掠入射低功率密度驱动Ni-like AgX射线激光的理论研究
Theoretical research on Ni-like Ag X-ray laser by grazing incidence in 1.2×1013 W·cm-2
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摘要: 用系列程序对掠入射方式驱动亚稳态类镍银的碰撞激发机制进行数值模拟。结果发现：与正入射方式相比，掠入射在1.2×1013 W·cm-2低功率密度驱动时，驱动激光能量主要沉积在增益区附近，可以大幅度提高增益区的电子温度，也可以大幅度提高增益系数。通过对预主脉冲时间间隔和掠入射角的优化，采用10.5 ns延迟时间和16°的掠入射角，可使有效增益系数达到23.8 cm-1，比正入射提高84％。用13 J驱动激光能量就可以获得增益长度积为23.8的深度饱和增益。Abstract: Using our series codes, quasi-stable Ni-like Ag collisional excitation scheme driven by laser with grazing incidence was studied. Comparing with that with normal incidence, at low drive intensity of 1.2×1013 W·cm-2, the laser energy is mainly deposited around gain region, and the electronic temperature on the gain region can be dramatically increased, as well as gain coefficients. The delay time and the grazing incidence angle were optimized. If the delay time of 10.5 ns and grazing incidence angle of 16 degree are adopted, the effective gain of grazing incident scheme reaches 23.8 cm-1, which is 84% higher than that of normal incidence. Using driving laser energy of only 13 J, deeply saturated gain with gain length product being 23.8 can be obtained.
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