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The team has already demonstrated modelocked sub-picosecond operation of Yb -, Er - and Tm: Ho-doped fibre lasers emitting at 1.05, 1.56 and 1.99 microns, respectively, using the same CNT-based absorber.— optics.org all content
Immediately thereafter, both ions are excited by a picosecond (one trillionth of a second) laser pulse.— RichardDawkins.net : The Latest Updates
However, a direct experimental measurement of this ultrafast (picosecond) H-bond exchange has been lacking.— Proceedings of the National Academy of Sciences current issue

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