Abstract

Laser-induced plasma spectroscopy (LIPS) is a laser-based sensitive optical diagnostic technique to detect a wide variety of atomic and molecular species. We have used the fundamental wavelength along with frequency doubled and quadrupled wavelengths from a Q-switched Nd:YAG laser to produce plasma in an aerosol spray under one-Atmosphere pressure conditions. The experiments were performed using 1064,532, and 266 nm wavelengths independently to understand the effects of wavelength on the generation of plasma and the detection of aerosol particles. A constant-output atomizer was used to create aerosol particles of a median diameter of 0.3 μm at a constant generation rate of 2 × 106 particles/cm3. The optical emissions from Hg and Cr are recorded using an intensified charge-coupled detector (ICCD) coupled with a 50-cm spectrograph. Temporal information is obtained by delaying and gating of the detector after the laser plasma has been created in the probe volume as shown in Fig. 1.

© 1999 Optical Society of America

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