15 May 2014 Near-field and complex-field time-stretch transform
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The time-stretch dispersive Fourier transform enables high-throughput acquisition of optical spectra in single-shot measurements by performing an analog Fourier transform and stretching the signal to facilitate capture with high-speed electronics. The coherent time-stretch transform adds complex-field detection so that spectral amplitude and phase can be measured in the temporal near field, i.e., without a strict dispersion requirement. Full-field spectra are recovered via temporal interferometry on waveforms dispersed in the temporal near field. Real-time absorption spectra including both amplitude and phase information are acquired at 37 MHz.
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Peter T. S. DeVore, Brandon W. Buckley, Mohammad H. Asghari, Daniel R. Solli, Bahram Jalali, "Near-field and complex-field time-stretch transform", Proc. SPIE 9141, Optical Sensing and Detection III, 91411P (15 May 2014); doi: 10.1117/12.2050979; https://doi.org/10.1117/12.2050979

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