用绝缘体-金属超快相变开关测量超连续谱光脉冲谱
Ultrafast insulator-to-metal phase transition as a switch to measure the spectrogram of a supercontinuum light pulse
摘要：
在这封信中，我们证明了利用非热光致相变的超快开关特性来确定复杂光脉冲的时间和光谱结构（光谱图）的可能性。作为证明，我们使用的VO 2多膜，经历一个超快的绝缘体到金属相变时，激发飞秒近红外激光脉冲。多膜光学特性的突变，在一个广泛的红外/可见光频率范围内，被利用来确定，在现场和以一种简单的方式，由光子晶体光纤产生的超连续谱脉冲的光谱图。脉冲结构的确定对于开发具有宽光谱范围（700-1100 nm）的频率分辨率的新的泵浦-探测实验是强制性的。
英文摘要：
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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