Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q. Academic Article uri icon


  • We describe a Brillouin spectroscopy system integrated with CO2 laser-heating and Raman spectroscopic capabilities. Temperature is determined by measurements of the grey-body thermal radiation emitted by the hot sample, with the system response calibrated relative to a standard tungsten ribbon lamp. High-pressure laser-heating Brillouin scattering measurements of acoustic velocities on liquid water and ice compressed in a diamond-anvil cell were performed at temperatures up to 2500 150 K at high pressure. Single-crystal laser-heating Brillouin measurements were made on the (111) plane of San Carlos olivine at 13 GPa, 1300 200 K. The pressure as measured by ruby fluorescence is shown to be within 0.5 GPa of the pressure on the olivine sample during laser heating when KCl and KBr are used as pressure-transmitting media. In addition, the system is designed for continuously variable scattering angles from forward scattering (near 0 scattering angle) up to near back scattering (141). This novel setup allows us to probe a wide range of wave vectors q for investigation of phonon dispersion on, for example, crystals with large unit cells (on the scale of hundreds of nm).

published proceedings

  • Rev Sci Instrum

author list (cited authors)

  • Zhang, J. S., Bass, J. D., & Zhu, G.

citation count

  • 18

complete list of authors

  • Zhang, Jin S||Bass, Jay D||Zhu, Gaohua

publication date

  • June 2015