Brillouin Spectroscopy on Earth's mantle mantle with a VIPA-Based Interferometer in Diamond Anvil Cells
POSTER
Abstract
Brillouin spectroscopy is a powerful tool for measuring acoustic wave frequencies in materials under extreme conditions, providing sound velocities and elastic moduli up to tens of gigapascals. Traditionally, a Tandem Fabry–Perot (TFP) interferometer—based on synchronized scanning of two Fabry–Perot etalons—has been used to isolate the small (1–200 GHz) Brillouin shift from much more intense elastically scattered light. However, its long acquisition times (minutes to hours) limit rapid exploration of high-pressure phases and temperature-induced transitions.
We report on the performance of a Virtually Imaged Phased Array (VIPA) spectrometer integrated with a diamond anvil cell (DAC). Unlike the TFP, the VIPA simultaneously records the entire Brillouin spectrum with a two-dimensional pixel array. In test experiments, a high-quality spectrum can be acquired in about ten seconds, enabling near real-time monitoring of thermally induced phase transitions and transient events. We compare TFP and VIPA spectra on the same sample to quantify the VIPA’s performance gains.
The VIPA-based approach promises to shorten experimental timescales, enabling measurement of the full elastic tensor from ambient to mantle-relevant conditions in a single day while capturing rapid changes in elastic properties across dynamic phase boundaries.
We report on the performance of a Virtually Imaged Phased Array (VIPA) spectrometer integrated with a diamond anvil cell (DAC). Unlike the TFP, the VIPA simultaneously records the entire Brillouin spectrum with a two-dimensional pixel array. In test experiments, a high-quality spectrum can be acquired in about ten seconds, enabling near real-time monitoring of thermally induced phase transitions and transient events. We compare TFP and VIPA spectra on the same sample to quantify the VIPA’s performance gains.
The VIPA-based approach promises to shorten experimental timescales, enabling measurement of the full elastic tensor from ambient to mantle-relevant conditions in a single day while capturing rapid changes in elastic properties across dynamic phase boundaries.
Presenters
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Jonathan Dolinschi
University of Oxford, Department of Earth Sciences, University of Oxford, S Parks Rd, Oxford OX1 3AN, UK
Authors
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Jonathan Dolinschi
University of Oxford, Department of Earth Sciences, University of Oxford, S Parks Rd, Oxford OX1 3AN, UK
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Britany Kulka
University of Oxford, Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK., Department of Earth Sciences, University of Oxford, S Parks Rd, Oxford OX1 3AN, UK, School of Earth and Space Exploration, Arizona State University, Tempe, AZ, US
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Hauke Marquardt
Department of Earth Sciences, University of Oxford, S Parks Rd, Oxford OX1 3AN, UK