We have proposed an advanced technique to measure the Nb-93m yield precisely by Resonance Ionization Mass Spectrometry, instead of conventional characteristic X-ray spectroscopy. Nb-93m-selective resonance ionization is achievable by distinguishing the hyperfine splitting of the atomic energy levels between Nb-93 and (93)mNb at high resolution. In advance of (93)mNb detection, we could successfully demonstrate high resolution resonant ionization spectroscopy of stable Nb-93 using an all solid-state, narrow-band and tunable Ti: Sapphire laser system operated at 1 kHz repetition rate.