The equation of state (EOS) of hydrogen isotopes under extreme conditions is fundamental to planetary science and inertial confinement fusion (ICF), yet experimental constraints across broad thermodynamic regimes remain sparse. We report laser-driven shock measurements on hydrogen and deuterium statically precompressed to record pressures of 5.1 and 6.2 GPa, respectively. By coupling an integrated static-dynamic compression platform with a rigorous precompression-corrected impedance-matching framework, we extract high-precision pressure-density-temperature data up to 158.8 GPa for ${\mathrm{H}}_2$ and 281.9 GPa for ${\mathrm{D}}_2$. These measurements systematically expand the accessible phase space, exhibiting excellent agreement with a wide-range EOS model and establishing stringent benchmarks for modeling giant planetary interiors and ICF plasmas.

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• Compressed hydrogen
• Equations of state
• High-pressure studies
• Plasma fusion
• Shock waves
• Pressure techniques