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5 December 1977 Single-Atom Detection By One-Photon And Two-Photon Sonres
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Saturated Optical Nonresonance Emission Spectroscopy (SONRES) has been applied to metallic vapor detection. Using one-photon cw excitation less than 0. 2 atoms of sodium have been detected in the laser interaction volume with an ambient pressure environment. The method has been applied to the ultraviolet transitions of nickel and platinum using pulsed excitation sources, achieving detection limits less than 100 atoms in the detection volume for an ambient pressure high temperature environment. Resonance enhanced two-photon excitation has also been investigated for atomic detection applications. Experiments demonstrate that the two-photon method can be expected to achieve ultimate detection limits of 10-3 atoms in the laser interaction volume, approaching the theoretical limit of the one-photon SONRES method. The two-photon method provides optimum performance at low pressure and furnishes the sub-Doppler resolution required for highly selective isotope analysis.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. A. Gelbwachs, C. F. Klein, and J. E. Wessel "Single-Atom Detection By One-Photon And Two-Photon Sonres", Proc. SPIE 0113, Advances in Laser Spectroscopy I, (5 December 1977);

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