Fig. 3: The χ(3) spectrum for hydrogenic donors Si:P and Ge:P, with light polarized along a valley axis in each case, and hydrogen (all calculations from this work). | Light: Science & Applications

Fig. 3: The χ(3) spectrum for hydrogenic donors Si:P and Ge:P, with light polarized along a valley axis in each case, and hydrogen (all calculations from this work).

From: Giant non-linear susceptibility of hydrogenic donors in silicon and germanium

Fig. 3

A hydrogenic atomic vapor (Rb) is shown for comparison (data from ref. 6). Labels indicate the excited state for 3ω = ωeg resonances and one 2ω resonance. The top axis applies only to Si:P and indicates the frequency in THz

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