Bichromatic excitation of the ${R}_{1}$ line in ruby at liquid-helium temperature is considered. The frequency difference of the spectral components of the driving field is resonant with the energy gap between the anticrossed spin sublevels $+1/2$ and $+3/2$ in the ground state ${}^{4}{A}_{2}.$ The condition of the spin coherence trapping in the nonabsorbing state is analyzed. Population trapping is revealed in the reduced spontaneous emission from the excited state and in large spin magnetization of the ground state ${\mathrm{Cr}}^{3+}$ precessing with the frequency difference of the spectral components of the driving field. This magnetization can be detected by a pickup coil. The lifetime of the induced magnetization is strongly dependent on the ratio of the lifetime of the excited state $\ifmmode \bar{E}\else \={E}\fi{}$ and the spin coherence decay time ${(T}_{2}{)}_{\mathrm{spin}}.$ Bichromatic excitation of the ${R}_{1}$ line in ruby at liquid-helium temperature is considered. The frequency difference of the spectral components of the driving field is resonant with the energy gap between the anticrossed spin sublevels $+1/2$ and $+3/2$ in the ground state ${}^{4}{A}_{2}.$ The condition of the spin coherence trapping in the nonabsorbing state is analyzed. Population trapping is revealed in the reduced spontaneous emission from the excited state and in large spin magnetization of the ground state ${\mathrm{Cr}}^{3+}$ precessing with the frequency difference of the spectral components of the driving field. This magnetization can be detected by a pickup coil. The lifetime of the induced magnetization is strongly dependent on the ratio of the lifetime of the excited state $\ifmmode \bar{E}\else \={E}\fi{}$ and the spin coherence decay time ${(T}_{2}{)}_{\mathrm{spin}}.$

Physical Review ASep 15, 20005 citations

Population trapping in ruby

R. N. Shakhmuratov, Alex Szabo, Gregory Kozyreff +3 more

Population trapping in the ground state spin sublevels of Cr 3+ in ruby at liquid helium temperature is considered. It is proposed to excite the R 1 -transition by a bichromatic laser beam with an optical frequency difference matching the ground state spin sublevels splitting. If the excitation is strong enough to decouple Cr 3+ from its environment, responsible for dephasing, an appreciable amount of the population is trapped in a particular superposition of the spin sublevels. This superposition state does not interact with the laser beam because of the destructive interference of the quantum paths constituting the transition. Population trapping can be detected by the reduced luminescence from the excited state and by the magnetization ringing originating from the ground state spin coherence.Population trapping in the ground state spin sublevels of Cr 3+ in ruby at liquid helium temperature is considered. It is proposed to excite the R 1 -transition by a bichromatic laser beam with an optical frequency difference matching the ground state spin sublevels splitting. If the excitation is strong enough to decouple Cr 3+ from its environment, responsible for dephasing, an appreciable amount of the population is trapped in a particular superposition of the spin sublevels. This superposition state does not interact with the laser beam because of the destructive interference of the quantum paths constituting the transition. Population trapping can be detected by the reduced luminescence from the excited state and by the magnetization ringing originating from the ground state spin coherence.

Laser PhysicsJan 1, 20000 citations

Observation of the Optical Analog of the Mössbauer Effect in Ruby

A. Szabó

Physical Review LettersNov 1, 197110 citations

Bichromatic excitation of the

{R}_{1}

line in ruby at liquid-helium temperature is considered. The frequency difference of the spectral components of the driving field is resonant with the energy gap between the anticrossed spin sublevels

+1/2

and

+3/2

in the ground state

{}^{4}{A}_{2}.

The condition of the spin coherence trapping in the nonabsorbing state is analyzed. Population trapping is revealed in the reduced spontaneous emission from the excited state and in large spin magnetization of the ground state

{\mathrm{Cr}}^{3+}

precessing with the frequency difference of the spectral components of the driving field. This magnetization can be detected by a pickup coil. The lifetime of the induced magnetization is strongly dependent on the ratio of the lifetime of the excited state $\ifmmode \bar{E}\else \={E}\fi{}$ and the spin coherence decay time

{(T}_{2}{)}_{\mathrm{spin}}.