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Lett."],"published-print":{"date-parts":[[2026,7,1]]},"abstract":"<jats:p>We report the first, to the best of our knowledge, 100\u2009MHz stretched-pulse mode-locked (SPML) wavelength-swept laser light source and optical coherence tomography (OCT) system. The all-polarization-maintaining fiber SPML laser employs a chirped fiber Bragg grating (CFBG) with a linear-in-wavenumber intra-cavity group delay of 93 ps\/nm over the 1240\u2009\u2212\u20091340\u2009nm wavelength range, enabling a 100\u2009nm wavelength sweep within 9.3\u2009ns. The resulting OCT system operates at a 100\u2009MHz A-line rate with a measured axial resolution of 13.5\u2009\u00b5m, 90\u2009dB sensitivity, and a 6\u2009dB coherence length of 500\u2009\u00b5m. To fully exploit this ultrahigh A-line rate for practical applications, a polygon-mirror-based fast-axis beam scanner is combined with a calibration-based framework that compensates polygon-scanner-induced image artifacts. 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