Abstract

Photonic time-stretch applications overcome the speed limitations of conventional digitizers and enable the observation of nonrepetitive and statistically rare phenomena that occur on short timescales. In most time-stretch applications, large temporal dispersion with large bandwidth is highly desired to satisfy the far-field diffraction regime. However, most conventional spatial dispersers or chirped fiber Bragg gratings are constrained by their spatial volume, which can be overcome by using ultra-low-loss dispersive fibers, an ideal medium for large temporal dispersion (β₂), but they suffer from third-order dispersion (β₃) and aberrations. In this paper, an optical phase conjugation-based, third-order dispersion compensation scheme was introduced, with accumulated β₂ and eliminated β₃, and it achieved a ±3400-ps² pure temporal dispersion of over 30-nm bandwidth. Leveraging this pure temporal dispersion, up to 2% of temporal aberrations were eliminated. Furthermore, Fourier domain spectroscopy achieved a record 15000 optical effective resolvable points, with a nondegraded 2-pm resolution over a 30-nm range.

Temporally structured illumination for ultrafast time-stretch microscopy

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Time-division-multiplexed observation bandwidth for ultrafast parametric spectro-temporal analyzer

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Ultrafast time-stretch microscopy based on dual-comb asynchronous optical sampling

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Fast and high-resolution spectroscopy based on asynchronous optical sampling

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Calibration-free time-stretch optical coherence tomography with large imaging depth

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