Fig. 3.

(A) For fixed ${\delta }_{\text{eff}}=-2\pi \times 17.5$ kHz the intracavity intensity is plotted with the pump strength ramped from 0 to $4E_{\text{rec}}$ in 1.5 ms (blue line) and back (red line). Below A, a series of consecutively numbered momentum spectra is shown (1–5), recorded at increasing times during the ${\epsilon }_p$-ramp, indicated by the correspondingly numbered arrows in A. (B) Mean-field calculation according to A for a homogeneous, infinite system without collisional interaction. (C) Mean-field calculations of ${\epsilon }_{p,1}$ (Lower, red dots) and ${\epsilon }_{p,2}$ (Upper, blue dots) are shown. The solid lines show power laws with exponents $n_1=-0.57$ (Lower) and $n_2=-0.85$ (Upper). The measured dependence of the critical values ${\epsilon }_{p,\mu },\mu \in \left\{\mathrm{1,2}\right\}$ upon the quench time ${\tau }_Q$ is shown for $\mu =2$ in D and for $\mu =1$ in E. The solid lines repeat the power laws found in the mean-field calculations in C. The error bars reflect the SDs for 10 measurements.