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Schematic explanation of (a) the operation principle, and (b) the experimental setup of the electrospray scheme. In (b), the spray angle is 30°, and D is the nozzle-substrate distance.
(a) Prepared side-polished fiber deposited with CNTs onto a flat surface resulting in evanescent field interaction of the traveling mode with CNTs. (b) SEM image to evaluate the nanomorphology of the electrosprayed CNT layer.
Structure of a passively pulsed fiber ring laser mode-locked by a nonlinear photonic device incorporating electrosprayed CNTs.
(a) Optical spectrum of the pulsed laser output, and (b) its pulse train. The spectral width and the repetition rate are 13.87 nm and 3.95 MHz, respectively. The estimated temporal pulse duration is 190.9 fs.
(a) The correlation of spectral characteristics with pump power. The spectrum becomes sharper as the pump power is increased. (b) Estimated pulse peak powers in the time domain that are inversely proportional to the pump power. (b) also shows the stability of the center wavelength with respect to the pump power tuning.
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