3.38 kW all-fiberized narrow linewidth fiber laser based on active polarization control using RMS-Prop algorithm

Ren, Shuai; Chang, Hongxiang; Ma, Pengfei; Chen, Yisha; Wang, Guangjian; Li, Wei; Liu, Wei; Yao, Tianfu; Zhang, Pu

doi:10.1016/j.optlastec.2023.109634

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…The seed laser was stretched by two cascaded chirped fiber Bragg gratings (CFBGs) with a minimum 3-dB bandwidth of 11 nm to a full width of 2 ns, to reduce the peak power and mitigate the nonlinear effects during pulse amplification. After stretching, the linearly polarized laser pulse was injected into a polarization controller (PC), which is composed of four piezoelectric ceramics [40,42] . The polarization state of the laser signal can be electronically adjusted by manipulating the analog voltage signal that is applied to each piezoelectric ceramic, which has a 3-dB bandwidth of 16 kHz.…”

Section: Methodsmentioning

confidence: 99%

“…Afterward, the analog voltage signal that was generated by the PD was processed by the RMS-prop controller to produce a control signal for the PC for minimizing the power of the vertical polarized light while in the meantime maximizing that of the horizontal polarized light. The RMS-prop algorithm is an optimized neural network algorithm that exhibits high control accuracy and fast convergence [42,43] , enabling effective and real-time active polarization control.…”

Section: Methodsmentioning

confidence: 99%

“…After that, IPG Photonics Corp. presented a 2.5 kW linearly polarized laser output by controlling the polarization state of the input signal of a non-PM fiber amplifier, while more details of the control algorithm have not been disclosed [41] . More recently, Ren et al demonstrated a narrow linewidth non-PM all-fiber amplifier that delivers 3.38 kW laser output with a PER of 12.2 dB, with the aid of active polarization control based on the root-mean-square propagation (RMS-prop) algorithm [42] . It is noted that previous demonstrations concerning active polarization control of non-PM fiber amplifiers were mostly focused on narrow linewidth lasers, while its effectiveness on the power scaling of ultrafast laser is yet to be verified.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-power all-fiber linearly polarized Yb-doped chirped pulse amplifier based on active polarization control

Wang,

Ren,

Chang

et al. 2024

中国光学快报

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High-power ultrafast laser amplification based on a non-polarization maintaining fiber chirped pulse amplifier is demonstrated. The active polarization control technology based on the root-mean-square propagation (RMS-prop) algorithm is employed to guarantee a linearly polarized output from the system. A maximum output power of 402.3 W at a repetition rate of 80 MHz is realized with a polarization extinction ratio (PER) of > 11.4 dB. In addition, the reliable operation of the system is verified by examining the stability and noise properties of the amplified laser. The M 2 factor of the laser beam at the highest output power is measured to be less than 1.15, indicating a diffraction-limited beam quality. Finally, the amplified laser pulse is temporally compressed to 755 fs with a highest average power of 273.8 W. This is the first time, to the best of our knowledge, that the active polarization control technology was introduced into the high-power ultrafast fiber amplifier.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-power all-fiber linearly polarized Yb-doped chirped pulse amplifier based on active polarization control

Wang,

Ren,

Chang

et al. 2024

中国光学快报

Self Cite

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A White‐Box Digital Twin for Real‐Time Polarization Tracking

Zhang,

Pu,

et al. 2024

Laser & Photonics Reviews

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Tracking polarization in real‐time is a long‐term challenge. The conventional heuristic and gradient‐descent‐based algorithms for polarization tracking lack efficiency and interpretability. To resolve the problem, a white‐box digital twin modeling the entire polarization tracking system is derived by calculating with Stokes vectors and Mueller matrices. Moreover, the real‐time polarization tracking enabled by the white‐box digital twin is experimentally demonstrated, which is over 7 times faster than the commonly used stochastic parallel gradient descent (SPGD) on average. The adoption of digital twin allows the algorithm to bypass the loop of perturbation, sampling, and adjusting over the real system, thereby significantly reducing the sample times and recovery time. The proposed white‐box digital‐twin‐based algorithm has strong interpretability and high efficiency, which has substantial potential to become a standard approach to achieve real‐time polarization tracking.

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