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Two-dimensional pump–probe imaging in reacting flows

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Abstract

We demonstrate that picosecond pump–probe spectroscopy can be used to acquire quantitative two-dimensional images of species in flames, using a loss-modulation-based two-dimensional phase-sensitive detection system mounted in front of a CCD camera. This system is currently limited to detection of 1% modulation depth, but it can be significantly improved. The instrument permits high data collection rates, and it provides a quenching-independent signal without the need for calibration. The signal is embedded in a coherent laser beam, making it possible to perform optical processing before the camera.

© 1995 Optical Society of America

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