Journal of the Physical Society of Japan

The Indirect Determination of the Cross Section of Stimulated Emission of the F Center in KCl

Hiromasa Hanzawa, Yuzo Mori, Hiroshi Ohkura

Published Dec 15, 1988• 1 citation

Abstract

The intensity of the F center emission in KCl is reduced by simultaneous irradiation of 1.06 µm pulse from an Nd:YAG laser, whose second harmonic pulse is used for the F excitation. The reduction is related to the stimulated emission in the relaxed excited state of the F center. The cross section of the stimulated emission is estimated to be 4.0×10 -17 cm 2 at 80K.

DOI: 10.1143/jpsj.57.4434

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Journal of the Physical Society of Japan

The Indirect Determination of the Cross Section of Stimulated Emission of the F Center in KCl

Hiromasa Hanzawa, Yuzo Mori, Hiroshi Ohkura

Published Dec 15, 1988• 1 citation

Publisher

Abstract

DOI: 10.1143/jpsj.57.4434

Related papers

Two-Color Superfluorescence of O 2 ` − Centers in KCl

R. Florian, L.O. Schwan, D. Schmid

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Experimental Evaluation of the Cross-sectionsand the Quench-sections for the K(4P_J)-N_2,He

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Experimental determination of highly excited F levels in potassium by three-photon absorption spectroscopy

P. Bensoussan

Three-photon absorption spectroscopy allows determination of the $\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ energy levels of alkali metals ($\ensuremath{\Delta}L=+3$). The $3d^{2}D_{\frac{3}{2},\frac{5}{2}}$ levels of KI were selectively excited using a narrow-band dye laser. The $3d^{2}D_{\frac{3}{2},\frac{5}{2}}\ensuremath{\rightarrow}\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ absorption lines were observed in the background spectrum of another dye laser, and the $\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ energy levels were deduced, from $n=10$ to $n=14$ inclusive, with an accuracy better than 0.1 ${\mathrm{cm}}^{\ensuremath{-}1}$. Previously, an experiment was performed for the $7f^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ levels in order to verify the method. Shifts and systematic errors were entirely negligible. For all lines, the relative intensities of the absorbed doublet peaks are in good agreement with the estimates of the $4s^{2}S_{\frac{1}{2}}\ensuremath{\rightarrow}3d^{2}D_{\frac{3}{2},\frac{5}{2}}$ probabilities.Three-photon absorption spectroscopy allows determination of the $\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ energy levels of alkali metals ($\ensuremath{\Delta}L=+3$). The $3d^{2}D_{\frac{3}{2},\frac{5}{2}}$ levels of KI were selectively excited using a narrow-band dye laser. The $3d^{2}D_{\frac{3}{2},\frac{5}{2}}\ensuremath{\rightarrow}\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ absorption lines were observed in the background spectrum of another dye laser, and the $\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ energy levels were deduced, from $n=10$ to $n=14$ inclusive, with an accuracy better than 0.1 ${\mathrm{cm}}^{\ensuremath{-}1}$. Previously, an experiment was performed for the $7f^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ levels in order to verify the method. Shifts and systematic errors were entirely negligible. For all lines, the relative intensities of the absorbed doublet peaks are in good agreement with the estimates of the $4s^{2}S_{\frac{1}{2}}\ensuremath{\rightarrow}3d^{2}D_{\frac{3}{2},\frac{5}{2}}$ probabilities.

Physical Review AJun 1, 197512 citations

Single crystals of KCl containing $\mathrm{O}_{2}^{}{}_{}{}^{\ensuremath{-}}$ centers (8\ifmmode\times\else\texttimes\fi{}

{10}^{16}

-7\ifmmode\times\else\texttimes\fi{}

{10}^{17}

${\mathrm{cm}}^{\ensuremath{-}3}$) were excited at low temperatures (

T<30

K) using frequency-quadrupled single pulses of a mode-locked Nd-doped yttrium aluminum garnet laser. At excitation intensities above 20 GW/

{\mathrm{cm}}^{2}

a spontaneous emission of coherent light was observed which could be identified as Dicke superfluorescence. This superfluorescence was observed on two of the zero-phonon lines in the vibrational progression of the $\mathrm{O}_{2}^{}{}_{}{}^{\ensuremath{-}}$ fluorescence spectrum (0-10 and 0-11 at 592.8 and 629.1 nm, respectively). We have studied the time dependence, the statistics of the delay times, and the intensities. The observed delay times vary between 0.5 and 10 ns, the observed pulse widths between 0.5 and 6 ns, and the coherence time was found to be longer than 100 ps. The observed linewidths of the superfluorescence ($0.016\mathrm{nm}\ensuremath{\cong}14\mathrm{GHz}$) is a factor of 2.5 smaller than that of the spontaneous fluorescence (0.042 nm at 4.2 K). The superfluorescence is observed only below a critical temperature which depends on the $\mathrm{O}_{2}^{}{}_{}{}^{\ensuremath{-}}$ concentration (8 to 28 K for concentrations between 8\ifmmode\times\else\texttimes\fi{}

{10}^{16}

and 7\ifmmode\times\else\texttimes\fi{}

{10}^{17}

${\mathrm{cm}}^{\ensuremath{-}3}$).

Three-photon absorption spectroscopy allows determination of the

\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}

energy levels of alkali metals ($\ensuremath{\Delta}L=+3$). The

3d^{2}D_{\frac{3}{2},\frac{5}{2}}

levels of KI were selectively excited using a narrow-band dye laser. The $3d^{2}D_{\frac{3}{2},\frac{5}{2}}\ensuremath{\rightarrow}\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}$ absorption lines were observed in the background spectrum of another dye laser, and the

\mathrm{nf}^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}

energy levels were deduced, from

n=10

n=14

inclusive, with an accuracy better than 0.1 ${\mathrm{cm}}^{\ensuremath{-}1}$. Previously, an experiment was performed for the

7f^{2}F_{\frac{5}{2},\frac{7}{2}}^{0}

levels in order to verify the method. Shifts and systematic errors were entirely negligible. For all lines, the relative intensities of the absorbed doublet peaks are in good agreement with the estimates of the $4s^{2}S_{\frac{1}{2}}\ensuremath{\rightarrow}3d^{2}D_{\frac{3}{2},\frac{5}{2}}$ probabilities.