Complications to optical measurements using a laser with an unstable resonator: a case study on laser-induced incandescence of soot

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