They're <1.2mrad without.
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Old 02-24-2011, 07:45 PM #10
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Default Re: A Question About Divergence

ooh thats the "*" means. Ok thanks.
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