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Physical review. B, Condensed matter

Spectroscopic properties of P13 and P03 excited states of Bi3+ ions in germanate glass

G. Boulon, B. Moine, J.C. Bourcet

Published Aug 1, 1980• 42 citations

Abstract

Laser-induced-fluorescence-band-narrowing and time-resolved-spectroscopy techniques are extended to measure the inequivalent sites in the spectroscopic properties of $^{3}P_{1}$ and $^{3}P_{0}$ excited states of the ${\mathrm{Bi}}^{3+}$ ion in germanate glass. Under excitation of the $^{3}P_{1}$ components, at 4 K, the analysis of the $^{3}P_{0}\ensuremath{\rightarrow}^{1}S_{0}$ unsplit fluorescence band is particularly useful to probe the large site-to-site variations in the glass. The spectral dependence of the lifetime, the temporal evolution of the bandwidth under laser excitation, the red shift of both $^{3}P_{1}\ensuremath{\rightleftarrows}^{1}S_{0}$ and $^{3}P_{0}\ensuremath{\rightarrow}^{1}S_{0}$ transitions and the strong intensity of the forbidden $^{3}P_{0}\ensuremath{\rightarrow}^{1}S_{0}$ transition are discussed. These experiments measure, indeed, the degree of inhomogeneity of ${\mathrm{Bi}}^{3+}$-doped germanate with a broadband ion for the first time.

DOI: 10.1103/physrevb.22.1163

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Physical Review Letters•Oct 13, 1975•62 citations

Laser-induced-fluorescence-band-narrowing and time-resolved-spectroscopy techniques are extended to measure the inequivalent sites in the spectroscopic properties of

^{3}P_{1}

and

^{3}P_{0}

excited states of the

{\mathrm{Bi}}^{3+}

ion in germanate glass. Under excitation of the

^{3}P_{1}

components, at 4 K, the analysis of the

^{3}P_{0}\ensuremath{\rightarrow}^{1}S_{0}

unsplit fluorescence band is particularly useful to probe the large site-to-site variations in the glass. The spectral dependence of the lifetime, the temporal evolution of the bandwidth under laser excitation, the red shift of both

^{3}P_{1}\ensuremath{\rightleftarrows}^{1}S_{0}

and

^{3}P_{0}\ensuremath{\rightarrow}^{1}S_{0}

transitions and the strong intensity of the forbidden

^{3}P_{0}\ensuremath{\rightarrow}^{1}S_{0}

transition are discussed. These experiments measure, indeed, the degree of inhomogeneity of

{\mathrm{Bi}}^{3+}

-doped germanate with a broadband ion for the first time.

We performed laser spectroscopy of

{\mathrm{In}}^{+}

ions stored in a radio-frequency trap. The 5

{\mathit{s}}^{2}

^{1}

{\mathit{S}}_{0}

\ensuremath{\rightarrow}5s5p

^{3}

{\mathit{P}}_{1}

transition at 230.6 nm was excited and its hyperfine splitting and isotope shift have been measured. The lifetime of the

^{3}

{\mathit{P}}_{1}

state was measured using intensity modulated laser excitation: \ensuremath{\tau}

{(}^{3}

{\mathit{P}}_{1}

)=0.44(4) \ensuremath{\mu}s. A single indium ion was laser cooled using this intercombination line and dark periods in the fluorescence were observed when the metastable

^{3}

{\mathit{P}}_{0}

state was populated by a magnetic dipole decay from

^{3}

{\mathit{P}}_{1}

. The radiative lifetime of the forbidden transition

^{3}

{\mathit{P}}_{0}

${\ensuremath{\rightarrow}}^{1}$

{\mathit{S}}_{0}

was determined from the duration of the dark periods: \ensuremath{\tau}

{(}^{3}

{\mathit{P}}_{0}

)=0.14(2) s. This value is compared to calculations based on perturbation theory. Prospects for an optical frequency standard using the narrow 5

{\mathit{s}}^{2}

^{1}

{\mathit{S}}_{0}

\ensuremath{\rightarrow}5s5p

^{3}

{\mathit{P}}_{0}

resonance at 236.5 nm of a single laser-cooled indium ion are discussed.

We performed laser spectroscopy of

{\mathrm{In}}^{+}

ions stored in a radio-frequency trap. The 5

{\mathit{s}}^{2}

^{1}

{\mathit{S}}_{0}

\ensuremath{\rightarrow}5s5p

^{3}

{\mathit{P}}_{1}

transition at 230.6 nm was excited and its hyperfine splitting and isotope shift have been measured. The lifetime of the

^{3}

{\mathit{P}}_{1}

state was measured using intensity modulated laser excitation: \ensuremath{\tau}

{(}^{3}

{\mathit{P}}_{1}

)=0.44(4) \ensuremath{\mu}s. A single indium ion was laser cooled using this intercombination line and dark periods in the fluorescence were observed when the metastable

^{3}

{\mathit{P}}_{0}

state was populated by a magnetic dipole decay from

^{3}

{\mathit{P}}_{1}

. The radiative lifetime of the forbidden transition

^{3}

{\mathit{P}}_{0}

${\ensuremath{\rightarrow}}^{1}$

{\mathit{S}}_{0}

was determined from the duration of the dark periods: \ensuremath{\tau}

{(}^{3}

{\mathit{P}}_{0}

)=0.14(2) s. This value is compared to calculations based on perturbation theory. Prospects for an optical frequency standard using the narrow 5

{\mathit{s}}^{2}

{(}^{3}

{\mathit{S}}_{0}

\ensuremath{\rightarrow}5s5p

^{3}

{\mathit{P}}_{0}

resonance at 236.5 nm of a single laser-cooled indium ion are discussed.

Laser-induced fluorescence line narrowing has been observed for the first time in a nonresonantly excited rare-earth system. Excitation with the 4727-\AA{}

{A}^{+}

line into the

^{4}G_{\frac{11}{2}}

level of

{\mathrm{Nd}}^{3+}

in glass results in narrowing of transitions from the

^{4}F_{\frac{3}{2}}

to both the

^{4}I_{\frac{9}{2}}

ground manifold and the

^{4}I_{\frac{11}{2}}

excited manifold. The concentration dependence of the line narrowing provides information regarding resonant ion-ion energy transfer within the inhomogeneously broadened system.

We report the direct observation of energy migration and spectral diffusion in the

^{3}P_{0}

state of La

{\mathrm{F}}_{3}

:

{\mathrm{Pr}}^{3+}

using the technique of time-resolved fluorescence line narrowing on the resonant $^{3}P_{0}\ensuremath{\rightarrow}^{3}H_{4}$ transition. The temperature dependence of the migration process has been measured and various possible transfer mechanisms are discussed. In addition a variation in the excited-state lifetime as a function of absorption frequency and a concentration broadening at zero delay in the nonresonant transition $^{3}P_{0}\ensuremath{\rightarrow}{(^{3}H_{6})}_{1}$ (the lowest Stark level) are reported.