Multi-frame interferometric imaging with a femtosecond stroboscopic pulse train for observing irreversible phenomena
Abstract
We describe a high-speed single-shot multi-frame interferometric imaging technique enabling multiple interferometric images with femtosecond exposure time over a 50 ns event window to be recorded, following a single laser-induced excitation event. The stroboscopic illumination of a framing camera is made possible through the use of a doubling cavity that produces a femtosecond pulse train that is synchronized to the gated exposure windows of the individual frames of the camera. The imaging system utilizes a Michelson interferometer to extract phase and ultimately displacement information. We demonstrate the method by monitoring laser-induced deformation and the propagation of high-amplitude acoustic waves in a silicon nitride membrane. The method is applicable to a wide range of fast irreversible phenomena such as crack branching, shock-induced material damage, cavitation, and dielectric breakdown.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 01, 2020
- Source ID
- 10.1063/1.5140446
Entities
People
- A. A. Maznev
- D Veysset
- Dmitro Martynowych
- Keith A. Nelson
- Steven E Kooi
- Yuchen Sun
Organizations
- Army Research Office
- Massachusetts Institute of Technology