Dvoretskiy, Dmitriy A.Sazonkin, Stanislav G.Orekhov, Ilya O.Kudelin, Igor S.Denisov, Lev K.Karasik, Valeriy E.Agafonov, Viatcheslav N.Khabashesku, Valery N.Davydov, Valeriy A.2022-12-132022-12-132022Dvoretskiy, Dmitriy A., Sazonkin, Stanislav G., Orekhov, Ilya O., et al.. "Femtosecond Er-Doped All-Fiber Laser with High-Density Well-Aligned Carbon-Nanotube-Based Thin-Film Saturable Absorber." <i>Nanomaterials,</i> 12, no. 21 (2022) MDPI: https://doi.org/10.3390/nano12213864.https://hdl.handle.net/1911/114108We have studied the ultrafast saturation behavior of a high-density well-aligned single-walled carbon nanotubes saturable absorber (HDWA-SWCNT SA), obtained by a high-pressure and high-temperature treatment of commercially available single-wall carbon nanotubes (SWCNTs) and related it to femtosecond erbium-doped fiber laser performance. We have observed the polarization dependence of a nonlinear optical saturation, along with a low saturation energy level of <1 fJ, limited to the detector threshold used, and the ultrafast response time of <250 fs, while the modulation depth was approximately 12%. We have obtained the generation of ultrashort stretched pulses with a low mode-locking launching threshold of ~100 mW and an average output power of 12.5 mW in an erbium-doped ring laser with the hybrid mode-locking of a VDVA-SWNT SA in combination with the effects of nonlinear polarization evolution. Dechirped pulses with a duration of 180 fs were generated, with a repetition rate of about 42.22 MHz. The average output power standard deviation was about 0.06% RMS during 3 h of measurement.engThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).Journal articlenanomaterials-12-03864https://doi.org/10.3390/nano12213864