Abstract
We experimentally investigate the generation of high-order modes (HOMs) at the wavelength band of 1.95 µm from a passively mode-locked, ultrashort pulse, Tm/Ho-co-doped fiber laser based on a mode-selective coupler (MSC). The mode-locked fiber laser outputs dissipative soliton pulses operating at wavelength of 1932.1 nm with spectrum width of 10.4 nm and pulse duration of 1.84 ps with repetition rate of 15.4 MHz. To the best of our knowledge, this is the first report on the generation of cylindrical vector beams (CVBs) from mode-locked fiber laser in the mid-infrared wavelength band that features all-fiber configuration, ultrashort pulse, and high-purity CVB generation.
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