Abstract We present an erratum to our Letter [Opt. Lett. 41, 230 (2016) [CrossRef] ]. This erratum corrects three typing errors. The corrections have no influence on the results and conclusions of the original Letter. © 2022 Optica Publishing Group We recently noticed three typing errors in [1]: 1. In Eq. (9), the “=” should be “${\propto}$”: (9)$$I(r) \propto {|{{E_\textrm{0}}({\mathbf r},t)} |^2} = a_0^2\frac{{w_0^2}}{{w{{(z)}^2}}}\exp \left[ { - \frac{{2{r^2}}}{{w{{(z)}^2}}}} \right]f(\eta ).$$ 2.
