Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q

Jin S. Zhang, Jay D. Bass, Gaohua Zhu

Research output: Contribution to journalArticle

Abstract

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).

Original languageEnglish (US)
Article number063905
JournalReview of Scientific Instruments
Volume86
Issue number6
DOIs
StatePublished - Jun 1 2015

Fingerprint

Laser heating
laser heating
Single crystals
Spectroscopy
single crystals
Olivine
scattering
olivine
spectroscopy
Scattering
ruby
thermal radiation
forward scattering
Forward scattering
anvils
Brillouin scattering
cells
acoustic velocity
Ruby
ribbons

ASJC Scopus subject areas

  • Instrumentation

Cite this

Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q. / Zhang, Jin S.; Bass, Jay D.; Zhu, Gaohua.

In: Review of Scientific Instruments, Vol. 86, No. 6, 063905, 01.06.2015.

Research output: Contribution to journalArticle

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