Conference on Lasers and Electro-Optics

Resonant peak in detuning curve of ionic anti-Stokes Raman laser

Sergey A. Babin, Sergey I. Kablukov, S. Khorev, Evgeniy V. Podivilov, Vladimir V. Potapov, М. Г. Степанов, David A. Shapiro

Published Aug 29, 2005• 0 citations

Publisher

Abstract

Summary form only given. A CW anti-Stokes Raman laser (ASRL) in ionic system enables up-conversion of high efficiency and large frequency shift. In a /spl Lambda/-system, the pump radiation of frequency /spl omega//sub p/ is converted into a Raman laser output of frequency /spl omega/ in the process of resonant interaction with ionic levels. Various schemes in ArII system with a metastable start level n and a short-lived final level l have been studied previously . Here we report on realization of ASRL in ArII system with long-lived final level 4s'/sup 2/D/sub 5/2/ having a lifetime comparable with that for start metastable level 3d'/sup 2/G/sub 9/2/.

DOI: 10.1109/iqec.2000.908179

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Conference on Lasers and Electro-Optics

Resonant peak in detuning curve of ionic anti-Stokes Raman laser

Sergey A. Babin, Sergey I. Kablukov, S. Khorev, Evgeniy V. Podivilov, Vladimir V. Potapov, М. Г. Степанов, David A. Shapiro

Published Aug 29, 2005• 0 citations

Publisher

Abstract

DOI: 10.1109/iqec.2000.908179

Related papers

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Continuous-wave generation of the anti-Stokes Raman laser is demonstrated in the new $\ensuremath{\Lambda}$ scheme

\mathrm{Ar}

II ${3d}^{\ensuremath{'}}{}^{2}{G}_{9/2}\ensuremath{\rightarrow}{4p}^{\ensuremath{'}}{}^{2}{F}_{7/2}\ensuremath{\rightarrow}{4s}^{\ensuremath{'}}{}^{2}{D}_{5/2}$ with quasimetastable initial and final levels. Red pump radiation with wavelength ${\ensuremath{\lambda}}_{p}=611 \mathrm{nm}$ from a dye laser that excites transition ${3d}^{\ensuremath{'}}{}^{2}{G}_{9/2}\ensuremath{\rightarrow}{4p}^{\ensuremath{'}}{}^{2}{F}_{7/2}$ is converted into the blue radiation at $\ensuremath{\lambda}=461 \mathrm{nm}$ ${(4p}^{\ensuremath{'}}{}^{2}{F}_{7/2}\ensuremath{\rightarrow}{4s}^{\ensuremath{'}}{}^{2}{D}_{5/2})$ with efficiency of about

30%.

The tunability range spans more than 20 GHz around exact resonance, which is five times broader than the Doppler contour. The output frequency $\ensuremath{\omega}$ is found to depend linearly on the frequency ${\ensuremath{\omega}}_{p}$ of the pump field: $\ensuremath{\omega}\ensuremath{\simeq}{\ensuremath{\omega}}_{p}{\ensuremath{\lambda}}_{p}/\ensuremath{\lambda}.$ A sharp peak of output power is observed in the spectral profile at the exact resonance instead of the well-known two-photon dip. The model is proposed that includes ionic scattering in plasma and interaction of the running pump and standing output waves. The theory offers an interpretation of the observed peak.

Continuous-wave generation of an anti-Stokes Raman laser on a number of blue-green argon-ion lines (4p-4s and 4p-3d) has been demonstrated with optical pumping from metastable levels

{3\mathrm{d}}^{|\mathrm{I}\mathrm{H}2}

G and

{3\mathrm{d}}^{4}

F. It is found that the population transfer rate is increased by a factor of 3--5 (and hence the output power of the Raman laser) owing to Coulomb diffusion in the velocity space. The excitation and relaxation rates for the metastable level have been measured. The Bennett hole on the metastable level has been recorded using the probe field technique. It has been shown that Coulomb diffusion changes the shape of the contour to an exponential cusplike profile. Its width exceeds the Lorentzian one by 100 times and is close to the Doppler width. Such a giant broadening is also confirmed by the shape of the absorption saturation curve.