High-energy laser pulses for extended duration megahertz-rate flow diagnostics
Abstract
Optical diagnostics of highly dynamic supersonic and hypersonic flows requires laser sources with a combination of high pulse intensities and fast repetition rates. A burst-mode Nd:YAG laser system is presented for increasing the overall energy of 532 nm pulse trains by ∼ 100 × and the number of high-energy pulses by 30 × for extended duration megahertz-rate flow diagnostics. At a lower repetition rate of 100 kHz, unprecedented energies near 1 J/pulse are achieved at 532 nm over a 1.1 ms burst. The laser performance is characterized and demonstrated for megahertz-rate laser-induced breakdown spectroscopy in a Mach 2 turbulent jet.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 12, 2020
- Source ID
- 10.1364/ol.400831
Entities
People
- Erik L. Braun
- Josef Felver
- Mikhail N Slipchenko
- Sukesh Roy
- Terrence R Meyer
Organizations
- Air Force Office of Scientific Research