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

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

2009-10-20

arxiv.org/abs/0910.3785v1

Applied Physics Letters 96, 021102 (2010)

Physics

Optics

4 pages, 3 figures, letter

Scientific paper

10.1063/1.3291105

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 non-thermal photo-induced phase transition. As a proof, we use a VO2 multi-film, undergoing an ultrafast insulator-to-metal phase transition when excited by femtosecond near-infrared laser pulses. The abrupt variation of the multi-film 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 new pump-probe experiments with frequency resolution over a broad spectral range (700-1100 nm).

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