Optics Letters

Effects of magnetic fields on four-wave mixing processes in atomic vapors

Nicholas P. Economou, Richard R. Freeman, Gary C. Bjorklund

Published Dec 1, 1978• 12 citations

Abstract

We have observed the effects of magnetic fields on four-wave mixing processes in atomic vapors. We have studied coherent vacuum-ultraviolet generation in Sr vapor via the process omega(1) + omega(2) + omega(3) ? omega(4) in fields of up to 50 kG. Magnetic tuning of the resonances of the third-order nonlinear susceptibility X((3)) was used to modify the dependence of the sum-frequency output power on the generated wavelength.

DOI: 10.1364/ol.3.000209

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Applied Physics LettersSep 1, 197732 citations

Optics Letters

Effects of magnetic fields on four-wave mixing processes in atomic vapors

Nicholas P. Economou, Richard R. Freeman, Gary C. Bjorklund

Published Dec 1, 1978• 12 citations

Publisher

Abstract

DOI: 10.1364/ol.3.000209

Related papers

Generation of cw VUV coherent radiation by four-wave sum frequency mixing in Sr vapor

Richard R. Freeman, Gary C. Bjorklund, Nicholas P. Economou +2 more

Applied Physics LettersOct 15, 197838 citations

Magnetic-field-induced two-colour frequency mixing in atoms: polarization effects on a double-resonance cross section

K V Khalev, Vitalii D Ovsiannikov

Application of a steady magnetic field allows sum-frequency radiation generated via dipole-forbidden mixing of two-colour fields in an atomic medium to be emitted in the (otherwise forbidden) forward direction. As a result of resonance tuning at low-field strength (not exceeding 0.1 T) a fourth-order magnetic-dipole-induced amplitude for the sum-frequency process can be made comparable to the third-order field-free amplitude. We show that the interference between different terms of the field-dependent amplitude may cause the circular dichroism of the forward-scattering cross section for one of the two incident waves or the sum-frequency wave when the other two waves are linearly polarized. The dichroism effect is due to the dissipation processes determined by the resonant level width Γ and depends strongly both on Γ and the resonance detuning Δ. The effect may be used to control the frequency conversion process or to make possible a frequency mixing laser spectroscopy of excited atomic levels.Application of a steady magnetic field allows sum-frequency radiation generated via dipole-forbidden mixing of two-colour fields in an atomic medium to be emitted in the (otherwise forbidden) forward direction. As a result of resonance tuning at low-field strength (not exceeding 0.1 T) a fourth-order magnetic-dipole-induced amplitude for the sum-frequency process can be made comparable to the third-order field-free amplitude. We show that the interference between different terms of the field-dependent amplitude may cause the circular dichroism of the forward-scattering cross section for one of the two incident waves or the sum-frequency wave when the other two waves are linearly polarized. The dichroism effect is due to the dissipation processes determined by the resonant level width Γ and depends strongly both on Γ and the resonance detuning Δ. The effect may be used to control the frequency conversion process or to make possible a frequency mixing laser spectroscopy of excited atomic levels.

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Two tunable dye lasers have been used to generate coherent radiation at a tunable sum frequency in the vacuum-ultraviolet spectral region. Spectral ranges of \ensuremath{\sim}3500 ${\mathrm{cm}}^{\ensuremath{-}1}$ around 1895 \AA{} and \ensuremath{\sim}1200 ${\mathrm{cm}}^{\ensuremath{-}1}$ around 1798 \AA{} have been covered. These ranges may easily be extended. Large (\ensuremath{\sim}\ifmmode\times\else\texttimes\fi{} ${10}^{4}$ ) enhancements of $2{\ensuremath{\nu}}_{1}+{\ensuremath{\nu}}_{2}$ sum mixing are seen when $2{\ensuremath{\nu}}_{1}$ is tuned to a double-quantum allowed transition from the ground state in Sr vapor.Two tunable dye lasers have been used to generate coherent radiation at a tunable sum frequency in the vacuum-ultraviolet spectral region. Spectral ranges of \ensuremath{\sim}3500 ${\mathrm{cm}}^{\ensuremath{-}1}$ around 1895 \AA{} and \ensuremath{\sim}1200 ${\mathrm{cm}}^{\ensuremath{-}1}$ around 1798 \AA{} have been covered. These ranges may easily be extended. Large (\ensuremath{\sim}\ifmmode\times\else\texttimes\fi{}${10}^{4}$) enhancements of $2{\ensuremath{\nu}}_{1}+{\ensuremath{\nu}}_{2}$ sum mixing are seen when $2{\ensuremath{\nu}}_{1}$ is tuned to a double-quantum allowed transition from the ground state in Sr vapor.

Physical Review LettersFeb 18, 1974256 citations

Enhanced production of coherent vuv radiation by four-wave mixing in Sr vapor

Gary C. Bjorklund, John E. Bjorkholm, Richard R. Freeman +1 more

Applied Physics LettersSep 1, 197732 citations

We report on an ac-Stark-effect-enhanced wave-mixing experiment in

{\mathrm{I}}_{2}

vapor in which an output uv signal at frequency 2${\ensuremath{\omega}}_{1}$+${\ensuremath{\omega}}_{2}$ is maximized when the input frequencies ${\ensuremath{\omega}}_{1}$ and ${\ensuremath{\omega}}_{2}$ are both detuned in the same direction from the resonance frequencies of the free molecule. A theory based on a configuration interaction between the ``dressed molecular levels'' is presented to explain the strong enhancement of the uv signal under these conditions. The data presented demonstrate that tunable coherent radiation at ultraviolet and vacuum-ultraviolet frequencies can be generated by the wave-mixing process we describe.

{10}^{4}

) enhancements of $2{\ensuremath{\nu}}_{1}+{\ensuremath{\nu}}_{2}$ sum mixing are seen when $2{\ensuremath{\nu}}_{1}$ is tuned to a double-quantum allowed transition from the ground state in Sr vapor.