研究目的
Investigating the application of deep learning in tiled aperture coherent beam combining systems for phase control.
研究成果
The DL-based phase control method is feasible and extensible for tiled aperture coherent beam combining systems, offering a non-iterative approach to phase error compensation that does not increase in complexity with the number of array elements. The method shows potential in improving the phase control bandwidth of CBC systems, with further optimizations expected to enhance accuracy for larger arrays.
研究不足
The study notes a slight decrease in the accuracy of the CNN as the number of array elements increases, which is attributed to the increased complexity of the non-focal-plane intensity profile. This limitation is expected to be addressed by optimizing the CNN structure, increasing the number of training samples, and incorporating optimization algorithms.
1：Experimental Design and Method Selection:
The study incorporates deep learning into tiled aperture coherent beam combining systems, using a convolutional neural network (CNN) model trained at a non-focal-plane to estimate and compensate for phase errors.
2：Sample Selection and Data Sources:
The research involves simulating the coherent combining of 7-element and 19-element hexagonal arrays to demonstrate the method's feasibility and extensibility.
3：List of Experimental Equipment and Materials:
The setup includes a seed laser, pre-amplifier, fiber splitter, fiber phase modulators, fiber amplifiers, collimator array, highly reflective mirrors, focus lens, beam splitter, and CCD for intensity profile collection.
4：Experimental Procedures and Operational Workflow:
The intensity profile of the combined beam at the non-focal-plane is used to train the CNN for phase error estimation, which is then compensated by a servo phase control system.
5：Data Analysis Methods:
The performance of the DL-based phase control method is evaluated using metrics such as Strehl ratio, fringe contrast, and power in the bucket (PIB).
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seed laser
Provides the initial laser beam for amplification and splitting.
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pre-amplifier
Amplifies the seed laser beam before splitting.
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fiber splitter
Splits the amplified laser beam into multiple channels.
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fiber phase modulator
Modulates the phase of each laser beam channel.
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fiber amplifier
Amplifies the laser beams in each channel.
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collimator array
Collimates the laser beams for free-space propagation.
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highly reflective mirror
Splits the collimated beam array for phase control and observation.
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focus lens
Focuses the combined beam for observation at the focal plane.
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beam splitter
Samples the combined beam for phase control and observation.
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CCD
Collects the intensity profile of the combined beam at the non-focal-plane.
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