Figure 1

One-color PA of two ground-state ${}^{88}\mathrm{Sr}$ atoms in a BEC to the second least bound state ($n=-2$) of the excited molecular potential. The shaded band indicates the continuum of scattering states important for the dynamics of Eq. (1).Reuse & Permissions

Figure 2

ac Stark shift due to PA light for long exposure times compared to the time scale for transient effects. Exposure times and intensities of the PA laser are given in the legend. A fit to the line centers (inset) yields $(-275\pm 30)\mathrm{kHz}/(\mathrm{W}/{\mathrm{cm}}^2)$. Zero detuning is the line center at low intensity.Reuse & Permissions

Figure 3

Spectra of the number of atoms remaining in BEC for $2.4\mathrm{W}/{\mathrm{cm}}^2$ excitation intensity and various excitation times. Zero frequency detuning is the PA resonance position at vanishing PA laser intensity but including the ac Stark shift due to the trapping laser. Lines are predictions of Eqs. (1) for ${\ell }_{\mathrm{opt}}/I=5000a_0/(\mathrm{W}/{\mathrm{cm}}^2)$, showing the transient shift and oscillatory behavior for blue detuning. The inset shows the center frequency versus time, found by fitting Gaussians to the spectra, and the solid line is an exponential fit to the trend.Reuse & Permissions

Figure 4

Number of BEC atoms versus time. The number is scaled to the number with no PA (downward triangle, 8800; circle, 8800; square, 6700) and time is scaled to the inverse Rabi frequency for average density $\overline{n}=n_{\mathrm{peak}}/\sqrt{8}$, $2\pi /{\overline{\Omega }}_R=(\mathrm{\text{downward triangle}},7.1;\mathrm{\text{circle}},7.1;\mathrm{\text{square}},10.5)\mu \mathrm{s}$. The legend states the detuning with respect to PA resonance at low intensity and (in parentheses) the detuning with respect to the long-time resonance position including ac Stark shift, followed by the intensity. Rabi oscillations are clearest for large blue detuning from the ac-Stark-shifted resonance (downward triangle). Solid lines are predictions of Eqs. (1) for ${\ell }_{\mathrm{opt}}/I=5000a_0/(\mathrm{W}/{\mathrm{cm}}^2)$ and peak density at the upper limit of the measurement uncertainty. The universal prediction (dash-dotted line) is given by Eq. (9) in Ref. 8. The inset shows the calculated population of atoms in the excited-state molecular BEC and ground-state atoms in noncondensate modes.Reuse & Permissions