Measurement of oscillator strength of ytterbium atom by single-mode pulsed laser

Summary form only given. It has been known that relaxations of a level damp a Rabi oscillation as a function of time and fluence of pumping laser. In this work we demonstrate that the phase diffusion of a single-mode laser also damps the Rabi oscillation as a function of fluence. The modulation depth and period of Rabi oscillation are affected by the phase diffusion so that it should be considered for more accurate measurement of a oscillator strength. As the Autler-Townes splitting is also stems from the Rabi oscillation, both the splitting and the dip are affected from phase diffusion.