Nano-Textured Attenuator for High-Power Laser Beam Profiling
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Solution Overview
Problem
High-power laser systems pose challenges for existing beam profiling and characterization systems due to the saturation of 2-D matrix sensors and the degradation of thin-film coated attenuators, which can lead to potentially damaging fluence on sensitive cameras and sensors.
Innovation Solution
A nano-textured attenuator is designed to handle high-power laser beams by using nano-textured beamsplitters that transmit a significant portion of the input beam while reflecting a small percentage to form a partially attenuated beam, which is further attenuated by additional nano-textured optical components to a level safe for measurement by cameras and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thin-film coated attenuators are used to reduce output beam fluence, then sensor saturation is prevented, but the attenuator performance degrades due to exceeding damage threshold
Solution Approach 1:
The patent changes the physical structure of the attenuator surface from smooth thin-film coatings to nano-textured surfaces with controlled roughness. This structural parameter change allows the attenuator to handle high power densities without degradation, resolving the reliability issue while maintaining measurement precision through controlled light scattering and absorption.
Solution Approach 2:
The patent uses composite structures combining nano-textured surfaces with specific substrate materials. The nano-texturing creates a composite surface structure that provides both durability against high power densities and controlled optical attenuation, preventing both sensor saturation and attenuator degradation.
2Productivity
If high power density laser beams are measured directly, then measurement speed is maintained, but sensors are damaged by excessive fluence
Solution Approach 1:
The patent introduces a nano-textured attenuator as an intermediary component between the high-power laser beam and the sensor. This intermediary safely reduces the fluence to sensor-safe levels while maintaining measurement speed, as the attenuator is designed to handle the full power density without degradation.
3Measurement precision
If thin-film coated attenuators are used to reduce beam fluence, then sensor saturation is prevented, but damaging fluence still reaches sensors due to attenuator degradation
Solution Approach 1:
The patent changes the surface morphology parameter from smooth to nano-textured, which fundamentally alters how the attenuator interacts with high-power laser beams. The nano-textured surface provides enhanced damage resistance and consistent attenuation performance, eliminating the risk of residual damaging fluence while maintaining accurate beam intensity measurement.
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 nano-textured attenuator effectively reduces the power of high-power laser beams to safe levels for measurement, preventing damage to sensors and cameras while maintaining the ability to accurately characterize the laser beams.
Implementation Method 1
the first nano-textured beamsplitter is configured to transmit 85% to 99.9999% of an input beam therethrough while reflecting 0.0001% to form at least one partially attenuated beam
Data Source
AI summary
The present application discloses a nano-textured attenuator which includes a body defining an input aperture, a measurement aperture, and at least one beam dump aperture. At least one coupling fixture may be formed on or positioned on the body, a first nano-textured beamsplitter is positioned within the body and configured to transmit 85% to 99.9999% of an input beam therethrough while reflecting 0.0001% of the input beam to form a partially attenuated beam, at least a second nano-textured beamsplitter is also positioned within the body and is configured to transmit 85% to 99.9999% of the partially attenuated beam therethrough while reflecting 0.0001% of the partially attenuated beam to form an attenuated measurement beam, and at least one camera in communication with the measurement aperture be configured to measure at least one optical characteristic of the attenuated measurement beam.