TWO-PHOTON ABSORPTION AS A QUENCHING MECHANISM FOR STIMULATED RAMAN SCATTERING OF $5280 {\AA}$ LASER RADIATION
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Date
1966
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Ohio State University
Abstract
Most investigations of stimulated Raman scattering involve the use of giant-pulsed ruby laser radiation $(6943\AA)$. With the exception of $CS_{2}^{1}$ the materials commonly used as scattering samples are free of absorption at wavelengths corresponding to two-photon energies ($\lambda 3470\AA$) of this excitation source. However, when the second harmonic radiation ($\lambda 5300\AA$) of the giant-pulsed neodymium laser is used, two-photon absorption becomes energetically possible for seattering materials such as benzene, and its substituted derivatives, and the alkyl $iodides^{2, 3}$ Theoretical and experimental evidence will be presented which tends to confirm that, for those systems in which the selection rules for two-photon absorption are satisfied, two-photon absorption can occur to such an extent that it completely quenches the SRS process. On the other hand, for some materials which are transparent at $\lambda ^{1}/_{2} (5300\AA)$, e.g., hexane, cyclohexane, acetonitrile, there is evidence that the $5300\AA$ radiation is more efficient than the $6943\AA$ radiation in the production of SRS.
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Author Institution: Electro-Optical Systems Incorporated
This work was supported in part by the Air Force Avionics Laboratory, Research and Technology Division, Air Force Systems Command, U. S. Air Force. $^{1}$ J. A. Giordmaine and J. A. Howe, Phys. Rev. Letters 11, 207 (1963). $^{2}$ M. El-Sayed, F. M. Johnson and J. A. Duardo, J. Chem, Phys., to be published. $^{3}$ J. A. Duardo and F. M. Johnson, J. Chem, Phys., to be published.
This work was supported in part by the Air Force Avionics Laboratory, Research and Technology Division, Air Force Systems Command, U. S. Air Force. $^{1}$ J. A. Giordmaine and J. A. Howe, Phys. Rev. Letters 11, 207 (1963). $^{2}$ M. El-Sayed, F. M. Johnson and J. A. Duardo, J. Chem, Phys., to be published. $^{3}$ J. A. Duardo and F. M. Johnson, J. Chem, Phys., to be published.