Laser Wavefront Adjustment via Interference Intensity Feedback
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Solution Overview
Problem
Current laser systems face challenges in adjusting laser wavefront profiles to desired profiles due to random phases and intensities, especially when considering environmental disruptions, which affect the coherence and power of high-power laser beams.
Innovation Solution
A method and system that iteratively adjust laser wavefront profiles by generating a second wavefront through interference phenomena, measuring intensities, calculating phase corrections, and applying these corrections to align the laser beam phases with predetermined target phases, using a mixing module, intensity measuring module, calculation unit, and phase adjustment module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If phase-locked loop with filtering by phase contrast is used to adjust laser beam phases, then phase coherence is improved, but the system cannot adapt to random wavefront profiles caused by environmental disruptions
Solution Approach 1:
The patent changes the measurement parameter from phase contrast to intensity measurement. By measuring intensities of the mixed laser field and using iterative optimization algorithms, the system can adapt to any desired wavefront profile including those affected by environmental disruptions, while maintaining phase coherence through the optimization process.
Solution Approach 2:
The patent implements an iterative feedback loop where intensities are measured, phase corrections are calculated, and adjustments are applied repeatedly. This feedback mechanism allows the system to converge to the desired wavefront profile even when environmental conditions change, providing both adaptability and stability.
2Measurement precision
If environmental factors are considered in laser beam propagation, then measurement accuracy is improved, but the adjustment complexity increases significantly
Solution Approach 1:
The patent introduces a mixing module that creates interference patterns between laser beams as an intermediary step. This allows environmental effects to be captured in the intensity measurements without requiring direct measurement of each beam's phase, simplifying the overall adjustment process while maintaining accuracy.
Solution Approach 2:
The patent replaces direct phase measurement mechanisms with intensity-based measurement and computational optimization. By using intensity measurements combined with iterative algorithms, the system achieves accurate wavefront adjustment without complex phase detection hardware, reducing device complexity while maintaining measurement precision.
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 locks the phase of laser beams to predetermined target phases, pre-compensating for environmental disturbances and optimizing laser power by adjusting the wavefront profile to a desired shape, enhancing the stability and coherence of high-power laser sources.
Implementation Method 1
a step of mixing the laser beam or beams, implemented by a mixing module, consisting of generating, from interference phenomena between the laser beam or beams, a laser field forming a second laser wavefront
Data Source
AI summary
A method and system for adjusting the profile of a laser wavefront formed by at least a laser beam to a desired laser wavefront profile, the laser beam or beams presenting random phases and intensities, comprises a mixing module, configured to generate, from interference phenomena among the laser beam or beams, a laser field, a second intensity measuring module configured to measure the mixed intensities of the laser field portions, a calculation unit configured to calculate one or several phase correction values of the phase of the laser beam or the phases of laser beams, from the intensities of the laser beams, the mixed intensities and one or several predetermined target phases, and a phase adjustment module configured to apply the phase correction value or values obtained from the calculation unit to the laser beam phases.