Figure 3: The switching process.

Spectrum obtained from the drain as a function of the energy at the source. The fluence at the source wedge is 0.04 nJ μm⁻² in a; 0.18 nJ μm⁻² in b and 0.23 nJ μm⁻² in c. Panel d shows the intensity measured at D for the drain frequency (589.3 nm, triangles) and for the source frequency (593.2 nm, circles) as a function of the fluence at S. Data corresponding to the top panels are indicated.