GHz Frame-Rate Laser Diagnostics of HED Plasmas for 10 Hz LaserNetUS Facilities

Summary

Spectral Energies, LLC is developing a GHz frame-rate laser diagnostic system for high energy density (HED) plasmas, aiming to commercialize a proof-of-concept diagnostic for LaserNetUS facilities. The system is seeded by a 50 MHz laser, generating 100 pJ, 4 ps pulses stretched to 1.1 ns, then split into eight spectrally and temporally distinct replicas with 1 ns spacing, totaling 15 nJ. These are amplified to 0.157 mJ, frequency-doubled to 532 nm (70 nJ), and deliver 10 Hz GHz imaging bursts. Initial validation demonstrated ~2 µm spatial resolution, but tests at SCARLET encountered issues with EMP and limited pump energy (7 mJ max for imaging), with final tests scheduled for Dec 2024 to Jan 2025.

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