Russell Wilcox

Machine learning-enhanced deterministic controls in lasers and accelerators

Dan Wang, Alessio Amodio, Alex Picksley, Anthony J. Gonsalves et autres

Modern laser and accelerator systems demand fast, precise, and scalable multi-input multi-output (MIMO) feedback control. As requirements extend into high-repetition-rate and nonlinear regimes, traditional strategies increasingly struggle to deliver the necessary speed and adaptability. This talk presents two cases where machine learning …

Transverse mode instability (TMI) free high power operation of 85μm core Yb-doped chirally-coupled-core fiber amplifiers

Mingshu Chen, Christopher Pasquale, Jack R. Crandall, I-Ning Hu et autres

We report a TMI-free continuous wave operation of 1.9m-long 85μm core Yb-doped chirally-coupled-core (CCC) fiber amplifier with 333W single mode beam quality output, limited by available 976nm pump power but not the onset of TMI. This is a significantly higher power than …

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Pointing stabilization of a 1 Hz high-power laser via machine learning

Alessio Amodio, Dan Wang, Curtis J. Berger, Hai-En Tsai et autres

Abstract High-power lasers are vital for particle acceleration, imaging, fusion and materials processing, requiring precise control and high-energy delivery. Laser plasma accelerators (LPAs) demand laser positional stability at focus to ensure consistent electron beams in applications such as X-ray free-electron lasers and …

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Machine Learning based Pointing Stabilization for Low-Repetition-Rate High Power Lasers

Alessio Amodio, Dan Wang, Curtis J. Berger, Hai-En Tsai et autres

A novel machine-learning based closed-loop control system to enhance spatial transverse stability of high-power lasers, overcoming the bandwidth limitations of traditional feedback systems. Tested at the BELLA Center, it achieved sub-µrad stability, marking the first successful predictive control in high-power low-repetition-rate facility.

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Ultra-broadband coherent pulse stacking of Yb fiber amplified ultrashort pulses

Tong Xiang Zhou, Lauren Cooper, Qiang Du, Dan Wang et autres

We theoretically and experimentally show coherent pulse stacking (CPS) can accommodate tens-of-fs pulse durations and has negligible stacking fidelity degradation with increased pulse bandwidth. Simulations prove large number of tens-of-fs pulses can be stacked with high pre-pulse contrast. In an experiment, nine …

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Achievement of Target Gain Larger than Unity in an Inertial Fusion Experiment

H. Abu-Shawareb, Robert L. Acree, P. A. Adams, John J. Adams et autres

On December 5, 2022, an indirect drive fusion implosion on the National Ignition Facility (NIF) achieved a target gain G_{target} of 1.5. This is the first laboratory demonstration of exceeding "scientific breakeven" (or G_{target}>1) where 2.05 MJ of 351 nm laser light …

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Deep Learning for Modeling Dynamic Gain and Nonlinearities in Ultrafast Fiber Amplifiers

Siyun Chen, Dan Wang, Qiang Du, Mahek Logantha et autres

We introduce a deep-learning method for modeling dynamic gain and nonlinearities in ultrafast fiber a mplifiers, overcoming limitations of physics-based models. Trained and tested with experiments, the algorithm can predict accurately, adaptable to varying amplifier conditions.

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Optical pulse combiner comprising diffractive optical elements

Russell Wilcox

This disclosure provides systems, methods, and apparatus related to optical systems. In one aspect, an optical system includes a plurality of optical sources, a first diffractive optical element, and a second diffractive optical element. The plurality of optical sources generates a plurality …

High average power ultrafast laser technologies for driving future advanced accelerators

Leily Kiani, Tong Zhou, S.-W. Bahk, J. Bromage et autres

Abstract Large scale laser facilities are needed to advance the energy frontier in high energy physics and accelerator physics. Laser plasma accelerators are core to advanced accelerator concepts aimed at reaching TeV electron electron colliders. In these facilities, intense laser pulses drive …

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Broadband spectral combining of three pulse-shaped fiber amplifiers with 42fs compressed pulse duration

Siyun Chen, Tong Zhou, Qiang Du, Dan Wang et autres

We demonstrate ultra-broadband spectral combining of ultrashort pulses from Yb-doped fiber amplifiers, with coherently spectrally synthesized pulse shaping, to achieve tens-of-fs pulses. This method can fully compensate for gain narrowing and high order dispersion over broad bandwidth. We produce 42fs pulses by …

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All-fiber integrated 85um core chirally-coupled core fiber high energy amplifiers for compact coherently combined laser arrays

Mingshu Chen, Alexander Rainville, Manoj Kanskar, Ossi Kimmelma et autres

We report development of 85µm core Yb-doped and Ge-doped chirally-coupled-core (CCC) fibers, and their integration via fusion-splicing into an all-fiber optical amplifier system. This system, consisting of a CCC fiber amplifier and a 6+1 fusion-spliced signal-pump-combiner with a passive CCC fiber feed-through …

55-fs pulses from a spectrally combined fiber laser system via coherent spectral synthesis of two pulse shapers

Siyun Chen, Qiang Du, Dan Wang, Antonio Gilardi et autres

We demonstrated 55-fs pulses from spectrally combining two chirped-pulse fiber channels operating at partially-overlapped spectral bands, with a pulse shaper incorporated in each channel. The spectral intensity and phase shaping in two fiber channels are coherently-spectrally synthesized by phase-synchronizing the two channels …