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 ${\sim}{100\!\times}$ and the number of high-energy pulses by ${30\!\times}$ 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.

© 2020 Optical Society of America

High-energy pulse-burst laser system for megahertz-rate flow visualization

Pingfan P. Wu and Richard B. Miles
Opt. Lett. 25(22) 1639-1641 (2000)

Narrow-linewidth megahertz-rate pulse-burst laser for high-speed flow diagnostics

Brian Thurow, Naibo Jiang, Mo Samimy, and Walter Lempert
Appl. Opt. 43(26) 5064-5073 (2004)

100-ps-pulse-duration, 100-J burst-mode laser for kHz–MHz flow diagnostics

Sukesh Roy, Joseph D. Miller, Mikhail N. Slipchenko, Paul S. Hsu, Jason G. Mance, Terrence R. Meyer, and James R. Gord
Opt. Lett. 39(22) 6462-6465 (2014)

Megahertz-rate OH planar laser-induced fluorescence imaging in a rotating detonation combustor

Paul S. Hsu, Mikhail N. Slipchenko, Naibo Jiang, Christopher A. Fugger, Austin M. Webb, Venkat Athmanathan, Terrence R. Meyer, and Sukesh Roy
Opt. Lett. 45(20) 5776-5779 (2020)

Burst-mode femtosecond laser electronic excitation tagging for kHz–MHz seedless velocimetry

Jordan M. Fisher, Michael E. Smyser, Mikhail N. Slipchenko, Sukesh Roy, and Terrence R. Meyer
Opt. Lett. 45(2) 335-338 (2020)