Time-resolved, dual heterodyne phase collection transient grating spectroscopy
Author(s)Dennett, Cody Andrew; Short, Michael P
MetadataShow full item record
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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Applied Physics Letters
American Institute of Physics (AIP)
Dennett, Cody A., and Michael P. Short. “Time-Resolved, Dual Heterodyne Phase Collection Transient Grating Spectroscopy.” Applied Physics Letters 110, no. 21 (May 22, 2017): 211106.
Final published version