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Brillouin scattering spectroscopy for a laser heated diamond anvil cell
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Image of FIG. 1.
FIG. 1.

Sketch of the in situ high Brillouin scattering system. Part of the system is double-sided laser heating system. -CCD and -CCD refer to spectrograph for pressure (Raman) measurements and temperature measurements, respectively. The optics contained in the Brillouin scattering system include M9, M12, M13, M8, L4, L7, and L9. M12 is a 50/50 beamsplitter used to split the laser beam into two branches. One branch passes through M13 and focused by L9 onto DAC for 60° geometry scattering, the other branch passes through L7, and M8 and focused by L4 onto DAC for backscattering geometry. The scattered light is collected by L4, and L8 and treated by the six-pass tandem Fabry-Perot interferometer.

Image of FIG. 2.
FIG. 2.

The planform (left) and side view (right) of diamond anvil cell coated with a heat insulator layer of and metallic heat absorber layer of Au. The Au film was photolithographed into circularity on which the heating laser with a spot size of was focused; meanwhile the exciting laser was focused exactly on sample through the center of the ring for Brillouin scattering measurements.

Image of FIG. 3.
FIG. 3.

Brillouin spectrum of water under pressure (a) and during laser heating process (b). Backscattering geometry was used and the longitudinal sound velocity was measured. refers to Rayleigh peak. Brillouin peaks on the left and right sides of Rayleigh peak belong to Stokes (S) and anti-Stokes (AS) components, respectively. (b) The first spectrum from the bottom was taken in the solid ice. In the second spectrum from the bottom, the peak became broad and split into several peaks, which indicated that the ice VII began to melt when temperature was raised to . The other spectra were taken in the liquid water at different temperatures.


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Scitation: Brillouin scattering spectroscopy for a laser heated diamond anvil cell