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

ABSTRACT

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.

KEYWORDS:

• Brillouin scattering
• VIPA
• laser heating
• diamond anvil cell
• nitrogen
• melting

Acknowledgments

The authors acknowledge Keevin Beneut for his help and the use of the spectroscopy platform of IMPMC.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors acknowledge the Agence Nationale de la Recherche for financial support under Grant n ANR-21-CE30-0032-01 (LILI).