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Abstract
An erratum is presented to correct the laser pulse energy applied on the fiber during grating fabrication in Opt. Lett. 47(2), 249 (2022) [CrossRef] .
© 2022 Optica Publishing Group
Errors concerning the laser pulse energies applied on the fiber during the grating fabrication process were found in [1]. The correct energies should be:
In the abstract, “The highest reflectivity of approximately 99% is obtained with a pulse energy of 11.2 nJ, showing a large refractive index modulation amplitude of 7.2 × 10−4.”
In the text, “It was found that the grating reflectivity increased as a function of E, and the highest reflectivity of 98.8% appeared for FBG 3 with 11.2 nJ.”
In the text, “Furthermore, for the highest pulse energy, 11.6 nJ, the nefff and $\Delta$nefff of FBG 4 were 1.50919 and 3.3 × 10−4, respectively, which were smaller than their counterparts for FBG3.”
The corrected Table 1 is shown here as well.
Table 1. Data for FBGs Inscribed by the Femtosecond Laser at 520 nm
The authors state that the conclusions of the paper are not affected by the corrections.
Funding
2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant (2020LKSFG01B, 2020LKSFG14B); Specialized Project Fund in Science and Technology of Guangdong Province (2019ST096, 2019ST135); Special projects in key fields of colleges and universities in Guangdong Province (2020ZDZX3035, 2020ZDZX3037); The Start-up fund from Shantou University (NTF18016, NTF19023); National Natural Science Foundation of China (62003046); International Science and Technology Cooperation Programme (BZ2019063, BZ2020030, BZ2020045).
Acknowledgment
C. Caucheteur is supported by the F.R.S.-FNRS.
Disclosures
The authors declare that there are no conflicts of interest related to this article.
REFERENCES
1. X. Hu, Z. Chen, X. Cheng, R. Min, H. Qu, C. Caucheteur, and H.-Y. Tam, Opt. Lett. 47, 249 (2022). [CrossRef]