angular momentum raising lowering ladder operators

hello,

are there any angular momentum operators for, say, a hydrogen atom,
that raise and lower the angular quantum number l (ell) up and down,
as opposed to the Lx + iLy type operators that move the magnetic
quantum number m, "sideways" as it were but leave l unchanged?
so what i guess i'm asking is there some kind of differential
equation that generates the l+1'th spherical harmonic from the l'th,
or, or, something!

.

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