Electro-Optical Phase-Contrast Filtering for Laser Beam Cophasing
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Solution Overview
Problem
Existing methods for generating high laser power by combining elementary laser beams with the same frequencies but different phases face challenges due to phase differences, which affect the efficiency of their combination.
Innovation Solution
An electro-optical method that transforms relative phases of elementary laser beams into light-intensity levels using phase-contrast filtering, calculates phase-correction values, and applies these corrections iteratively to achieve phase convergence without disrupting laser emission, utilizing a matrix equation and phase modulators to optimize cophasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If elementary laser beams are combined to generate high laser power, then the laser power increases, but phase differences between beams reduce the effectiveness of combination
Solution Approach 1:
The patent implements an iterative feedback process where phase-contrast filtering converts phase differences into intensity variations, which are then used to calculate phase-correction values that are applied back to the elementary laser beams. This closed-loop feedback mechanism continuously adjusts the phases of elementary beams to achieve optimal coherence for effective combination, resolving the contradiction between maintaining power through combination and ensuring phase coherence.
Solution Approach 2:
The patent replaces mechanical or manual phase adjustment methods with an electro-optical system using phase-contrast filtering and phase modulators. This substitution enables precise, rapid, and automated phase control of elementary laser beams, allowing effective combination for high power generation while maintaining phase coherence through electronic control rather than mechanical means.
2Reliability
If phase adjustment is performed inside the laser oscillator, then phase convergence is achieved, but laser emission is disrupted during adjustment
Solution Approach 1:
The patent segments the laser system into separate functional components: the laser oscillator that generates elementary beams independently, and a separate phase-adjustment system using phase-contrast filtering and phase modulators. This segmentation allows phase adjustment to be performed on extracted beam portions without disrupting the continuous operation of the laser oscillator, maintaining both phase alignment and emission continuity.
Solution Approach 2:
The patent introduces an intermediary phase-adjustment system that operates on copies or portions of the elementary laser beams rather than directly on the main beams. The phase-contrast filtering device and phase modulators serve as intermediaries that enable phase correction without interrupting the laser emission process, resolving the contradiction between achieving phase alignment and maintaining continuous productivity.
3Power
If iterative phase correction is applied to achieve optimal combining, then combination effectiveness improves, but system complexity increases
Solution Approach 1:
The patent replaces complex mechanical phase-adjustment mechanisms with an electro-optical system based on phase-contrast filtering and phase modulators. This substitution simplifies the overall system architecture while enabling precise iterative phase correction, achieving optimal combined laser power through electronic control rather than complex mechanical arrangements.
Solution Approach 2:
The phase-contrast filtering device serves multiple functions: it acts as a phase-to-intensity converter for measurement, provides feedback signal generation, and enables iterative phase correction. This multi-functionality reduces the need for separate dedicated components for each function, thereby reducing overall system complexity while maintaining the capability for effective phase control and power combination.
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 method enables rapid and efficient phase convergence of elementary laser beams, ensuring they combine effectively to produce a high-power laser source with optimized power and brightness.
Implementation Method 1
the relative phase of each of said elementary laser beams is transformed into a light-intensity level by a phase-contrast filtering applying a matrix equation M
Implementation Method 2
said phase-correction values are respectively applied to the elementary laser beams
Data Source
AI summary
According to the invention, a plurality of elementary laser beams (fi) are generated, the phases of which are adjusted by an electro-optical feedback loop (6, 7i, 8i, 9) implementing the matrix equation of a phase-contrast filtering device (6).