No abstract

As intense, ultrashort, kHz-repetition-rate laser systems become commercially available, pulse cumulative effects are critical for laser filament based applications. In this work, the pulse repetition rate effect on the femtosecond laser filamentation in air was investigated both numerically and experimentally. The pulse repetition rate effect has negligible influence at the leading edge of filament. Clear intensity enhancement from high repetition pulse is observed at the peak and tailing edge of laser filament. As the repetition rate of the laser pulses increasing from 100Hz to 1000Hz, the length of filament extends and the intensity inside the filament increases. A physical picture based on the pulse repetition