  In this work we model and realize stimulated Raman adiabatic passage (STIRAP)
in the diatomic $\mathrm{^{23}Na^{40}K}$ molecule from weakly bound Feshbach
molecules to the rovibronic ground state via the
$\left|v_d=5,J=\Omega=1\right\rangle$ excited state in the $d^3\Pi$ electronic
potential. We demonstrate how to set up a quantitative model for polar molecule
production by taking into account the rich internal structure of the molecules
and the coupling laser phase noise. We find excellent agreement between the
model predictions and the experiment, demonstrating the applicability of the
model in the search of an ideal STIRAP transfer path. In total we produce 5000
fermionic groundstate molecules. The typical phase-space density of the sample
is 0.03 and induced dipole moments of up to 0.54 Debye could be observed.
