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Old 09-14-2007, 06:10 PM #1
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Default Negative divergence... cant be this simple...

How does one go about setting up a lens for negative divergence? The reasoning in my head says you just need a convex lens mounted at the right distance from the LD... I know it cant possibly be this simple though...


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Old 09-14-2007, 07:10 PM #2
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Default Re: Negative divergence... cant be this simple...

Just put your collimater lens closer to LD than the lens Focal point.
That makes beam waist converge to a point.

If you can find a longer focal lenth Collimater lens the beam waist will be bigger but spead less over distance. KEYWORD: miliradians.

If your laser is spec. .8 milliradians beam spot at 1000 meters is .8 meter diameter. (.0008 X 1000 = )

Hope I didn't write that backwards. ;D ;D


Cheers [smiley=beer.gif]
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Old 09-14-2007, 07:17 PM #3
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Default Re: Negative divergence... cant be this simple...

Negative divergence? What do you mean by that one? You mean getting the beam to converge to a focus? If you have a collimated beam, you just move the lens a little further from the source, and it will bring it to a focus.
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Old 09-14-2007, 07:20 PM #4
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Default Re: Negative divergence... cant be this simple...

wow it really is as simple as I thought...... so what was so special about WL's pulsar having a negative divergence then? I thought it must have took osme huge engineering marvel to create it or soemthing... what's the big deal?
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Old 09-14-2007, 11:20 PM #5
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Default Re: Negative divergence... cant be this simple...

Quote:
Originally Posted by Ashton
wow it really is as simple as I thought...... so what was so special about WL's pulsar having a negative divergence then? I thought it must have took osme huge engineering marvel to create it or soemthing... what's the big deal?
Sounds like another WL ploy on the unsuspecting buying public
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Old 09-15-2007, 05:44 AM #6
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Default Re: Negative divergence... cant be this simple...

well, yes and no, this one I cant fault them on, because it really IS unusual, however they blew it WAY out of proportion...
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