In this erratum the formulas (6) and (8) of Opt. Lett. 44, 139 (2019) [CrossRef] have
© 2019 Optical Society of
In the third page of , the formulas
(6) and (8) should have been changed to:
1. X.-B. An, H. Zhang, C.-M. Zhang, W. Chen, S. Wang, Z.-Q. Yin, Q. Wang, D.-Y. He, P.-L. Hao, S.-F. Liu, X.-Y. Zhou, G.-C. Guo, and Z.-F. Han, Opt. Lett. 44, 139 (2019). [CrossRef]
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