We demonstrate quasi-supercontinuum (quasi-SC) generation around the wavelength region using ultrahigh-speed, wavelength-tunable, femtosecond soliton pulses based on an ultrashort-pulse laser system operating at a wavelength of . The wavelength tuning range was from 1.0 to , and the scanning speed was up to . A Gaussian-like quasi-SC with a bandwidth of was generated at . The generated quasi-SC was used in an optical-coherence tomography system. High axial resolutions of in air and in tissue were obtained. A maximum sensitivity of was achieved, and ultrahigh-resolution images of a hamster cheek pouch were observed.
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