Based on hybrid wavelength pumping and tapered Yb-doped fibers (T-YDFs), a 650 W all-fiber single-frequency polarization-maintaining fiber amplifier was demonstrated experimentally at 1030 nm. Different pump power ratios in the T-YDF-based power-amplifier stage were proposed to investigate their influence on the transverse mode instability (TMI) effect. The highest TMI threshold was obtained when the pump power ratio of 940 nm to 976 nm was 1:4.4. A measured M2 factor of 1.7 and a polarization extinction ratio of 14 dB at the maximum output power were obtained. To the best of our knowledge, these results exhibit the highest output power of any all-fiber single-frequency polarization-maintaining fiber amplifiers created up to now.
Based on a fiber Fabry-Pérot tunable filter (FFP-TF) and a 3.0-m-long unpumped gain fiber for forming dynamic grating, a in-band pumped tunable Tm3+-doped single-frequency fiber laser (T-TSFFL) covering a wavelength tuning range from 1857.01 to 2020.17 nm and a tuning interval of < 0.43 nm is demonstrated experimentally. Additionally, the laser linewidths of < 500 Hz and the relative intensity noises of ˂ -145 dB/Hz at frequencies over 1 MHz are obtained. To date, it is the broadest wavelength tuning range that has been reported in the 2 μm region, which is highly competitive in atmospheric detection.
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