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The two photon absorption spectrum has been measured in the 780–1600 nm range for a di-alkyl-amino-nitro-stilbene side-chain polymer. A single two photon peak centered at 920 nm is observed with a peak two photon coefficient of 5.5 cm/GW. Bleaching via two photon absorption at this wavelength is investigated by measuring a refractive index change after an intensive exposure.
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Cha et al. (1994) studied this question.
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