Ultrafast saturable absorption of large-diameter single-walled carbon nanotubes for passive mode locking in the mid-infrared
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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10
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Optics Express, Volume 28, issue 14, pp. 19997-20006
Abstract
We study the saturable absorption properties of single-walled carbon nanotubes (SWCNTs) with a large diameter of 2.2 nm and the corresponding exciton resonance at a wavelength of 2.4 µm. At resonant excitation, a large modulation depth of approximately 30 % and a small saturation fluence of a few tens of µJ/cm2 are evaluated. The temporal response is characterized by an instantaneous rise and a subpicosecond recovery. We also utilize the SWCNTs to realize sub-50 fs, self-start mode locking in a Cr:ZnS laser, revealing that the film thickness is an important parameter that affects the possible pulse energy and duration. The results prove that semiconductor SWCNTs with tailored diameters exceeding 2 nm are useful for passive mode locking in the mid-infrared range.Description
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Okazaki, D, Morichika, I, Arai, H, Kauppinen, E, Zhang, Q, Anisimov, A, Varjos, I, Chiashi, S, Maruyama, S & Ashihara, S 2020, 'Ultrafast saturable absorption of large-diameter single-walled carbon nanotubes for passive mode locking in the mid-infrared', Optics Express, vol. 28, no. 14, pp. 19997-20006. https://doi.org/10.1364/OE.395962