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We report measurements of stimulated emission in poly(9,9-dioctylfluorene). We find a gain coefficient of 1.2×104 cm−1 for 100 nm-thick films at an excitation energy density of 9.9 mJ/cm2. Using ultrafast pump–probe measurements, we have studied the effect of cavity optical confinement. A strong shift of the cavity resonance due to nonlinear refraction is observed.
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Virgili et al. (1999) studied this question.
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