On Mon, 01 Apr 2013 09:08:51 +1300
Bruce Griffiths <[email protected]> wrote:

> Nothing to do with laser line width.
> Merely indicating that the photodiode mixer can be used with a suitable 
> LO to build an optical spectrum analyser front end.

Are you refering to heterodyne spectrum analyser?

                        Attila Kinali
-- 
The people on 4chan are like brilliant psychologists
who also happen to be insane and gross.
                -- unknown
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