Erratum to: Femtosecond Laser Assisted Hatching: Dependence of Zona Pellucida Drilling Efficiency and Embryo Development on Laser Wavelength and Pulse Energy

A mistake was found in determining the energy of laser pulses.

Since direct measurement of laser pulse energy in the range of several tens of nanojoules is difficult due to the lack of technical means, the pulse energy E was determined by measuring the average laser radiation power P from E = P/f, where f was the pulse repetition rate. During the calibration, an incorrect frequency value was used (2.5 kHz instead of 5 kHz), which led to an overestimation of energy values by a factor of 2. The pulse energy values for both the fundamental radiation frequency E_w and the second harmonic E_2w, starting from p. 49, should be divided by 2. Tables 1 and 2 on p. 50 should read as follows:

Table 1.   Data on late blastocyst formation rate and hatching rate in control embryos and zona-drilled embryos treated with laser pulses at the wavelength of 514 nm

Table 2.   Data on late blastocyst formation rate and hatching rate in control embryos and zona-drilled embryos treated with laser pulses at the wavelength of 1028 nm

The mistake was discovered when carrying out the experiments on the project supported by the Russian Science Foundation no. 23-19-00424, https://rscf.ru/project/23-19-00424/.