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

Cilento, Federico; Giannetti, Claudio; Ferrini, Gabriele; Dal Conte, Stefano; Sala, Tommaso; Coslovich, Giacomo; Rini, Matteo; Cavalleri, Andrea; Parmigiani, Fulvio

doi:10.1063/1.3291105

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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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http://dx.doi.org/10.1063/1.3291105
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引用

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

引用: https://hdl.handle.net/11858/00-001M-0000-0028-1A36-5

要旨

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).