Jinc Function
The jinc function is defined as
where
is a Bessel Function of the First Kind, and satisfies 
. TheDerivative of the jinc function is given by
The function is sometimes normalized by multiplying by a factor of 2 so that
(Siegman 1986, p. 729).See also Bessel Function of the First Kind, Sinc Function
References
Siegman, A. E. Lasers. Sausalito, CA: University Science Books, 1986.
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