Study On The Deep Saturation For 46.9nm Laser Pumped By Capillary Discharge

Since the last century in the early 1960s, when Theodore Harold Maiman invented the first ruby laser, laser technology had been rapidly developed, and now the laser technology has taken an important position in people's life and work. X-ray laser (center wavelength in 1~100nm) has instant high brightness, short wavelengths and short pulse lasted time,it has been taken lots of attentions by researchers of different countries. The X-ray laser first output was got in 1984. Our laboratory soft X-ray laser is got by the way of capillary discharge, and this pump way is considered as one of the most possible way to achieve X-ray lasers miniaturization industrialization.In this paper, the main part is the research of soft X-ray laser deep saturated. In the previous experiments, we have gained saturated output, which gl=19.6, in 35cm long capillary. Therefore, we want to improve the value of gl by increasing capillary length, and obtain the deep saturated laser output. In the second chapter each key components of laser were introduced in detail, including, Marx generator, Blumlein transmission lines, the main switch, pre pulse switch and pre pulse system. In order to accommodate 45cm long capillary, the discharge chambe is replaced, and the basic operation process of the laser is introduced.In soft X-ray laser deep saturated output experimental study, chapter 3 and chapter 4 carried on the research of soft X-ray laser optimal output condition and the deep saturated of laser output. The research of the best output conditions is by changing the amplitude of main pulse and the pressure of Ar in capillary, in these case the amplitude of laser output and stability of laser output are analyzed, ultimately the experimental parameters of the main pulse and the press in capillary are determined. Through the data of experimental, the relation of the output laser and the experimental parameters, which are main pulse and press in capillary, is analyzed. The experimental section of the fourth chapter is by changing the length of electrode to change the length of gain in capillary. in this way the amplitude of laser output in different length of gain can be obtained. The gain coefficient of capillary discharge can be obtained by simulation of Linford formula, then the value of gl is calculated, it is proved that the deep saturated output had been obtained in the condition of best output of light. In addition, the the energy of the laser output is calculated, which is 125μJ. Theoretically, chapter 4 analyzes Z-pinch in capillary by Snow plow model, systematically dependence of the radius of plasma on the initial Ar pressure and the amplitude of main pulse current. The curve which is the relation of radius of plasma and main pulse current in different pressure of Ar in capillary is drawn by C programming language. Through the combine of experimental data and the theoretical analysis, the influence of gain coefficient is obtained by changing the main pulse current and changing the pressure of Ar in capillary.