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Title: Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy

Abstract

The elastic and thermal transport properties of opaque materials may be measured using transient grating spectroscopy (TGS) by inducing and monitoring periodic excitations in both reflectivity and surface displacement. The “phase grating” response encodes both properties of interest, but complicates quantitative analysis by convolving temperature dynamics with surface displacement dynamics. Hence, thermal transport characteristics are normally determined using the “amplitude grating” response to isolate the surface temperature dynamics. Yet, this signal character requires absolute heterodyne phase calibration and contains no elastic property information. Here, a method is developed by which phase grating TGS measurements may be consistently analyzed to determine thermal diffusivity with no prior knowledge of the expected properties. To demonstrate this ability, the wavelength-dependent 1D effective thermal diffusivity of pure germanium is measured using this type of response and found to be consistent with theoretical predictions made by solving the Boltzmann transport equation. This ability to determine the elastic and thermal properties from a single set of TGS measurements will be particularly advantageous for new in situ implementations of the technique being used to study dynamic materials systems.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Krell Institute, Ames, IA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1540191
Alternate Identifier(s):
OSTI ID: 1441020
Grant/Contract Number:  
NA0002135
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 21; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

Citation Formats

Dennett, Cody A., and Short, Michael P. Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy. United States: N. p., 2018. Web. doi:10.1063/1.5026429.
Dennett, Cody A., & Short, Michael P. Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy. United States. doi:10.1063/1.5026429.
Dennett, Cody A., and Short, Michael P. Wed . "Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy". United States. doi:10.1063/1.5026429. https://www.osti.gov/servlets/purl/1540191.
@article{osti_1540191,
title = {Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy},
author = {Dennett, Cody A. and Short, Michael P.},
abstractNote = {The elastic and thermal transport properties of opaque materials may be measured using transient grating spectroscopy (TGS) by inducing and monitoring periodic excitations in both reflectivity and surface displacement. The “phase grating” response encodes both properties of interest, but complicates quantitative analysis by convolving temperature dynamics with surface displacement dynamics. Hence, thermal transport characteristics are normally determined using the “amplitude grating” response to isolate the surface temperature dynamics. Yet, this signal character requires absolute heterodyne phase calibration and contains no elastic property information. Here, a method is developed by which phase grating TGS measurements may be consistently analyzed to determine thermal diffusivity with no prior knowledge of the expected properties. To demonstrate this ability, the wavelength-dependent 1D effective thermal diffusivity of pure germanium is measured using this type of response and found to be consistent with theoretical predictions made by solving the Boltzmann transport equation. This ability to determine the elastic and thermal properties from a single set of TGS measurements will be particularly advantageous for new in situ implementations of the technique being used to study dynamic materials systems.},
doi = {10.1063/1.5026429},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 21,
volume = 123,
place = {United States},
year = {2018},
month = {6}
}

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