Optical superradiance in a Pr<sup>3+</sup>:LaF<sub>3</sub>crystal

Zuikov, V. A.; Калачев, А. А.; Самарцев, В. В.; Shegeda, A. M.

doi:10.1070/qe2000v030n07abeh001779

Cited by 9 publications

(14 citation statements)

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“…This effect was predicted in paper [7] and observed experimentally [8]. If the spectral line, on which the photon echo is formed, is broad for the first exciting pulse and narrow for the second one, then the temporal shape of the photon echo pulse reproduces the temporal shape of the first exciting pulse reversed in time.…”

Section: Introductionmentioning

confidence: 68%

Photon echoes in strong magnetic fields

Решетов

Yevseyev

2004

Laser Phys. Lett.

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The polarization properties of photon echoes in strong magnetic field, when the action of this field during the time of propagation of the exciting pulses and the echo signal through the resonant gaseous medium cannot be neglected, are studied theoretically. The photon echo polarization in strong magnetic field cannot be described by the polarization vector but rather by the polarization matrix. The degree of the photon echo polarization decreases with the increase of the magnetic field strength. The dependence of the photon echo intensity on the magnetic field strength was also analyzed numerically. In strong magnetic field the fast oscillations of this intensity appear to be damping and modulated by the slower ones. The spectrum of these oscillations depend also on the spectra of the exciting pulses, so that in case of small area of the first exciting pulse its temporal shape may be reconstructed from the oscillations of the echo intensity versus the magnetic field strength. The degree of the photon echo polarization versus magnetic field strength

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Section: Introductionmentioning

confidence: 68%

Photon echoes in strong magnetic fields

Решетов

Yevseyev

2004

Laser Phys. Lett.

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“…This means that if, in the case of cooling with SR, we save the internal quantum efficiency equal to one in the case of traditional cooling with anti-Stokes fluorescence, the value of W mp can be increased considerably as one can see in Eq. (13). That is, in the case of cooling with SR, we can use new hosts with considerably higher maximum phonon energy than traditional hosts used for cooling with anti-Stokes fluorescence saving the value of the internal quantum efficiency, η.…”

Section: Resultsmentioning

confidence: 99%

“…12 In 1999, SR was observed in a RE doped crystal, Pr 3+ :LaF 3 , for the first time. 13 To lower the SR threshold, this crystal was cooled down to 2.2 K to compensate for the low ions concentration in the sample, as will be shown later.…”

Section: Theoretical Analysismentioning

confidence: 99%

Alternative technique for laser cooling with superradiance

Nemova¹,

Kashyap²

2011

Phys. Rev. A

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We present a new theoretical scheme for laser cooling of rare earth doped solids with optical super-radiance (SR), which is the coherent, sharply directed spontaneous emission of photons by a system of laser excited rare earth ions in the solid state host (glass or crystal). We consider an Yb 3+ doped ZBLAN sample pumped at the wavelength 1015 nm with a rectangular pulsed source with a power of ~433W and duration of 10ns. The intensity of the SR is proportional to the square of the number of excited ions. This unique feature of SR permits a dramatic increase in the rate of the cooling process in comparison with the traditional laser cooling of the rare earth doped solids with anti-Stokes spontaneous incoherent radiation (fluorescence). This scheme overcomes the limitation of using only low phonon energy hosts for laser cooling. PACS number (s): 78.20.N, 78.20.Bh, 78.55.Hx

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“…The coherence time of Zeeman or hyperfine states of the ground level may reach 6 hours [71]. The above extraordinary properties render the crystals doped with rare-earth ions to be very prospective systems from the viewpoint of solid-state optical memory and fully optical data processing [72], as well as for the observation of coherent optical effects (in particular, superradiance) [14,15,56,[73][74][75][76][77][78][79].…”

Section: Promising Systemsmentioning

confidence: 99%

Cooperative emission from an ensemble of three-level Λ radiators in a cavity: An insight from the viewpoint of dynamics of nonlinear systems

Рыжов

Vasil'ev

Kosova

et al. 2017

J. Exp. Theor. Phys.

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Cooperative radiation emitted by an ensemble of three-level optical systems with a doublet in the ground state (Λ scheme), which is placed into a cyclic cavity, is studied theoretically. In contrast to the twolevel model of emitters, this process with such a configuration of operating transitions may occur without population inversion in the whole, if the doublet is prepared at the initial instant in a superposition (coherent) state. In the ideal case of a Hamilton system, in which the cavity losses and relaxation in the radiator ensemble are disregarded, the conservation laws are derived, which allow a substantial reduction of the dimension of the phase space of the model (ℝ 11 → ℝ 5 ) and the application of methods of dynamics of nonlinear systems for analyzing the three-level superradiance under these conditions. The possibility of different (both quasiperiodic and chaotic) scenarios of the three-level superradiance is demonstrated on the basis of Poincaré's mappings. Global bifurcation of the system upon a transition from the conventional superradiance regime to inversionless one is revealed. The effects of cavity losses, as well as homogeneous and inhomogeneous broadening in the system of radiators on the regularities found are also discussed.

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Optical superradiance in a Pr³⁺:LaF₃crystal

Cited by 9 publications

References 1 publication

Photon echoes in strong magnetic fields

Photon echoes in strong magnetic fields

Alternative technique for laser cooling with superradiance

Cooperative emission from an ensemble of three-level Λ radiators in a cavity: An insight from the viewpoint of dynamics of nonlinear systems

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Optical superradiance in a Pr3+:LaF3crystal

Cited by 9 publications

References 1 publication

Photon echoes in strong magnetic fields

Photon echoes in strong magnetic fields

Alternative technique for laser cooling with superradiance

Cooperative emission from an ensemble of three-level Λ radiators in a cavity: An insight from the viewpoint of dynamics of nonlinear systems

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Optical superradiance in a Pr³⁺:LaF₃crystal