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arXiv · 2608.20645

Gas Beam Dump and Power Meter for High Energy Lasers

Harsha Rajesh·Sida Cao·Ke Ou·Devdigvijay Singh·Pierre Michel·Matthew R. Edwards
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Abstract

Gaseous optics exhibit substantially higher laser-induced-damage thresholds than solid materials, enabling high-intensity operation without permanent degradation. In this Letter, we describe a gas-based beam dump and power meter that exploits the strong absorption of ozone in the Hartley band (200-320 nm). We develop and experimentally validate a model for ozone absorption that predicts the propagation length required for complete energy deposition and the resulting gas temperature rise. By calibrating the temperature rise against incident pulse energy, we demonstrate accurate millijoule-scale pulse energy measurements with an all-gas absorber. These results establish gas-phase absorbers as a scalable, debris-free platform for high-damage-threshold beam dumps and energy diagnostics for high-fluence lasers.

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Harsha Rajesh, Sida Cao, Ke Ou, Devdigvijay Singh, Pierre Michel, Matthew R. Edwards. 2026-08-21. Gas Beam Dump and Power Meter for High Energy Lasers. https://arxiv.org/abs/2608.20645

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