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Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5026429· OSTI ID:1540191
 [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); DOE/OSTI
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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.

Research Organization:
Krell Institute, Ames, IA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002135
OSTI ID:
1540191
Alternate ID(s):
OSTI ID: 1441020
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 21 Vol. 123; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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