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. 2017 Mar 10;6(3):e16239. doi: 10.1038/lsa.2016.239

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Copyright © 2017 The Author(s)

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Schematic of the experiment. Laser pulses from a broadband femtosecond laser induce two-photon absorption in rod-shaped CdSe/CdS quantum dots, after passing through a phase-only pulse shaper. TPPL signal collected using an oil-immersion objective is spectrally filtered and sent to a single photon avalanche photodiode (APD). For each optimization step, the multiple one-dimensional search optimization algorithm searches for the spectral phase on the spatial light modulator pixels that maximizes the TPPL signal using it as feedback variable.