Open AccessTime-stretched photonic Doppler velocimetry
Author(s) -
Jason Mance,
B. M. La Lone,
Daniel H. Dolan,
Sheri Payne,
Darrell Ramsey,
L. R. Veeser
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.025022
Subject(s) - optics , velocimetry , laser doppler velocimetry , detector , interferometry , doppler effect , bandwidth (computing) , physics , beat (acoustics) , laser , inertial confinement fusion , photonics , acoustics , computer science , telecommunications , medicine , blood flow , astronomy
Inertial confinement fusion facilities generate implosions at speeds greater than 100 km/s, and measuring the material velocities is important and challenging. We have developed a new velocimetry technique that uses time-stretched spectral interferometry to increase the measurable velocity range normally limited by the detector bandwidth. In this approach, the signal is encoded on a chirped laser pulse that is stretched in time to reduce the beat frequency before detection. We demonstrate the technique on an imploding liner experiment at the Sandia National Laboratories' Z machine, where beat frequencies in excess of 50 GHz were measured with 20 GHz bandwidth detection.