Kaiser–Bessel window function; KaiserWindow[x] or KaiserWindow[x alpha] (default alpha 3)
KaiserWindow[x]
KaiserWindow[x, α]
Plot[KaiserWindow[x], {x, -1, 1}, Exclusions -> None]
→ -Graphics-Plot3D[KaiserWindow[x]KaiserWindow[y], {x, -1, 1}, {y, -1, 1}, PlotRange -> All, Exclusions -> None]
→ -Graphics3D-KaiserWindow[0.1]
→ 0.9522218569243645