arXiv 0803.16542008-03-11physics.optics

Real-time Spectroscopy with Sub-GHz Resolution using Amplified Dispersive Fourier Transformation

J. Chou, D. R. Solli, B. Jalali

备注：: The following article has been accepted by Applied Physics Letters
DOI：: 10.1063/1.2896652

英文摘要：

Dispersive Fourier transformation is a powerful technique in which spectral information is mapped into the time domain using chromatic dispersion. It replaces a spectrometer with an electronic digitizer, and enables real-time spectroscopy. The fundamental problem in this technique is the trade-off between the detection sensitivity and spectral resolution, a limitation set by the digitizer's bandwidth. This predicament is caused by the power loss associated with optical dispersion. We overcome this limitation using Raman amplified spectrum-to-time transformation. An extraordinary loss-less -11.76 ns/nm dispersive device is used to demonstrate single-shot gas absorption spectroscopy with 950 MHz resolution--a record in real-time spectroscopy.

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