[Laser] Re: street light EME

[F1AVYopto at aol.com]

>I am assuming two things:  First, that your 24 cm mirror is,  or is of
>quality similar to, a telescope for amateur astronomy.   Second, that you
>want to narrow the effective field of view of the  instrument.  Increasing
>the focal length of the telescope, perhaps  with a Barlow lens seems to be
>what you need to do.
 
James
It is possible for this experiment a high optical gain is not useful  because 
the moon light background / useful signal ratio is probably rather  constant 
versus the telescope diameter.
The sensitivity improvement is mainly  a bandwidth question.
Sodium spectrum lines allow a very selective optical  device.  
As write Art KY1K, a simple photomultiplier without optic  could be 
sufficient to detect the signal during a total moon eclipse.
Thank  you for all your very constructive ideas and comments.
Yves F1AVY