High power excimer laser has significant technical advantages such as good irradiation uniformity on target surface, repeatable operation and high electro-optical efficiency. It has played an important role in the research fields of inertial confinement fusion, high energy density physics and plasma physics. In this paper, the development of angular multiplexing MOPA system of a high power XeCl excimer laser experimental platform is introduced, including system design, engineering design, system construction, platform performance test and so on. Through the development of the system, the performance index of the experimental platform is significantly improved, including the pulse width is compressed from 200ns to 2~8ns (adjustable), the focal spot on the target surface is compressed from mm level to 260~800μm (adjustable), the power density is increased from 1011W/cm2 to 1013W/cm2, and the uniformity of single beam spot on the target surface reaches 5.2%, while the spot uniformity of 18 laser beams reaches 2.0%.
High-power laser facility is becoming an important experimental platform for the study of micro-ejection phenomenon, and X-ray radiography is an important diagnostic technique in this experiment. Compared to the X-ray radiography driven by picosecond or femtosecond laser, the X-ray radiography driven by nanosecond laser can capture multiple images of different time in a single experiment, which is helpful for the evolution diagnosis in high energy density physics. However, this is difficult for a nanosecond laser with only a few dozen of joules of energy, requiring very sophisticated design. This paper introduces the design of high spatial resolution X-ray radiography based on a nanosecond laser with dozens of joules. Firstly, the numerical simulation work is introduced, including the analysis of laser driven micro-ejection experiments and the X-ray backlight characteristic of different types of backlighting target by using the radiation hydrodynamics code. Secondly, the design of the experimental target based on the physical analysis and the target chamber structure is presented.
High power excimer laser has the characteristics of good irradiation uniformity on target surface, repeatable operation and high electro-optical efficiency. It has played an important role in the research fields of inertial confinement fusion, high energy density physics, plasma physics, and so on. In this paper, the high power XeCl excimer laser device in Northwest Institute of Nuclear Technology is briefly introduced. Secondly, the application progress of the device is introduced, which mainly includes the research work in laser-plasma interaction, high temperature explosion simulation, high pressure flying plate drive, solid material sound velocity measurement, X-ray framing camera performance assessment, multi-angle shock diagnosis target structure verification. Finally, the future application of the device is prospected.
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