Measurement Of Two-Photon Absorption Cross Sections In Atomic 0 At 226 nm: Single-Frequency Versus Multimode Lasers

Douglas J Bamford; William K Bischel; Albert P Hickman; Mark J Dyer

doi:10.1117/12.945518

22 June 1988 Measurement Of Two-Photon Absorption Cross Sections In Atomic 0 At 226 nm: Single-Frequency Versus Multimode Lasers

Douglas J Bamford, William K Bischel, Albert P Hickman, Mark J Dyer

Author Affiliations +

Proceedings Volume 0912, Pulse Single-Frequency Lasers: Technology and Applications; (1988) https://doi.org/10.1117/12.945518
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

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 P_2,1_,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.

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Douglas J Bamford, William K Bischel, Albert P Hickman, and Mark J Dyer "Measurement Of Two-Photon Absorption Cross Sections In Atomic 0 At 226 nm: Single-Frequency Versus Multimode Lasers", Proc. SPIE 0912, Pulse Single-Frequency Lasers: Technology and Applications, (22 June 1988); https://doi.org/10.1117/12.945518

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