Time-resolved, dual heterodyne phase collection transient grating spectroscopy
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Department of Nuclear Science and Engineering
The application of optical heterodyne detection for transient grating spectroscopy (TGS) using a fixed, binary phase mask often relies on taking the difference between signals captured at multiple heterodyne phases. To date, this has been accomplished by manually controlling the heterodyne phase between measurements with an optical flat. In this letter, an optical configuration is presented which allows for collection of TGS measurements at two heterodyne phases concurrently through the use of two independently phase controlled interrogation paths. This arrangement allows for complete, heterodyne amplified TGS measurements to be made in a manner not constrained by a mechanical actuation time. Measurements are instead constrained only by the desired signal-to-noise ratio. A temporal resolution of between 1 and 10 s, demonstrated here on single crystal metallic samples, will allow TGS experiments to be used as an in-situ, time-resolved monitoring technique for many material processing applications.
- Research Organization:
- Krell Institute, Ames, IA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0002135
- OSTI ID:
- 1426152
- Journal Information:
- Applied Physics Letters, Vol. 110, Issue 21; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Thermal diffusivity determination using heterodyne phase insensitive transient grating spectroscopy
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journal | June 2018 |
A thermal study of amorphous and textured carbon and carbon nitride thin films via transient grating spectroscopy
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journal | April 2018 |
Non-contact, non-destructive mapping of thermal diffusivity and surface acoustic wave speed using transient grating spectroscopy | text | January 2020 |
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