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Single‐walled carbon‐nanotube absorbers are experimentally demonstrated for laser mode‐locking. A saturable absorber device is used to mode‐lock three different bulk solid‐state lasers in a 500 nm‐wide wavelength interval. The devices exhibit a low saturation fluence of <10 µJ cm−2, low scattering losses, and an exceptionally rapid relaxation, with time constants reaching <100 fs. The latter...
The image shows an artist's view of the broadband light matter interaction in single‐walled carbon nanotubes. Brought in close proximity, tubes may interact with each other, which may be beneficially exploited for an accelerated relaxation mechanism of the excited carriers and enable ultrafast broadband laser mode‐locking as demonstrated by F. Rotermund et al. on page 1937.
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