Optimization of a femtosecond pulse self-compression region along a filament in air

Single-cycle pulse generation in the course of four-wave mixing in the filament

“…2). This results are in a good agreement with experiments [24] and simulation [29] of self-compression in femtosecond filament. According to the stationary theory (1, 7) signal pulse wavelength λ2 is equal to 8.4 μm (λ1 = 420 nm), 3.6 μm (λ1 = 450 nm) и 2.4 μm (λ1 = 480 nm).…”

Filamentation of high-power femtosecond laser radiation

“…This conclusion is conérmed in paper [187], where the pulse duration after élamentation in a VK7 glass decreased from 50 to 20 fs. The authors of [188] determined the region of a élament for collimated radiation in air where the maximum compression of a pulsed was achieved. It was shown that the duration of a 805-nm, 55-fs, 4-mJ pulse under these conditions decreased to 9 fs.…”

Temporal autolocalization of femtosecond light pulses in the filaments observed in fused silica

“…Considerable success has recently been achieved in self-compression of femtosecond laser pulses in gases. It has been shown both experimentally and theoretically [2][3][4][5][6] that the initial several-tensof-femtoseconds-long pulses can be compressed down to almost one oscillation cycle. Using such extremely compressed IR pulses, attosecond pulses in the UV can be obtained in the process of high-order harmonic generation [7,8].…”