Radiation from magnetized wakes in ultra-short high intensity laser pulse and gas jet plasma interaction

Summary form only given, as follows. Using a gas jet flow, via the interaction between an ultra-short and high intensity laser pulse and plasma in the presence of a perpendicular external DC magnetic field, the short pulse radiation from magnetized plasma wakefields have been observed. The wakefields are excited by a mode locked Ti:sapphire laser beam. Different nozzles are used in order to generate different densities and gas profile. The neutral density of the gas jet flow in lower pressure regime is measured with a Mach-Zehnder interferometer. The external DC magnetic field strength between 0 to 8 kG is applied at the interaction region normal to the direction of the laser pulse propagation. The frequency of the emitted radiation with the pulse width of 200 ps (detection limitation) is in the millimeter wave range. The radiation is polarized perpendicularly to the laser pulse propagation and the DC magnetic field directions. The radiation mainly propagates in the forward direction. Intensity of the radiation in the different plasma density and magnetic field strength has been observed. The emergence of this radiation field is due to the dependence of radiation characteristics on the plasma parameters, which enable the radiation to be tunable in the frequency, the pulse duration and the intensity.