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, Peter T. S. DeVore, Brandon W. Buckley, Brandon W. Buckley, Mohammad H. Asghari, Mohammad H. Asghari, Daniel R. Solli, Daniel R. Solli, Bahram Jalali, 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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