Abstract
The influence of prepared plasma induced by a prepulse on the THz emission generated by main two-color femtosecond lasers (fs-lasers) has been investigated numerically and analytically by using a photocurrent model. Results observed in a previous report, such as the suppression of THz emission from the main pulse due to the existence of a prepulse, were easily reproduced. Further calculation showed that such suppression originates from residual electrons of the prepared plasma affecting the main pulse. Moreover, an exact expression between the E-field of THz waves generated by the main pulse and the residual electron density of the prepared plasma has been obtained.
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