Refractive indices of Gd_3Ga_5O_(12) single crystals under shock compression to 100-290 GPa

摘要

Refractive indices of [111] Gd_3Ga_5O_(12) single crystals under shock compression are investigated with planar impact and high-speed laser velocimetry, in the pressure range of 100-290 GPa. The refractive index, n, at 1550 nm is obtained as a function of shock pressure or density (ρ). n increases as pressure increases from 106 GPa to 201 GPa, and then drops sharply as a result of shock-induced melting; the n - ρ relation is linear for the high pressure solid phase. We also establish the true particle velocity-apparent velocity relation for velocity correction.