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Proceedings Paper

Measurement Of Two-Photon Absorption Cross Sections In Atomic 0 At 226 nm: Single-Frequency Versus Multimode Lasers
Author(s): Douglas J Bamford; William K Bischel; Albert P Hickman; Mark J Dyer
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Paper Abstract

Absolute atomic bound-bound two-photon cross sections have been measured using a single-frequency laser, eliminating the usual uncertainties about unresolved temporal fluctuations. The cross sections were measured using the technique of two-photon excited fluorescence. For the 3p3 P2,1,0+2P3P2 transition in atomic oxygen at 226 nm the integrated cross section (obtained by s6afining the laser frequency through the two-photon resonance) is 1.87 ±0.60 x 10-35 cm4. Relative fine structure cross sections and energy spacings have been measured by Doppler-free spectroscopy. Absolute and relative two-photon cross sections agree well with ab initio calculations. Comparison with similar measurements carried out with multimode lasers yields information about multimode laser photon statistics. The experimental integrated cross section is shown to be proportional to the product of the atomic cross section and G(2)(0) the second-order intensity correlation at time zero of the laser field. It is assumed that G(2)(0)=1.0 for the single-frequency laser source. Five other laser 226 configurations have values of G(2)(0) ranging from 0.8 ±0.2 Until multimode lasers are well enough understood to allow predictions of G"2) (0 (especially after frequency conversion processes such as doubling and Raman shifting), single-frequency lasers will be the best source of reliable multiphoton cross section measurements.

Paper Details

Date Published: 22 June 1988
PDF: 6 pages
Proc. SPIE 0912, Pulse Single-Frequency Lasers: Technology and Applications, (22 June 1988); doi: 10.1117/12.945518
Show Author Affiliations
Douglas J Bamford, SRI International (United States)
William K Bischel, SRI International (United States)
Albert P Hickman, SRI International (United States)
Mark J Dyer, SRI International (United States)

Published in SPIE Proceedings Vol. 0912:
Pulse Single-Frequency Lasers: Technology and Applications
William K. Bischel; Larry A. Rahn, Editor(s)

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