研究目的
Investigating the formation of the feedback loop for phase control of a fiber laser array to achieve coherent combination of linearly polarized fields of narrowband fiber lasers.
研究成果
The study demonstrates the high efficiency of the internal feedback loop for phase synchronization in fiber laser arrays, enabling coherent beam combination without the need for heavy optical elements. The experimental results confirm the feasibility of scaling the power of optical phased arrays using this method.
研究不足
The study is limited by the experimental setup's scalability and the specific conditions under which the feedback loops were tested. Potential areas for optimization include the adaptation of the system for higher power scaling and the reduction of phase mismatch estimation errors.
1：Experimental Design and Method Selection:
The study considers methods for phasing radiation channels for coherent combination, focusing on the internal feedback loop based on interference of peripheral sections of radiation.
2：Sample Selection and Data Sources:
The experiment uses PM980-XP fiber with NA =
3：12 and optical elements corresponding to specified parameters. List of Experimental Equipment and Materials:
Includes a semiconductor DBR laser, fiber amplifier, LiNbO3-based electro-optical phase-controlling elements, aspherical hexagonal lenses, Ophir-Spiricon SP503U beam profiler, Thorlabs PDA10CF and PDA05CF2 photodetectors, and a BASLER Ace acA1300-60NIR CCD camera.
4：Experimental Procedures and Operational Workflow:
The setup combines internal and external feedback loops for phase synchronization, using a stochastic parallel gradient descent (SPGD) algorithm for control.
5：Data Analysis Methods:
The interference pattern and signal levels are analyzed to assess the efficiency of coherent beam combination.
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