100 kHz thousand-frame burst-mode planar imaging in turbulent flames

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2014-01-01
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Venkateswaran, Prabhakar
Miller, Joseph
Slipchenko, Mikhail
Gord, James
Roy, Sukesh
Meyer, Terrence
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Michael, James
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Mechanical Engineering
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High-repetition-rate, burst-mode lasers can achieve higher energies per pulse compared with continuously pulsed systems, but the relatively few number of laser pulses in each burst has limited the temporal dynamic range of measurements in unsteady flames. A fivefold increase in the range of timescales that can be resolved by burst-mode laser-based imaging systems is reported in this work by extending a hybrid diode- and flashlamp-pumped Nd:YAG-based amplifier system to nearly 1000 pulses at 100 kHz during a 10 ms burst. This enables an unprecedented burst-mode temporal dynamic range to capture turbulent fluctuations from 0.1 to 50 kHz in flames of practical interest. High pulse intensity enables efficient conversion to the ultraviolet for planar laser-induced fluorescence imaging of nascent formaldehyde and other potential flame radicals.

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This article is published as Michael, James B., Prabhakar Venkateswaran, Joseph D. Miller, Mikhail N. Slipchenko, James R. Gord, Sukesh Roy, and Terrence R. Meyer. "100 kHz thousand-frame burst-mode planar imaging in turbulent flames." Optics Letters 39, no. 4 (2014): 739-742. DOI: 10.1364/OL.39.000739.

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