>> Laser diodes transmit a VERY narrow band of
> frequencies.

> If it is a genuine laser, it's transmitting a *single*
> frequency, I believe!  :-)

What makes a LASER a LASER is not directly related to how many
frequencies it works on at once. LASERs can emit at a range of
frequencies and some do. Any given frequency band will usually be 
narrow and stable. It is generally desirable that operation be
at a single frequency and even when more than one is present one
wavelength will usually predominate.



        RM

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