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Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q
Jin S Zhang1, Jay D Bass1, Gaohua Zhu2
1Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
The Review of Scientific Instruments
|July 3, 2015
Summary
This study presents a novel laser-heating Brillouin spectroscopy system for high-pressure, high-temperature material analysis. The system enables precise acoustic velocity measurements on materials like water and olivine under extreme conditions.
Area of Science:
- Geophysics
- Materials Science
- Spectroscopy
Background:
- High-pressure and high-temperature research requires advanced analytical techniques.
- Brillouin spectroscopy is a powerful tool for probing acoustic properties of materials.
Purpose of the Study:
- To develop and demonstrate an integrated laser-heating Brillouin spectroscopy system.
- To perform high-pressure acoustic velocity measurements on liquid water, ice, and San Carlos olivine.
Main Methods:
- Integration of CO2 laser-heating with Brillouin and Raman spectroscopy.
- Temperature determination via grey-body thermal radiation, calibrated with a tungsten ribbon lamp.
- High-pressure measurements using a diamond-anvil cell and ruby fluorescence for pressure calibration.
Main Results:
- Acoustic velocities measured on liquid water and ice up to 2500 K at high pressure.
- Brillouin scattering on San Carlos olivine (111) plane at 13 GPa and 1300 K.
- Demonstrated pressure accuracy within ±0.5 GPa using KCl and KBr as pressure-transmitting media.
Conclusions:
- The developed system successfully enables high-pressure, high-temperature Brillouin spectroscopy.
- The variable scattering angle capability allows for wide wave vector (q) probing, crucial for phonon dispersion studies.
- This technique is applicable to complex materials with large unit cells.
