Window Beam Sampler Slots for Ghost-Free Laser Sampling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing window-type beam samplers suffer from ghosting effects due to unwanted reflections from the second surface, which interfere with primary beam measurements, complicating accurate analysis.
Innovation Solution
The design incorporates slots or lamellas within the beam sampler that align parallel to the refracted beam, adhering to Snell's law, to minimize back reflections and absorb unwanted secondary reflections, ensuring the integrity of the sampled beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a window-type beam sampler is used to sample laser beam, then beam sampling function is achieved, but ghosting effect occurs due to unwanted reflections from the second surface
Solution Approach 1:
The patent extracts and removes the harmful ghost reflections from the optical path by positioning absorptive material at the rear surface of the window. This selectively removes only the unwanted secondary reflections while preserving the primary beam sampling function, thereby eliminating the ghosting effect that degrades measurement precision.
Solution Approach 2:
The patent converts the harmful back-reflections from the second surface into a beneficial solution by deliberately placing absorptive material to capture these reflections. The harmful ghost beams are transformed into a controlled absorption process, preventing them from interfering with the primary measurement while maintaining the beam sampler's functionality.
2Productivity
If standard optical coatings are applied to control light reflection, then beam sampling efficiency is improved, but ghosting from back surface reflections persists
Solution Approach 1:
The patent introduces an intermediary absorptive material layer at the rear surface of the window, positioned between the incoming laser beam and the environment. This intermediary element selectively absorbs the harmful back-surface reflections while allowing the primary beam sampling function to proceed efficiently, thus resolving the persistence of ghosting despite standard optical coatings.
3Measurement precision
If optical isolation mechanisms are implemented to reduce ghosting, then measurement quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the ghosting mitigation function directly into the beam sampler window structure itself by integrating absorptive material at the rear surface. This combination eliminates the need for separate optical isolation mechanisms, thereby improving measurement quality while avoiding the increased device complexity that would result from additional isolation 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
This approach effectively mitigates ghosting, providing clearer and more reliable laser beam measurements by preventing secondary reflections from exiting the sampler.
Implementation Method 1
When laser radiation encounters different media with different diffraction indices, Snell's law applies. The refractive index measures how much light slows down and bends when entering a medium compared to its speed in a vacuum.
Implementation Method 2
Introducing carefully designed slots into the window beam sampler to prevent back reflections, ensuring a clear and accurate sampled beam
Data Source
AI summary
An optical glass beam sampler is a device used to extract a small portion of a laser beam for purposes such as measurement, monitoring, or analysis. It typically consists of optical glass with specific coatings and dimensions designed to reflect or transmit a small percentage of the incident laser beam while allowing the majority of the beam to continue on its path unaffected. Ghosting effects occur when secondary reflections or beams are created due to reflections from the second surface of a typical window-type beam sampler. This invention aims to prevent ghosting in applications where a small fraction of the beam is split without significantly altering its characteristics. The technology is based on optical slit designs that prevent back reflection, thus eliminating the ghosting effect. By eliminating ghosting, the performance of optical glass beam samplers is greatly enhanced.