Abstract
An ytterbium-doped stretched-pulse mode-locked fiber oscillator was fabricated by applying a nonlinear amplifier loop mirror (NALM). The fiber cavity was built using a large-mode area (LMA) polarization-maintaining (PM) double-cladding (DC) fiber. The central wavelength of the generated 24.7 MHz laser can be modified from 1034 to 1104 nm by tuning the intra-cavity loss. The output power of this laser with a wavelength of 1104 nm at the transmission and reflection ports is 7.61 and 0.33 mW, respectively. The corresponding compressed pulse durations are 192 and 187 fs, which are 1.54 and 1.02 times the Fourier-transform-limited pulse duration, respectively.
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