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

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

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

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).
Original languageEnglish
Pages (from-to)N/A-N/A
Number of pages21102
JournalApplied Physics Letters
Volume96
DOIs
Publication statusPublished - 2010

Keywords

  • optical switch
  • supercontinuum
  • vanadium dioxide

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