2009/10/20 by Federico Cilento, Claudio Giannetti, Gabriele Ferrini +8
Engineering · Materials Science · Physics and Astronomy · #Advanced Fiber Laser Technologies #Advanced Fiber Optic Sensors #Transition Metal Oxide Nanomaterials #physics.optics
paper · pdf · doi:10.1063/1.3291105
published as Applied Physics Letters 96, 021102 (2010) · 4 pages, 3 figures, letter
arxiv created 2009/10/20 · openalex publication_date 2010/01/11 · arxiv updated 2011/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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).