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Old 03-01-2010, 08:24 PM #17
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Default Re: Possible range wit focus

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Originally Posted by nc9210 View Post
@lasersbee
Do you know a lens with a very high focal length?

@Arayan
Thank you for showing me the difference. If i expand the beam first and then focus for a long distance it will reduce uniformly and divergate again behind the focus. Ist this right? This looks like my experiment with the 2 magnifiers. But in my experiment i loose many light :-(

@steve001 WOW!

I have never seen anything like that. Do you know more about the used equipment? It seems to be a teleskope? Is it moified in any way? And what kind of laser is used? This looks like a fiber-bound type with any type of optic attached?

regards
Nicole
Like others have said. It is a reverse telescope, a Galilean telescope also know as a refractor telescope. Look up Galilean laser beam expander.


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Old 03-01-2010, 08:31 PM #18
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Default Re: Possible range wit focus

OK, i begin to understand. And now (i read the laserglow pages) i know that the used laser is a DPSS type. The beam expander used in he video is not shown at laserglow. Is this a prototype?
As shown at laserglow a beam expander available from stock is aplicable for low distances only. I think, i try a telescope and will see what happens.

Regards
Nicole
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Old 03-01-2010, 08:44 PM #19
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Default Re: Possible range wit focus

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...As shown at laserglow a beam expander available from stock is aplicable for low distances only.
I have not read the specifications but I believe it can also be used for long distances

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Old 03-01-2010, 09:12 PM #20
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Default Re: Possible range wit focus

Hey nc9210....

you will need to learn to use the internet....
Like Google search and eBay search....

New and used laser beam expander, Business Industrial on eBay.ca.....


Jerry
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Old 03-01-2010, 09:37 PM #21
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Default Re: Possible range wit focus

this diagram shows the possibilities:

(If not allowed to post pictures i will delete it immediately)

I've just tested a " 3x video tele attachment" with a really good result (5mm and sharp).
But the beam was not expanded, only summarized. The next days i check this item at a long distanceand report what happens ...
Then i used a binocular 8x40 but the point is not small and not sharp :-(

Regards
Nicole

PS @lasersbee
there are more items on ebay, but no one ist described especial for long distance.
Only 2 items are 10x extenders - unfortunally both galilean types ...

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Old 03-01-2010, 10:25 PM #22
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Default Re: Possible range wit focus

It is not important that it's Galilean (almost all beam exoaders are galilean) or not as the result is the same: small divergence!

See the arrow in picture...

The laser "burning power"= (power)/3.14(beam diameter+beam divergence*distance)A2/2
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Old 03-01-2010, 11:26 PM #23
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Default Re: Possible range wit focus

Quote:
Originally Posted by Arayan View Post
It is not important that it's Galilean (almost all beam exoaders are galilean) or not as the result is the same: small divergence!

See the arrow in picture...

The laser "burning power"= (power)/3.14(beam diameter+beam divergence*distance)A2/2
The important difference between Keplerian and Galilean is the former has a longer construction length the latter a shorter length.
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