[Laser] Re: Beam Expanders

Wed, 23 Jul 2003 11:19:59 EDT

In a message dated 7/23/03 1:20:58 PM GMT Daylight Time, [email protected] 
writes:

> 
> [email protected] wrote:
> Hi,
> I am afraid I don't fully understand. The narrowest beam will indeed be
> more affected by
> scattering, but if you are using a beam *expander*, shouldn't you
> actually see less flutter?
> 
> Angel Vilaseca HB9SLV
> 
> 

The term 'expander'  is confusing......Sorry.

Although the beam is expanded at the transmit end, the divergence is much 
reduced.
So, at a distant point the beam is a much smaller diameter than it would 
normally be.

In my case the path was over warm ground at both ends and cold water in the 
middle. Probably a very poor path for refractive index changes etc.

73

David     <A HREF="www.g0mrf.freeserve.co.uk/laser.htm">www.g0mrf.freeserve.co.uk/laser.htm</A>

PS  Here in the UK, long line of sight paths are difficult to find.  I'm 
planning to go to Tenerife in January and there are some very nice 100km paths 
between the islands.
I can just about get my laser kit in the suitcase!   I already have the 
nautical charts and have plotted paths between a few high points which are above 
cloud level.......
Anyone  else planing a holiday at the same time?

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