High Fidelity Optical Beam Dump with Coated Glass Plates
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Solution Overview
Problem
Existing optical devices face challenges in isolating sensitive receivers from stray light, which can cause detection failure or permanent damage due to high-power laser applications, as current light traps and isolators do not provide sufficient protection.
Innovation Solution
A high-fidelity optical beam dump is designed using multiple glass plates with anti-reflective and high-reflective coatings, and optically absorptive panels within a housing to absorb and trap laser beams, preventing them from reaching detectors, with optional reflective or refractive injection optics and active cooling for high-power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light traps and isolators are used, then the device structure is simple, but the isolation performance is insufficient to protect sensitive detectors from high-power laser stray light
Solution Approach 1:
The optical path is divided into multiple discrete glass plates (at least two, preferably three or more) with alternating anti-reflective and high-reflective coatings. Each plate acts as an independent optical element that contributes to the overall beam trapping effect, allowing the system to achieve high isolation performance through cumulative reflection while maintaining modular simplicity
Solution Approach 2:
The patent introduces high-reflective coating surfaces as intermediary elements between the incoming laser beam and the detector. These coated surfaces act as mediators that redirect and trap the beam through multiple reflections, preventing direct transmission to the detector while managing the optical energy through controlled reflection paths
2Reliability
If the number of reflective surfaces is increased to improve beam trapping, then isolation performance improves, but scattered light reflections from optical surfaces increase
Solution Approach 1:
Different surfaces of the glass plates are given different optical properties: the first sides (entrance surfaces) are coated with anti-reflective coatings to minimize entry reflections, while the second sides (exit surfaces) are coated with high-reflective coatings to maximize beam trapping. This local differentiation of surface properties optimizes the overall system performance by reducing stray light at critical interfaces
Solution Approach 2:
The patent uses composite optical structures combining transparent glass plates with specialized optical coatings (anti-reflective and high-reflective layers). This composite approach allows the system to achieve both transmission and reflection functions within the same optical element, effectively trapping beams while minimizing unwanted scattered reflections from individual surfaces
3Reliability
If high-power laser beams are absorbed by conventional materials, then the beam is trapped, but the materials may be damaged or overheated
Solution Approach 1:
The patent extracts the beam trapping function from simple absorptive materials and implements it through multiple reflective surfaces. Instead of relying on a single absorptive material that would overheat, the system distributes the beam energy management across multiple reflective plates, where the beam is trapped through repeated reflections and gradually diverted away from any single absorption point, reducing thermal load on individual components
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 beam dump achieves an effective backscatter index of 10^-9 to 10^-13, offering 1 million to 1 billion times better isolation than current devices, with the ability to absorb nearly all incoming light, preventing damage to detectors and ensuring reliable operation.
Implementation Method 1
the first sides are coated with an anti-reflective coating
Implementation Method 2
the second sides are coated with a high-reflective coating
Implementation Method 3
the first and second plates are made of a specular absorbing glass
Implementation Method 4
a third plate made of diffuse ground absorbing glass substantially perpendicular to the optical path defined by the first and second plates
Data Source
AI summary
A high efficiency optical beam dump having at least two glass plates configured to define an optical path configured to reflect a beam incident the optical path from plate to plate, wherein the plates include anti-reflective coatings and high reflective coatings and wherein the high-efficiency optical beam dump is capable of very high levels of attenuation through repetitive absorption and reflection of an optical beam.