Figure 1

Experimental (symbols) and calculated (lines) survival probabilities versus the time of application of a 6 ns, $100\mathrm{mV}{\mathrm{cm}}^{-1}$ probe pulse after turn-off of an 85 ns, $5\mathrm{mV}{\mathrm{cm}}^{-1}$ pump pulse. (a) Results with no drive field present, (b),(c) results with $2.5\mathrm{mV}{\mathrm{cm}}^{-1}$, 230 MHz sinusoidal drive field initiated at $t_L\sim 39\mathrm{ns}$. The pump, drive, and probe fields are all applied along the $y$ axis. The inset shows the pulse sequence applied to the parent quasi-1D atoms.Reuse & Permissions

Figure 2

Poincaré surfaces of section for a Rydberg atom driven by a linearly polarized field $\overrightarrow{F}(t)\simeq \widehat{y}{F}_{\mathrm{drv}}\sin [\omega (t-t_L)]$ with $F_{\mathrm{drv}}=2.5\mathrm{mV}{\mathrm{cm}}^{-1}$ and values of $\omega$ of (a) 230 MHz and (b) 104 MHz. The surfaces of section ($r/n_i^2,\tilde{\varphi }$) in the rotated frame are obtained by cutting phase space at $L\simeq n$ and $L_y\simeq 0$. The stroboscopic snapshots are taken when $\overrightarrow{F}(t)$ reaches its maximum, i.e., at $\omega (t-t_L)=\pi /2$ (modulo $2\pi$). (c),(d) Initial and final spatial densities in the ($r/n_i^2,\tilde{\varphi }$) plane for a near-circular $n_i=305$ wave packet driven by a sinusoidal field with $F_{\mathrm{drv}}=2.5\mathrm{mV}{\mathrm{cm}}^{-1}$ chirped from 230 to 104 MHz over $1\mu \mathrm{s}$.Reuse & Permissions

Figure 3

Selective field ionization spectra showing ionization signals observed as a function of field applied along the $y$ axis. The spectra were obtained after driving by (black line) an unchirped sinusoidal drive field as in Fig. 1, (red dotted line) the same chirped drive field as for Fig. 2d, and (blue dashed line) the same drive field as for Fig. 4. The graphical insets show measured (symbols) and calculated (line) survival probabilities versus time of application of a 6-ns-long probe pulse sufficient to ionize, on average, $\sim 50\%$ of the atoms. The other insets show snapshots of the calculated spatial distributions in the $x_0{y}_0$ plane ($x_0,y_0=x,y/n_i^2$) for the conditions or times indicated (crosses).Reuse & Permissions

Figure 4

Evolution of (a) $⟨x(t)⟩,⟨y(t)⟩$, (b) $⟨p_x(t)⟩,⟨p_y(t)⟩$, (c) the energy distribution, and (d) the distribution of scaled transverse angular momentum for a near-circular $n_i\sim 305$ wave packet initially localized in the $xy$ plane and subject to a sinusoidal drive field whose frequency is chirped from 230 to 31 MHz over $1\mu \mathrm{s}$, while linearly decreasing its amplitude from 2.5 to $1.3\mathrm{mV}{\mathrm{cm}}^{-1}$. The spatial coordinates, momenta, and energy are scaled to $n_i$: $x_0,y_0=x,y/n_i^2$, $p_{x0},p_{y0}=n_i{p}_x,n_i{p}_y$, and $E_0=n_i^{2}E$. The angular momentum $L_{\perp }$ is scaled to the time dependent $n$.Reuse & Permissions