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Advances in generation of high-repetition-rate burst mode laser output

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Abstract

It is demonstrated that the incorporation of variable pulse duration flashlamp power supplies into an Nd:YAG burst mode laser system results in very substantial increases in the realizable energy per pulse, the total pulse train length, and uniformity of the intensity envelope. As an example, trains of 20 pulses at burst frequencies of 50 and 20kHz are demonstrated with individual pulse energy at 1064nm of 220 and 400mJ, respectively. Conversion efficiency to the second- (532nm) and third- (355nm) harmonic wavelengths of 50% and 35–40%, respectively, is also achieved. Use of the third-harmonic output of the burst mode laser as a pump source for a simple, home built optical parametric oscillator (OPO) produces pulse trains of broadly wavelength tunable output. Sum-frequency mixing of OPO signal output at 622nm with residual output from the 355nm pump beam is shown to produce uniform bursts of tunable output at 226nm, with individual pulse energy of 0.5mJ. Time-correlated NO planar laser induced fluorescence (PLIF) image sequences are obtained in a Mach 3 wind tunnel at 500kHz, representing, to our knowledge, the first demonstration of NO PLIF imaging at repetition rates exceeding tens of hertz.

© 2008 Optical Society of America

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