108  kW, 26  times diffraction limited laser based on a continuous wave Nd:YAG oscillator and an extra-cavity adaptive optics system

Sun, Licheng; Guo, Ya-Ding; Shao, Cuiping; Li, Yang; Zheng, Yamin; Sun, Chuang; Wang, Xiaojun; Huang, Lei

doi:10.1364/ol.43.004160

Cited by 24 publications

(10 citation statements)

References 13 publications

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“…Nonetheless, the IFFM is inapplicable to the wavefront sensorless AO system where neither IF measurement nor wavefront measurement is taken for closed-loop correction. For example, the closed-loop correction mentioned in [19,20] takes the far-field beam quality as the evaluation factor without the IF measurement.…”

Section: Discussionmentioning

confidence: 99%

“…Previous research shows that for an AO system operating indoors, the IF measurement noise δ appears as random and irregular fluctuations in the whole clear aperture [18][19][20]. For each actuator's IF, the peak-to-valley (PV) value of the measured noise δ is generally 20-40% of that of the ideal IF F a .…”

Section: Principles Of the Wavefront Correction Analysis Modelmentioning

confidence: 99%

“…Adaptive optics (AO) is widely employed in many fields, from astronomical observation [1][2][3][4][5][6][7][8] at the macro level to bioimaging microscopy [9][10][11][12][13][14][15] at the micro level and from inertial confinement fusion facilities [12][13][14] at the high-power level to vision science research [15][16][17] at the low-power level. One of the important applications of AO is wavefront correction in laser systems to improve the beam quality of the output laser beam [18][19][20]. An AO system generally consists of a wavefront sensor, a wavefront controller and a wavefront compensator.…”

Section: Introductionmentioning

confidence: 99%

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Filtered Influence Function of Deformable Mirror for Wavefront Correction in Laser Systems

et al. 2021

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An influence function filtering method (IFFM) is presented to improve the wavefront correction capability in laser systems by curbing the correction performance degradation resulted from the IF measurement noise. The IFFM is applied to the original measured IF. The resulting filtered IF is then used to calculate the wavefront control signal in each iteration of the closed-loop correction. A theoretical wavefront correction analysis model (CAM) is built. The impact of the IF measurement noise as well as the improvement of the IFFM on the wavefront correction capability are analyzed. A simulation is set up to analyze the wavefront correction capability of the filtered IF using Zernike mode aberrations. An experiment is carried out to study the effectiveness of the IFFM under practical conditions. Simulation and experimental results indicate that the IFFM could effectively reduce the negative effect of the measurement noise and improve the wavefront correction capability in laser systems. The IFFM requires no additional hardware and does not affect the correction speed.

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Section: Discussionmentioning

confidence: 99%

Section: Principles Of the Wavefront Correction Analysis Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Filtered Influence Function of Deformable Mirror for Wavefront Correction in Laser Systems

et al. 2021

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“…[6][7][8] To date, severalkilowatt average powers from single-aperture solid-state lasers have been demonstrated. [9][10][11] Another approach for power scaling is to use multiple lasers with relatively small output powers and combine them to obtain a single-aperture laser propagation characteristic. This class of techniques is called laser beam combining, and it can be divided into two general groups: coherent beam combining (CBC) and wavelength beam combining (WBC).…”

Section: Influence Of Beam Shape On Piston and Tilt Error In Coherentmentioning

confidence: 99%

Influence of beam shape on piston and tilt error in coherent combined laser array

Gontar

Jabczyński

2019

Opt. Eng.

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An analysis of beam combining quality and the influence of beam profile on tilt and piston error tolerances is presented. We define beam combining performance metrics in terms of powers contained within a specific radius. It is shown that the selection of this radius has a significant effect on the obtained tolerance values. We have taken the tolerance limit as a decrease in intensity of 20%, for piston and tilt error. In addition, for the tilt error, as tolerance limit, we have taken a pointing error equal to the diffraction limit. Our analysis demonstrates that the beam combining performance metric based on the diffraction-limited radius functions best for describing the impact of aberrations on the coherent combined laser array optical system. Our results lead to two important conclusions. First, the tilt error has a greater impact on the degradation of beam quality. Second, a Gaussian beam has greater tolerance for both errors than a top-hat beam. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Wavefront sensorless sensing technology, as compared to adaptive optics systems with wavefront sensing, not only reduces the complexity and cost of adaptive optics systems, but it also has significant advantages in situations with weak light or a large turbulence amplitude with distant targets. As a result, they have attracted widespread attention for laser technology and laser communication applications [1][2][3][4][5][6][7] and are one of the most investigated topics in adaptive optics research [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Optical Closed-Loop Control Based on the Single-Dimensional Perturbation Descent Algorithm

Chen

Zhou

et al. 2023

Sensors

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Modal-free optimization algorithms do not require specific mathematical models, and they, along with their other benefits, have great application potential in adaptive optics. In this study, two different algorithms, the single-dimensional perturbation descent algorithm (SDPD) and the second-order stochastic parallel gradient descent algorithm (2SPGD), are proposed for wavefront sensorless adaptive optics, and a theoretical analysis of the algorithms’ convergence rates is presented. The results demonstrate that the single-dimensional perturbation descent algorithm outperforms the stochastic parallel gradient descent (SPGD) and 2SPGD algorithms in terms of convergence speed. Then, a 32-unit deformable mirror is constructed as the wavefront corrector, and the SPGD, single-dimensional perturbation descent, and 2SPSA algorithms are used in an adaptive optics numerical simulation model of the wavefront controller. Similarly, a 39-unit deformable mirror is constructed as the wavefront controller, and the SPGD and single-dimensional perturbation descent algorithms are used in an adaptive optics experimental verification device of the wavefront controller. The outcomes demonstrate that the convergence speed of the algorithm developed in this paper is more than twice as fast as that of the SPGD and 2SPGD algorithms, and the convergence accuracy of the algorithm is 4% better than that of the SPGD algorithm.

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108 kW, 26 times diffraction limited laser based on a continuous wave Nd:YAG oscillator and an extra-cavity adaptive optics system

Cited by 24 publications

References 13 publications

Filtered Influence Function of Deformable Mirror for Wavefront Correction in Laser Systems

Filtered Influence Function of Deformable Mirror for Wavefront Correction in Laser Systems

Influence of beam shape on piston and tilt error in coherent combined laser array

Adaptive Optical Closed-Loop Control Based on the Single-Dimensional Perturbation Descent Algorithm

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