Laser-plasma based particle accelerators are a source of particles and radiation, spanning a wide range of output parameters (e.g. species, time duration, transverse phase space, etc.). One of the key features of interest is the extremely short time duration of such beams, well below the range of the electronic detection realm. It is necessary to access diagnostics methods able to circumvent such issues. Inherited from conventional particle accelerators, charged beams time duration measurements through radiation emitted by bunch are a flexible and robust method. The emitted radiation can be analysed through coherent methods, in frequency domain, or directly in time domain, through an ultrafast analyser, such as the streak camera. The basic principles and limiting factors for both methods will be analysed.
