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

A technology of impulse coupling and microstructure, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as unseen processing design, and achieve the effect of weakening and eliminating the effect of heat conduction

Inactive Publication Date: 2013-07-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing related research is limited to the general description of femtosecond laser-induced micro-nanostructure phenomena. At present, we have not seen the application of femtosecond laser to the processing design and fabrication of solid targets in ablation laser propulsion, and Further measurements confirm its impulse coupling performance in ablative laser propulsion related reports

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0031] In the first step, the 10×10×2 cubic millimeter block aluminum target sample is ground and mechanically polished with 400-800 water sandpaper step by step, and the scanning electron micrograph of the sample surface is as follows: figure 1 shown. Ultrasonic cleaning with deionized water, then place it in a clean open container for use;

[0032] In the second step, a high-sensitivity torsion balance device was established to accurately measure the momentum generated by the above-mentioned ordinary metal aluminum target sample during the ablation laser propulsion process, and to study the enhancement degree of the impulse coupling. Experimental device such as Figure 5 (a) shown. In order to prevent the influence of air flow on the measurement of the torsion balance, the entire torsion balance device is placed in an airtight plexiglass cover. The ultra-short laser pulses used to ablate the target and the He-Ne laser signals used to detect the rotation of the torsion ba...

Embodiment 2

[0036] The first step is the same as in Example 1.

[0037] In the second step, in the air environment, the incident femtosecond laser pulse is vertically focused on the solid metal aluminum target sample processed in the first step using a microscope objective lens or an optical lens, and the sample surface is adjusted to In the range of 10-250 microns away from the focal plane;

[0038] The third step is to set the experimental parameters for femtosecond laser preparation: pulse repetition frequency 1 kHz, pulse width 50 femtoseconds, pulse center wavelength 800 nanometers, and the distance between adjacent laser processing scribe lines can be 20-100 microns The scanning speed of sample movement can be selected within the range of 0.05-1 mm / s, and the polarization direction of femtosecond laser and the scanning direction of sample movement can be at any angle.

[0039] The fourth step is to adjust the average power of the incident laser pulse to 40 milliwatts. After the met...

Embodiment 3

[0044] Except that the average power of the incident laser pulse was adjusted to 140 milliwatts during the preparation of the microstructured solid target by the femtosecond laser, other technical steps and experimental conditions were the same as in Example 2. In this case, it was observed experimentally that the surface of the metal aluminum target sample irradiated by the femtosecond laser also formed a stripe-like microstructure formed by a plurality of protrusions, and the scanning electron micrograph is shown in image 3 shown. and figure 2 In comparison, we know that when the incident laser power becomes larger, the size of the convex structure formed on the surface of the metal aluminum target sample gradually becomes smaller. The relationship between the impulse coupling coefficient of the surface microstructure metal aluminum target sample and the laser flow rate is as follows: Figure 6 of shown in the curve. We found that under this condition, the microstruct...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/00B23K26/42B23K26/36B23K26/60
Inventor 杨建军张楠杨阳黄鹏朱晓农
Owner NANKAI UNIV
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