Crystalline Optical Beam Trap for Particle-Free Laser Termination
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Solution Overview
Problem
Existing beam traps for laser radiation often result in undesirable particle removal due to short absorption lengths and material properties, leading to contamination of the environment and laser system components, even at low laser intensities.
Innovation Solution
A method utilizing a crystalline absorption body with a small imaginary refractive index, ensuring absorption lengths of over 1 mm, combined with good thermal conductivity and anti-reflective coatings to minimize reflection and facilitate heat dissipation, thereby preventing particle detachment and ensuring efficient absorption of laser radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If materials with short absorption lengths (metals, ceramics) are used in beam traps, then laser radiation can be absorbed, but particle removal and material detachment occur due to high local intensity
Solution Approach 1:
The patent changes the fundamental parameter of absorption length by selecting crystalline materials with specifically small imaginary refractive indices (ni ≤ 10^-4), resulting in absorption lengths of >1 mm. This parameter change distributes the laser energy absorption over a larger volume, reducing local intensity and preventing particle detachment while maintaining effective laser radiation termination.
Solution Approach 2:
The patent employs composite material structures combining crystalline absorption bodies with specific surface coatings. The crystalline material provides deep volume absorption with low imaginary refractive index, while surface coatings (such as dielectric or metallic layers) enhance surface absorption and manage reflections, creating a multi-functional composite system that prevents particle removal while efficiently terminating laser radiation.
2Use of energy by moving object
If highly absorbent materials are used in beam traps, then laser radiation is absorbed, but heat dissipation becomes difficult due to poor thermal conductivity
Solution Approach 1:
The patent creates a composite material system where the crystalline absorption body provides deep laser radiation absorption with good thermal conductivity, and is combined with surface coatings that enhance absorption while the overall structure incorporates heat dissipation mechanisms such as heat sinks or cooling channels, achieving both effective absorption and temperature management.
Solution Approach 2:
The patent applies different material properties to different parts of the beam trap system: the crystalline absorption body has optimized optical properties (small imaginary refractive index) for deep absorption, while surface regions have specialized coatings for enhanced absorption and reflection management, and the structure includes dedicated heat dissipation regions with high thermal conductivity materials, creating local quality optimization throughout the system.
3Use of energy by moving object
If surface coatings are applied to increase absorption, then absorption is improved, but particle removal may occur from the coating material
Solution Approach 1:
The patent employs carefully selected surface coatings (dielectric or metallic layers) applied to the crystalline absorption body. These coatings are chosen for their high damage thresholds and strong adhesion to the substrate, creating a composite structure where the coating enhances surface absorption and manages reflections without detaching, while the underlying crystalline material provides deep volume absorption.
Solution Approach 2:
The patent optimizes coating parameters including thickness, material composition, and optical properties to achieve high absorption efficiency while maintaining damage thresholds above the local laser intensity. The coating design parameters are specifically tailored to prevent material detachment while maximizing absorption performance.
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
The solution effectively reduces or prevents particle removal, ensuring safe and efficient termination of laser radiation while maintaining good heat dissipation, even at high laser powers, by distributing absorption over a larger depth and using materials with higher damage thresholds.
Implementation Method 1
the absorption body is selected from a crystalline, preferably monocrystalline, material with a sufficiently small imaginary refractive index for the optical radiation to be absorbed, which leads to an absorption length of the optical radiation of > 1 mm in the absorption body
Implementation Method 2
the absorption body is in contact with a cooling medium, in particular a heat sink, on the side surfaces
Data Source
Figure 1~2
AI summary
In a method for terminating optical radiation, in particular laser radiation, the optical radiation (1) is directed to an absorption body (3), which absorbs the radiation (1). In the method, the absorption body (3) is chosen to be made of crystalline material with an imaginary refractive index for the optical radiation (1) to be absorbed, which leads to an absorption length of the optical radiation of >1 mm in the absorption body (3). As a result of this choice of material of the absorption body, unwanted particle ablation is avoided when terminating the optical radiation.