Correction

In the Commentary entitled “Nanotube and graphene saturable absorbers for fibre lasers” (Nature Photon. 7, 842–845; 2013), “electrical gating²⁴” on page 844 should have been “electrical gating²⁵”, “compressed externally^19,34” on page 845 should have been “compressed externally^13,34” and “23. Davide Di Dio Cafiso, S. Opt. Lett. 38, 1745–1747 (2013)” in the reference section should have been “23. Davide Di Dio Cafiso, S. et al. Opt. Lett. 38, 1745–1747 2013)”. These errors have been corrected in both the HTML and PDF versions.