Transmission Adaptive Optics for High-Power Laser Wavefront Correction
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Solution Overview
Problem
Current technologies, such as deformable mirrors, face challenges in correcting wavefront turbulence of high-power laser beams due to cooling limitations and accuracy issues in fine wavefront distortion correction, especially when dealing with high-power laser applications.
Innovation Solution
A transmission type adaptive optical system that includes a laser emission device, a partial reflection mirror, a wavefront sensor, a control device, a heating light source, and a transmission type adaptive optical element, where the refractive index distribution of the adaptive element is adjusted by temperature changes to correct wavefront turbulence, allowing for precise wavefront correction of high-power laser beams without enlarging the optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deformable mirror is used to correct wavefront turbulence, then wavefront correction is achieved, but the system cannot handle high-power laser beams beyond a certain level due to cooling limitations
Solution Approach 1:
The patent replaces the mechanical deformable mirror system with a thermal-optical correction system. Instead of mechanically deforming a mirror surface, the invention uses temperature-controlled refractive index changes in a fluid medium to correct wavefront distortion. This substitution eliminates the cooling limitations of mechanical systems while maintaining wavefront correction functionality.
Solution Approach 2:
The invention changes the physical parameter used for wavefront correction from mechanical deformation to thermal-optical parameter changes. By controlling the temperature distribution in the fluid medium, the refractive index distribution is modified, enabling wavefront correction without the mechanical cooling constraints.
2Adaptability or versatility
If a fluid optical element is used to correct wavefront turbulence, then lens effect control is achieved, but accuracy in correcting fine wavefront distortion is difficult due to convection in liquid
Solution Approach 1:
The patent employs a composite material system consisting of a solid transparent material containing suspended particles or droplets of liquid crystal or other optically active fluid. This composite structure allows the solid matrix to provide mechanical stability and suppress convection, while the suspended optically active components provide the desired lens effect and wavefront correction capability.
Solution Approach 2:
The invention creates local quality variations in the composite material by distributing optically active particles or droplets throughout the solid matrix. This allows localized refractive index changes for wavefront correction while the overall solid structure maintains stability and suppresses convection currents.
3Power
If a transmission type adaptive optical element is used, then high-power laser beam correction is enabled, but the optical system size increases
Solution Approach 1:
The patent merges the adaptive optical element directly into the existing optical path without requiring separate correction systems. The transmission-type element is integrated into the laser beam path, allowing high-power beam correction while maintaining a compact overall system footprint by eliminating the need for additional separate correction 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
Enables effective correction of wavefront turbulence in high-power laser beams by precisely controlling the refractive index distribution, improving beam quality and extending the output-power range without the need for a larger optical system.
Implementation Method 1
a transmission type adaptive optical element which transmits the laser beam and corrects the wavefront of the laser beam by a refraction index distribution adjusted by a temperature distribution occurred by irradiation of heating light
Implementation Method 2
corrects the wavefront of the laser beam by a refraction index distribution adjusted by a temperature distribution
Data Source
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AI summary
The present invention provides a transmission adaptive optical system adaptable to a high-output laser beam beyond the limit of a variable shape mirror and capable of adapting to a fluctuation in laser beam wavefront to correct the fluctuation. The transmission adaptive optical system adapts to a fluctuation in laser beam wavefront, thereby correcting the fluctuation with a transmission adaptive optical element in which a refractive index distribution fluctuates in accordance with the temperature distribution in the transmission adaptive optical element. A wavefront fluctuation is detected with a wavefront sensor and heating light in accordance with the detected wavefront fluctuation is emitted to irradiate the transmission adaptive optical element. The transmission adaptive optical element transmits a laser beam for which the wavefront fluctuation is to be corrected, while genersting a temperature distribution based on the heating light to there by create a refractive index distribution.