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).

Cilento, F., Giannetti, C., Ferrini, G., Dal Conte, S., Sala, T., Coslovich, G., Rini, M., Cavalleri, A., Parmigiani, F., Ultrafast insulator-to-metal phase transition as a switch to measure the spectrogram of a supercontinuum light pulse, <<APPLIED PHYSICS LETTERS>>, 2010; 96 (Gennaio): N/A-N/A. [doi:10.1063/1.3291105] [http://hdl.handle.net/10807/6507]

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;Parmigiani, Fulvio
2010

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).
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http://apl.aip.org/resource/1/applab/v96/i2/p021102_s1?isAuthorized=no
Cilento, F., Giannetti, C., Ferrini, G., Dal Conte, S., Sala, T., Coslovich, G., Rini, M., Cavalleri, A., Parmigiani, F., Ultrafast insulator-to-metal phase transition as a switch to measure the spectrogram of a supercontinuum light pulse, <>, 2010; 96 (Gennaio): N/A-N/A. [doi:10.1063/1.3291105] [http://hdl.handle.net/10807/6507]
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