Amplitude-division ring interferometer for coherent optical beam combination
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Solution Overview
Problem
Existing methods for coherent recombination of optical beams face challenges in maintaining stable relative phases and achieving high energy and power levels while preserving spatial, spectral, and temporal qualities, particularly due to limitations in optical components and the introduction of non-linear effects.
Innovation Solution
A passive device utilizing an amplitude-division ring interferometer with bidirectional optical components for amplification and spectral broadening, ensuring reciprocal optical paths to maintain coherent recombination of optical beams, thereby stabilizing the relative phase and enhancing energy and power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If several independent amplifiers are used to increase energy and power levels, then the energy and power of the optical beam are improved, but maintaining stable relative phase between beams becomes difficult
Solution Approach 1:
The optical beam is divided into multiple separate beams that are amplified independently by different amplifiers, then recombined. This allows each amplifier to operate at optimal power levels while the combined output achieves higher total power, resolving the contradiction between power scaling and phase stability.
Solution Approach 2:
The invention employs active feedback control systems that continuously monitor and adjust the phase of individual beams to maintain stable relative phases during recombination. This feedback mechanism compensates for phase fluctuations and enables coherent combination of high-power beams.
2Power
If optical amplification is performed in non-linear optical medium, then the energy and power of the beam are increased, but non-linear effects deteriorate the optical quality
Solution Approach 1:
The amplification process is segmented into multiple independent stages, each operating at lower power levels that avoid non-linear effects. By distributing the total amplification across multiple segments rather than using a single high-power amplifier, the system achieves high output power while preserving beam quality.
Solution Approach 2:
The invention introduces intermediary optical components and passive recombination structures that mediate between the amplification stages and the final output. These intermediaries enable coherent combination of amplified beams without requiring the beams to pass through non-linear media at high intensities.
3Power
If high average power amplification is performed, then the power output is increased, but spatial properties of the beam deteriorate due to thermo-optical effects
Solution Approach 1:
The high average power amplification is divided into multiple independent amplifier channels, each operating at lower power levels that minimize thermo-optical effects. The segmented approach allows each amplifier to maintain good spatial beam quality while the combined output achieves high total average power.
Solution Approach 2:
Multiple beams with good spatial quality, generated by independent amplifiers operating at moderate power levels, are coherently combined to produce a single high-power beam. This merging process achieves high average power output without the thermo-optical degradation that would occur in a single high-power amplifier.
4Device complexity
If passive recombination device is used, then the device complexity is reduced, but the stability of the passive device is limited by phase-shifts
Solution Approach 1:
The recombination function is segmented into multiple independent optical paths that are later combined. This segmentation allows each path to be optimized independently and reduces the complexity of any single recombination element, while the overall system achieves high stability through coherent combination.
Solution Approach 2:
The invention incorporates feedback control mechanisms that actively monitor and correct phase shifts in the optical paths. This feedback compensates for the inherent limitations of passive recombination devices, maintaining high stability without requiring overly complex passive structures.
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 solution achieves efficient coherent combination of optical beams with high energy and power levels, maintaining excellent spatial, spectral, and temporal qualities without the need for complex electronic feedback systems, and effectively limits non-linear effects.
Implementation Method 1
at least one bidirectional optical component arranged on the optical path of said ring interferometer, said at least one bidirectional optical component being adapted to amplify and/or spectrally broaden
Implementation Method 2
said at least one bidirectional optical component being adapted to amplify and/or spectrally broaden
Implementation Method 3
amplitude-division ring interferometer with bidirectional optical components for amplification and spectral broadening, ensuring reciprocal optical paths to maintain coherent recombination
Data Source
AI summary
A method and passive device for the coherent combination of two amplified and/or spectrally broadened optical beams using at least one bidirectional optical component (A1, A2), the device includes an amplitude division ring interferometer having optical splitting and recombining elements disposed so as to receive an incident optical beam (S0) and to split it spatially into a first secondary input beam (H1) and a second secondary input beam (H2), optical guiding elements disposed so as to define an optical path in the form of a ring in the interferometer, the at least one bidirectional optical component being disposed on the optical path of the ring interferometer, the splitting and recombining elements being disposed in such a way as to receive and to recombine spatially, temporally and coherently the first secondary output beam (H1″) and the second secondary output beam (H2″), so as to form a coherent output beam.