Enhanced electron–positron pair production by frequency chirping in one- and two-color laser pulse fields

Abdukerim Nuriman^{1, 2}, Li Zi-Liang^{1, 3}, Xie Bai-Song^{1, 4, †}

(color online) Electron–positron number density versus the ratio of magnitude of frequency chirp to the original frequency, where , in two-color pulse laser field .