Ultrafast time resolution 2D imaging technology based on photoelectron pulse quasi-linearly dilation

In order to record the ultrafast light pulse signal, a technology based on photoelectron pulse quasi-linearly dilation was presented. The photoelectron pulse went in the acceleration region on the calculated time to be accelerated by a high frequency varying electrical field, and then came into the uniform speed drift region to be quasi-linearly dilated. Using the gated Micro-channel Plate (MCP) detector whose time resolution was 100 ps on the recording surface to accept the electron pulse，the time resolved 2D imaging could be achieved. The system spatial resolution and image distortion were improved by an axial focusing magnetic field. For an electron beam whose energy was 4 keV and emit angle was 0.1, the optimal intensity of the focusing magnetic field was 0.057 T which could lead a 5 lp/mm resolution at the center of the photocathode while lower at the edge. Based on this technology, when the drift distance was 50 cm, the dilation magnification came to be 10, thus the temporal resolution of the 2D imaging system could be reduced to 10 ps.