Method for preparing microstructural target by using laser to improve laser propulsion impulse coupling coefficient

Abstract

The invention discloses a method for preparing a microstructural target by using laser to improve a laser propulsion impulse coupling coefficient. In the method, preprocessing treatment is performed on a solid target in an ablation laser propulsion technology by a focused near-infrared femtosecond laser pulse, so that microstructures in various shapes can be generated on the surface of the solid target to effectively enhance the impulse coupling coefficient. The microstructural solid target prepared by the femtosecond laser pulse comprises a plurality of types of protruding structures and groove structures which contribute to enhancing light absorption. By a high-sensitivity torsion balance precision measurement device established by experiments, the impulse coupling coefficient of the microstructural solid target is improved by about 170 percent compared with that of a common plane target which is not preprocessed by femtosecond laser within a laser flux variation range of 0.6 to 100joules / square centimeter. The new method for effectively enhancing the conversion from light energy to mechanical energy in the laser ablation process is potentially and importantly applied in the technical field of laser propulsion.

Description

technical field

[0001] The invention belongs to the field of structural design and production of solid targets used in laser propulsion technology, and in particular relates to the preparation of various forms of microstructures on the surface of solid targets by applying femtosecond laser pulses, and the solid targets of these microstructures are shown by precise experimental measurements The impulse coupling performance in ablation laser propulsion can be effectively improved and enhanced. Background technique

[0002] Laser propulsion technology is the first new type of propulsion technology that may realize low-earth orbit launch missions since human beings sent artificial satellites into earth orbit in the 1950s. Compared with traditional chemical propulsion technology, laser propulsion technology has the advantages of higher load ratio, larger adjustment range of propulsion parameters (impulse coupling coefficient and specific impulse), and can exceed the maximum speed...

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