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We detect the coherence of localized surface plasmon resonances in individual silver nanoparticles via accurately delayed femtosecond laser pulses. The Fourier transform of the time-resolved spectra reveals nanoplasmonic coherence components and their corresponding dephasing rates.
We compare deviations from theory in the yield of second harmonic generation in order to characterize high-repetition rate femtosecond laser sources where the amplitude and phase differs from pulse to pulse. Experimental results are presented for cases with phase noise and a post-pulse.
We present pump-probe measurements that reveal significant changes in the group delay dispersion of a femtosecond laser pulse being controlled by the relative delay between two pulses. We suggest applications for this time-domain shaping approach.
A method capable of measuring single-laser-pulse dispersion is described. It relies on acquiring a single SHG spectrum for a fixed reference phase mask and allows studying transient phase changes in optical media.
A shaped femtosecond laser can selectively excite a coherence in a particular Raman mode. This concept is used to produce chemical images of an explosive simulant in a polymer background in a standoff configuration.
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