In order to study the effect of viscosity on bubbles in a cavitating fluid, the properties of laser-induced bubbles and the resulting luminescence pulses are examined for various glycerol-water mixtures over 1-8 bars of pressure. Bubbles are generated by a Nd:YAG laser, with the bubble radius monitored by a laser-beam photodiode system and the luminescence structure measured by fast photomultip...

We present a novel technique to measure time-resolved laser-induced fluorescence signals in plasma sources that have a relatively constant Fourier spectrum of oscillations in steady-state operation, but are not periodically pulsed, e.g., Hall thrusters. The technique uses laser modulation of the order of MHz and recovers signal via a combination of band-pass filtering, phase-sensitive detection...

38 LLE Review, Volume 93 Introduction Single-photon detectors (SPD’s) represent the ultimate sensitivity limit for any quantum radiation detectors. In the visible light range, the best known and most widely used are Si avalanche photodiodes (APD’s)1 and photomultiplier tubes (PMT’s).2 The operation of photomultiplier/avalanche devices is based on the electron cascade and multiplication effect, ...