Adaptive phase correction of dynamic multimode beam based on modal decomposition

Xie, Kang; Liu, Wenguang; Zhou, Qiong; Huang, Liangjin; Jiang, Zongfu; Xi, Fengjie; Xu, Xiaojun

doi:10.1364/oe.27.013793

Cited by 11 publications

(5 citation statements)

References 50 publications

(51 reference statements)

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“…Recently, a demonstrative experiment on adaptive phase correction of a dynamic MM beam based on MD was presented [29] , which verified its feasibility for real-time correction. However, the measurement and correction in this demonstration were aimed at the þ1 st -order diffraction pattern of a spatial light modulator (SLM).…”

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confidence: 79%

“…However, the measurement and correction in this demonstration were aimed at the þ1 st -order diffraction pattern of a spatial light modulator (SLM). This order only accounts for a small fraction of the total power, and the pertinent method [29] cannot correct the entire MM optical field. To further realize correction of the zeroth order, which holds the majority of the total power, an additional phase corrector, such as a DM or SLM, is conventionally introduced.…”

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confidence: 99%

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Real-time phase measurement and correction of dynamic multimode beam using a single spatial light modulator

et al. 2020

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In this Letter, a novel system for adaptively correcting the phase of a dynamic multimode beam is proposed. While using merely one spatial light modulator, the phase measurement of the first-order diffraction pattern and the correction of the zeroth diffraction order are simultaneously realized. The real-time experimental result is obtained at a control rate of 10 Hz. The power-in-the-bucket value is improved from 38.5% to 61.8%, even with fundamental mode content that is consistently below 30%. To the best of our knowledge, this is the first implementation of real-time adaptive correction of the entire multimode beam.

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confidence: 79%

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confidence: 99%

Real-time phase measurement and correction of dynamic multimode beam using a single spatial light modulator

et al. 2020

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“…When the cross-correlation is closer to 1, the MD result is more accurate. Note that the cross-correlation is always greater than 0 [30].…”

Section: Fiber Laser MD Using the Ocf Methodsmentioning

confidence: 99%

Influence of Aberrations on Modal Decomposition for LMA Fiber Laser Systems

et al. 2022

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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.

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“…A mode decomposition system is applied to analyze the real-time modal variation of the co-pumping optical fiber oscillator. A spatial light modulator (SLM) and a HSC are the main components of the mode decomposition device with optical correlation filter (OCF) method [43]. To match the polarization requirement of the SLM, the incident light passes through a polarized beam splitter (PBS).…”

Section: Methodsmentioning

confidence: 99%

Dynamic modal characteristics of transverse mode instabilities in ytterbium-doped fiber laser oscillator

et al. 2023

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In recent years, transverse mode instability (TMI) has been widely observed in fiber laser amplifier systems. The transverse mode instability phenomenon in fiber laser oscillators is less studied. Here, we focus on the dynamical output properties, i.e., its temporal signal and modal characteristics in a 30-μm-core-diameter ytterbium (Yb)-doped fiber laser oscillator. The TMI occurs at a pumping power around 310 W. Different from amplifiers, the basic oscillation frequency is quite low, at around 100 Hz, changing with time and pump power. When the fiber laser oscillator operates beyond TMI threshold at 357 W or 377 W for a while, the temporal fluctuation slowly disappears together with a decreased oscillation frequency, and appears again later. Based on the mode decomposition technique, we find that during the period of fluctuation disappearance at 357 W, the power output stays low and the output beam is still a mixture of fundamental mode and higher-order modes. The fundamental mode content is calculated to be averagely higher when temporal fluctuation disappears, increasing from ∼57% to ∼63%. Our results indicate complex interaction between the fiber laser oscillation and the TMI effect, and calls for more attention into understanding TMI in fiber laser oscillators.

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Adaptive phase correction of dynamic multimode beam based on modal decomposition

Cited by 11 publications

References 50 publications

Real-time phase measurement and correction of dynamic multimode beam using a single spatial light modulator

Real-time phase measurement and correction of dynamic multimode beam using a single spatial light modulator

Influence of Aberrations on Modal Decomposition for LMA Fiber Laser Systems

Dynamic modal characteristics of transverse mode instabilities in ytterbium-doped fiber laser oscillator

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