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. 2019 Sep 4;10:3985. doi: 10.1038/s41467-019-11898-z

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Ultrafast laser pulse generation using biologically synthesized tellurium. a Scheme of the erbium-doped fiber laser with a Bio-Te-saturable absorber. b Mode-locked pulse train generated by the erbium fiber laser with repetition rate of 18.8 MHz. c Auto-correlation measurement of Bio-Te mode-locked laser pulses. The sech² fitting indicates a 1.81 ps pulse width. The inset shows the spectrum of the mode-locked pulses. d Q-switched pulse train generated in the EDF fiber laser. e Diagram of the Tm: YAP 2 μm laser with Bio-Te saturable absorber mirror acting as a passive optical modulator. f Mode-locked pulses generated in the same Tm: YAP laser with the a ~112.3 MHz repetition rate and 1.6 ns pulse duration