Time-Synchronized CW Laser-Induced Fluorescence on an Oscillatory Xenon Discharge (Pre Print)
Abstract
A novel approach to time-synchronizing laser-induced fluorescence measurements to an oscillating current in a 60 Hz xenon discharge lamp using a CW laser is presented. A sample-hold circuit is implemented to separate out signals at different phases along a current cycle, and is followed by a lock-in amplifier to pull out the resulting time-synchronized fluorescence trace from the large background signal. The time evolution of lower state population are derived from the changes in intensity of the fluorescence excitation lineshape resulting from laser-induced fluorescence measurements of the 6s'[1/2]01 - 6p'[3/2]2 xenon atomic transition at lambda = 834.68 nm. Results show that the lower state population oscillates at twice the frequency of the discharge current, 120 Hz.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2012
- Accession Number
- ADA613653
Entities
People
- M. A. Cappelli
- N. A. Macdonald
- William A. Hargus
Organizations
- Air Force Research Laboratory