Performances of a VIPA-based spectrometer for Brillouin scattering experiments in the diamond anvil cell under laser heating

A. Forestier (1, 2) , G. Weck (1, 2) , Frédéric Datchi (3) , P. Loubeyre (1, 2)

1 DAM/DIF - DAM Île-de-France
2 LMCE - Laboratoire Matière sous Conditions Extrêmes
3 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie

VIPA-based Brillouin spectroscopy is implemented for in-situ measurements at high pressure and temperature in laser-heated diamond anvil cells. Its performances are compared to those of the widely used Tandem Fabry–Perot instrument. A significant reduction of the collection time is in particular enabled. The usefulness of VIPA-Brillouin spectroscopy for High Pressure studies is here illustrated by revisiting the nitrogen melting curve up to 45 GPa. VIPA-Brillouin spectroscopy has the potential to become an important platform to investigate the equation of state properties of warm dense molecular systems.

Mots clés: High pressure; Brillouin scattering; VIPA; Laser heating; Diamond anvil cell; Nitrogen; Melting

Domaines: Matière Condensée [cond-mat]

A. Forestier, G. Weck, Frédéric Datchi, P. Loubeyre. Performances of a VIPA-based spectrometer for Brillouin scattering experiments in the diamond anvil cell under laser heating. High Pressure Research, 2022, 42 (3), pp.259-277. ⟨10.1080/08957959.2022.2109968⟩. ⟨hal-03866581⟩