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为了提高激光推进的耦合效率,防止光学器件污染,提出了透射式液体工质的激光推进模式。在这种推进模式中,Nd:YAG固体激光器中产生的450 mJ,7 ns激光穿过透明的玻璃基底后,与燃烧室中的液体推进剂相互作用,产生的等离子体在玻璃基底、燃烧室和液体推进剂的约束下膨胀,产生很高效率的动量转换,使靶获得初速度。纯水和黑墨水分别被用作推进剂,通过比较实验结果发现,在这种模式中墨水比水更适合做推进剂。通过改变燃烧室的长度和孔径,得到的耦合系数的最大值为17 858.3 N/MW。
In order to improve the coupling efficiency of laser propulsion and prevent the contamination of optics, a laser propulsion mode of transmissive liquid working fluid is proposed. In this mode of advancement, a 450 mJ, 7 ns laser generated in a Nd: YAG solid laser passes through a transparent glass substrate and interacts with a liquid propellant in the combustion chamber to create a plasma that passes through the glass substrate, the combustion chamber And liquid propellant to expand under the constraint, resulting in very efficient momentum conversion, the target to obtain the initial velocity. Pure water and black ink were used as propellant, respectively, by comparing the experimental results found in this mode ink is more suitable than water as a propellant. By changing the length and the aperture of the combustion chamber, the maximum value of the coupling coefficient is 17 858.3 N / MW.