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Interaction schemes of the propagating light and nanotube layers. (a) Direct interaction and (b) evanescent field interaction.
SEM photos of the SWNT-based all-fiber mode locking device. (a) Cross section of the mode locker. The VA-SWNT film is transferred onto the flat surface of the D-shaped fiber. (b) Magnified photo of the circled area in (a). Individual VA-SWNTs without any significant distortion or defect after the transfer are verified.
Structure of our mode-locked laser.
(a) Optical spectrum of the laser output and (b) output pulse train. The spectral FWHM is and the repetition rate is . (c) Autocorrelation trace of the pulse. The inferred temporal pulse width is .
Long-term operation of the pulsed laser. The fluctuation of the FWHM is negligible. Average power is also not degraded showing the negligible fluctuation of .
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