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. 2022 Jun 3;8(22):eabn7192. doi: 10.1126/sciadv.abn7192

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Fig. 3. — The contrast by stimulated emission is exceeding the PL contrast for low external seeding, i.e., a high contribution of the stimulated emission to the detection signal. The contrast is calculated by the relative difference of the stimulated emission rates C = 1 − Γ_st(B ≠ 0)/Γ_st(B = 0). A detailed calculation can be found in section S8.