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1	Transducers for measuring acoustic transients Alcock, Robin D. January 1997 (has links) This thesis is concerned with the design and development of measuring devices for the characterisation of acoustic transients with high temporal and spatial resolution. Three new techniques are demonstrated characterising acoustic transients generated by Nd-YAG laser (1060nm, 30ns, 55mJ) assisted breakdown of water and air. The first technique demonstrates the use of a high power semiconductor laser in a high speed multiple exposure imaging system. This system developed is capable of illuminating an event with up to 10 pulses of light at a maximum repetition rate of 5MHz, with a timing accuracy of ≈5ns. Each semiconductor laser light pulse has a FWHM duration of 50ns, peak power of 30W, and a wavelength of 860nm. Images of individual acoustic transients are displayed on the same CCD camera frame, and it was found that this is best achieved using a dark field imaging technique such as Schlieren imaging. 534 Optical cavitation; Shock waves
2	Numerische Untersuchungen zum optischen Durchbruch von Femtosekunden-Laserpulsen in Wasser / Numerical investigations of the optical breakdown of femtosecond laser pulses in water Köhler, Karsten 13 October 2010 (has links) No description available. 530 Physik Mathematics and Computer Science optischer Durchbruch ultrakurze Laserpulse optische Kavitation Plasmaentstehung numerische Berechnungen optical breakdown ultrashort laser pulses optical cavitation plasma formation numerical calculations 33.38 RPE 000: Nichtlineare Optik {Physik}

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Transducers for measuring acoustic transients

Numerische Untersuchungen zum optischen Durchbruch von Femtosekunden-Laserpulsen in Wasser / Numerical investigations of the optical breakdown of femtosecond laser pulses in water