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Ultrafast insulator-to-metal phase transition as a switch to measure the spectrogram of a supercontinuum light pulse

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Citation

Cilento, F., Giannetti, C., Ferrini, G., Dal Conte, S., Sala, T., Coslovich, G., et al. (2010). Ultrafast insulator-to-metal phase transition as a switch to measure the spectrogram of a supercontinuum light pulse. Applied Physics Letters, 96(2): 021102. doi:10.1063/1.3291105.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-1A36-5
Abstract
In this letter we demonstrate the possibility to determine the temporal and spectral structure (spectrogram) of a complex light pulse exploiting the ultrafast switching character of a nonthermal photoinduced phase transition. As a proof, we use a VO2 multifilm, undergoing an ultrafast insulator-to-metal phase transition when excited by femtosecond near-infrared laser pulses. The abrupt variation in the multifilm optical properties, over a broad infrared/visible frequency range, is exploited to determine, in situ and in a simple way, the spectrogram of a supercontinuum pulse produced by a photonic crystal fiber. The determination of the structure of the pulse is mandatory to develop pump-probe experiments with frequency resolution over a broad spectral range (700–1100 nm).