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Complications to Optical Measurements Using a Laser with an Unstable Resonator: A Case Study on Laser-Induced Incandescence of Soot

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Abstract

Temporal behavior of pulses from a Q-switched Nd:YAG laser with an unstable resonator can vary significantly with radial position in the beam. Our laser provides pulses with position-dependent durations spanning 8–11.5 ns at 1064 nm and 7–10 ns at 532 nm. Pulses emerge first and have the longest duration at the center of the beam; they are shorter (by up to 4 ns) and increasingly delayed (by up to 10 ns) with increasing radial distance from the center. This behavior can have a dramatic effect on time-sensitive experiments, such as laser-induced incandescence of soot, if not taken into account.

© 2008 Optical Society of America

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