Abstract
We investigate a laser wakefield excited by intense laser pulses, and the possibility of generating an intense bright electron source by an intense laser pulse. The coherent wakefield excited by 2 TW, 50 fs laser pulses in a gas‐jet plasma around 1018 cm−3 is measured with a time‐resolved frequency domain interferometer (FDI). The results show an accelerating wakefield excitation of 20 GeV/m with good coherency. This is the first time‐resolved measurement of laser wakefield excitation in a gas‐jet plasma. The experimental results agree with the simulation results and linear theory. The pump‐probe interferometer system of FDI will be modified to the optical injection system as a relativistic electron beam injector. In 1D particle in cell simulation we obtain results of high quality intense electron beam generation.
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