Stimulated Raman Scattering for Atmospheric Laser Wavefront Cleanup
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Solution Overview
Problem
Existing optical systems for High-Energy Laser (HEL) propagation through the atmosphere face inefficiencies due to molecular absorption, scattering, turbulence, and beam quality issues, which are costly and complex to correct using adaptive optics systems.
Innovation Solution
The system employs a first light beam and a second light beam with higher power to co-align in a parallel or near-parallel pattern within atmospheric space, utilizing Stimulated Raman Scattering (SRS) to transfer energy from the higher-power beam to the lower-power beam, thereby phase conjugating and amplifying the latter without the need for expensive adaptive optics components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional adaptive optics systems with deformable mirrors are used to correct atmospheric turbulence and maintain beam quality, then propagation efficiency is improved, but system cost and complexity increase significantly
Solution Approach 1:
The patent extracts the wavefront correction function from complex deformable mirror systems and implements it through a simplified phase conjugate mirror approach combined with Raman scattering amplification. The phase conjugate mirror captures the distorted wavefront and generates a conjugate signal that automatically compensates for atmospheric turbulence without requiring complex actuator systems.
Solution Approach 2:
The patent introduces a Raman scattering medium as an intermediary between the transmitted beam and the target. This medium amplifies the phase-conjugated beam through stimulated Raman scattering, providing both wavefront correction and power amplification in a single process, thereby eliminating the need for high-power complex adaptive optics systems.
2Stability of the object's composition
If high-power adaptive optics components are deployed to compensate for atmospheric effects, then beam quality is maintained, but susceptibility to optical and electrical damage increases
Solution Approach 1:
The patent creates a phase conjugate copy of the distorted wavefront using a phase conjugate mirror. This conjugate copy contains the inverse of the atmospheric distortions and is used to correct the transmitted beam. The Raman scattering process then amplifies this corrected copy, maintaining beam quality without exposing high-power components to damaging conditions.
3Measurement precision
If standard adaptive optics designs are used to correct atmospheric aberrations, then some turbulence compensation is achieved, but fine-grained high temporal frequency fluctuations cannot be compensated
Solution Approach 1:
The patent performs preliminary wavefront sensing and phase conjugation before the main high-power beam transmission. The phase conjugate mirror pre-corrects the wavefront distortions, and the Raman scattering medium provides final amplification. This preliminary correction approach allows the system to handle fine-grained, high-temporal-frequency fluctuations that would be too complex to manage with real-time adaptive optics control.
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 reduces propagation efficiency degradation, enhances beam quality, and compensates for atmospheric turbulence at a fraction of the cost and complexity of traditional systems, while maintaining high irradiance at the target.
Implementation Method 1
utilizing Stimulated Raman Scattering (SRS) to transfer energy from the higher-power beam to the lower-power beam, thereby phase conjugating and amplifying the latter
Data Source
AI summary
An optical system includes a first light source configured to generate a first light beam having a first power. The optical system includes a second light source configured to generate at least one second light beam having a second power. The second power can be greater than the first power. The optical system includes a device for a least partially co-aligning the at least one second light beam of the second power with the first light beam of the first power in a parallel or near-parallel pattern and within a region of atmospheric space so that energy will transfer from photons of the at least one second light beam of the second power to photons of the first light beam of the first power within the region of atmospheric space via Stimulated Raman Scattering (SRS).