Laser Shock in Liquid Confinement for Higher Pressure Transfer
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Solution Overview
Problem
Current laser shock treatment systems are limited by a breakdown mechanism that restricts the maximum pressure that can be generated due to a saturation of laser intensity at the surface of the confinement medium, preventing effective disassembly of strong assemblies and insufficient material reinforcement.
Innovation Solution
A laser shock system that increases the maximum intensity on the target by utilizing a thicker confinement liquid layer, which shifts the breakdown threshold from the surface to the volume, allowing higher intensities to be achieved without surface breakdown, thereby increasing the maximum pressure generated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a thin layer of confinement medium is used, then the laser intensity can be effectively transmitted to the target, but the maximum pressure is limited due to surface breakdown saturation
Solution Approach 1:
The invention transitions from a two-dimensional surface breakdown problem to a three-dimensional volume breakdown problem by increasing the confinement layer thickness. This dimensional change allows the laser focus to be positioned within the volume rather than at the surface, thereby avoiding surface breakdown saturation and enabling higher pressures to be achieved.
Solution Approach 2:
The invention changes the thickness parameter of the confinement layer from millimeter scale to centimeter scale (e.g., 10-50 cm). This parameter change fundamentally alters the breakdown behavior from surface-dominated to volume-dominated, allowing the laser intensity to exceed the surface breakdown threshold without causing surface breakdown, thus enabling higher maximum pressures.
2Power
If the laser intensity is increased to generate higher pressure, then the treatment effectiveness improves, but surface breakdown occurs that limits further intensity increase
Solution Approach 1:
The invention uses a thick confinement layer as an intermediary medium that allows high laser intensity to reach the target without causing surface breakdown. The thick layer acts as a buffer that delays breakdown to occur in the volume at higher intensities, thereby mediating between the high power requirement and the breakdown limitation.
3Stress or pressure
If a conventional thin confinement layer is used, then the system is simple and cost-effective, but the maximum pressure is insufficient for strong assemblies
Solution Approach 1:
The invention changes the thickness parameter of the confinement layer from millimeter scale to centimeter scale (e.g., 10-50 cm). This parameter change fundamentally alters the breakdown behavior from surface-dominated to volume-dominated, allowing the laser intensity to exceed the surface breakdown threshold without causing surface breakdown, thus enabling higher maximum pressures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases the maximum pressure that can be applied to the target, enhancing the ability to disassemble strong assemblies and reinforce materials, while maintaining cost-effectiveness by not requiring modifications to existing lasers.
Implementation Method 1
The laser creates, by laser ablation, a plasma PLconf of very high pressure
Implementation Method 2
a tank filled with said liquid having a refractive index n
Implementation Method 3
a breakdown mechanism occurring on the surface of the confinement. In fact, the regime of laser/material interaction in the laser shock involves two different types of plasmas: the confined plasma PLconf which develops at the surface of the target... and a breakdown plasma PLbk/s occurring on the surface of the liquid
Data Source
AI summary
A system for treating a target by laser shock in a regime of confinement in a liquid, the system includes a pulsed laser generating a beam having a pulse duration of between 1 ns and 30 ns and a wavelength, a concentrating optical device having a focal length and configured to concentrate the beam on the surface of the target, the incident laser beam on the concentrating device having a diameter, a tank filled with the liquid having a refractive index n, a desired value of the diameter of the beam on a surface of the target being predetermined and named Dst, a thickness of liquid passed through by the beam before reaching the surface of the target being chosen such that a laser intensity on the surface of the liquid (Isl) is less than or equal to a laser intensity on the surface of the target (Ist) divided by 2.