Abstract
Understanding the mode components is of great importance to manipulate the optical modes and to improve the optical system performance. However, various forms of aberrations, stemming from misalignment and imperfect optical components and system design, degrade the performance of the modal decomposition (MD) system. Here we analyze the influence of various Zernike aberrations on MD performance in large-mode-area fiber laser systems. Using computer-generated optical correlation filter together with angular multiplexing technique, we can simultaneously measure multi-modal contents. Among the common aberrations, we find that the MD results are least sensitive to vertical astigmatism aberration. However, the vertical coma aberration and horizontal coma aberration have a large impact on MD results under the same aberration strength, which show a rather large change in modal weight and intermodal phase. Our analysis is useful to construct a precise MD system applicable for high-power optical fiber modal analysis and mode control.
Highlights
High-power fiber lasers have shown wide applications in industrial processing, fundamental science, and national defense [1]
We investigated the impact of various Zernike aberrations on the modal decomposition (MD) performance in LMA fiber laser systems
Multi-modal contents were simultaneously acquired via the use of an angular multiplexing computergenerated hologram (CGH) using the optical correlation filter (OCF) method
Summary
High-power fiber lasers have shown wide applications in industrial processing, fundamental science, and national defense [1]. Possible aberrations under different strengths are induced on the optical field of the fiber laser Their influences on the MD results (including modal weights and intermodal phases) are analyzed. We realize the superimposition of the designed transmission functions and the incident beam Those light containing the same mode information as the filter can be diffracted and converge at the far-field optical axis (r 0). When a LP11e mode passes through a CGH containing its conjugate phase, the optical axis of the far-field Fourier plane will present the maximum value. When a LP11e mode passes through a computer-generated hologram containing its conjugate phase (0--π step), the light intensity in the far-field Fourier plane will present the maximum value. This demonstration shows that the MD results can be greatly deteriorated by the existing aberrations in the optical path
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