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This erratum presents a correction to the computed reflection spectra of transient fiber Bragg gratings that are spontaneously built-up in the ytterbium-doped fiber of the fiber laser with laser wavelength self-sweeping. The corrected spectra have high reflectivity reaching values up to 100%. Therefore, they still more support the conclusion drawn in the original paper that self-sweeping is an important mechanism for triggering the self-Q-switched regime with giant pulse generation.
© 2016 Optical Society of America
In Figs. 6 and 7 on page 30029 of Ref [1], we showed reflection spectra of fiber Bragg gratings (FBGs) that were incorrectly calculated using a computer code where slow apodization was applied by mistake. This apodization was mistakenly left in the computer code after previous testing and verification of the code for the calculation of FBG reflection spectra. Corrected Figs. 6 and 7 are shown in this erratum. Note that the spectra in these figures even have higher reflectivity (up to 100%) and are more symmetrical than the spectra shown in [1]. Therefore, the corrected spectra still more support the qualitative conclusion drawn in the original paper that self-sweeping is an important mechanism for triggering the self-Q-switched regime with generation of giant pulses.
Fig. 6 (a) Reflectivity of the dynamic FBG for three different levels of metastable level excitations. (b) Detail of the reflectivity in close proximity of the immediate laser wavelength.
Fig. 7 Reflectivity of short sections around the peak refractive index modulation. The section length is 40 cm (a) and 10 cm (b). Maximum metastable level excitation was assumed.
Acknowledgments
The authors gratefully acknowledge a fruitful discussion with Jiří Čtyroký about the FBG modeling and Andrei Fotiadi about the self-Q-switching regime and associated transient FBGs. The research was supported by the Czech Science Foundation under project 16-13306S.
References and links
1. P. Peterka, P. Honzátko, P. Koška, F. Todorov, J. Aubrecht, O. Podrazký, and I. Kašík, “Reflectivity of transient Bragg reflection gratings in fiber laser with laser-wavelength self-sweeping,” Opt. Express 22(24), 30024–30031 (2014). [CrossRef] [PubMed]
