Control of sub-pulse duration in noise-like structures

For the first time demonstrated are possibilities of control over the duration of sub-pulses within nanosecond noise-like pulse bunches, from 1.4 ps to 170 fs, through spectral filtering of radiation. The proposed method is implemented on the basis of an actively mode-locked Yb fibre laser. Prospects of electronic control over sub-pulse duration are analysed and practical applications are further discussed, in which sub-pulse duration may be important.