Lauren Cooper

Validation of federated analytics across secure data environments: A comparative study of synthetic healthcare datasets using machine learning and general linear models

Suzy Gallier, Alexander Topham, James A. Hodson, David McNulty et autres

Objectives: To enable research and innovation, most health data systems are moving away from a model of pooled data egress and instead highlight the benefits of federated analytics to support data analysis across different settings. This study aimed to assess whether the …

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Energy Scaling of Nonlinear Pulse Compression to 10s of fs with Gain-Managed Nonlinear Amplification Using Large Core Fibers and Time-Domain Pulse Combining

Lauren Cooper

This thesis presents a new strategy for scaling gain-managed nonlinear amplification (GMNA) through the use of pulse bursts that are subsequently time-combined using coherent pulse stacking (CPS). While the work here focuses specifically on the integration of GMNA within CPS architectures, this …

Design and Progress Towards a Broadband, High Energy, Multidimensionally Combined Fiber Laser

Mahek Logantha, Tong Zhou, Qiang Du, Fanting Kong et autres

We present the design and progress towards a 200mJ pulse energy, 5kHz rep-rate, 1kW average power, 40fs multidimensionally combined fiber laser for laser-plasma acceleration and broad applications, including overcoming challenges due to broad bandwidth.

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Gain-Managed Nonlinear Amplifier (GMNA) energy scaling to 5µJ in solitary, and to mJ range in bursts of, sub-50fs pulses using a 50µm core LMA fiber

Lauren Cooper, Yu Bai, Thomas Wade Hawkins, Liang Dong et autres

We explore GMNA energy scaling in 50µm core LMA fiber with solitary pulses, experimentally demonstrating 5-8µJ energies in 44-62fs pulses, and with pulse bursts, numerically predicting energy scaling into mJ range with sub-50fs pulses.

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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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Reimagining Methodologies: Why We Center Marginalized Voices

Victoria Siaumau, Yumi Aguilar, Jane Lehr, Lynne A. Slivovsky et autres

San Luis Obispo

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Testing Federated Analytics Across Secure Data Environments Using Differing Statistical Approaches on Cross-Disciplinary Data

Suzy Gallier, Alexander Topham, James A. Hodson, David A. McNulty et autres

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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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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 …

Coherent Temporal Stacking of Tens-of-fs Laser Pulses Towards Plasma Accelerator Applications

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

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FED-NET: Creating the blueprint for a federated network of next generation, cross-council Trusted Research Environments

Professor Elizabeth Sapey, Benjamin Crosby, Professor Philip Quinlan, Tom C. Giles et autres

Solving complex challenges requires data collected for different purposes and from different sources and geographical locations. However, combining data is challenging. There are public concerns about data security/access. Data governance (the legal and ethical framework for data access) is critical. There are …

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Facebook Communities of African Diasporas and Their U.S. Embassies

Hesham Mesbah, Lauren Cooper

This study explores how the Nigerian, Ethiopian, and Egyptian diasporas in the United States use their Facebook groups to create their imagined communities. It also draws a parallel between their use of Facebook and how the embassies of their countries of origin …

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