>
>Do you realise what kind of laser you'd need to cut through those 
>conditions ? It would double as perimeter fence (loo the bright li...fzzzt).
>
>A relatively low frequency (~1296MHz) beam works well over a few 
>hundreds of meters in any weather.

Microwave perimeter fencing CAN be made to work.
You usually see it at maximum security facilities, where it's 
deployed between two high fences, which minimize the effects of most 
of the conditions I mentioned, and provide mechanical backup when the 
microwave is not able to cope.



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