Anomalous rate of free-induction decay

Boscaino, R.; Bella, V. M. La

doi:10.1103/physreva.41.5171

Cited by 25 publications

(55 citation statements)

References 42 publications

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“…(13) is capable of accounting for the power dependence of G FID experimentally measured in magnetic resonance systems [4]. Here we point out that in the high-power limit when u 10 and u 20 are larger than ͑x 0 T 2 ͒ 21 and ͑x 0 T 1 ͒ 21 , the decay rate Eq.…”

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confidence: 74%

“…+ d Conventional Bloch equations (CBE) are a fundamental starting point for describing the resonance effects of the atom-field interaction, including lasing, coherent spectroscopy, and pulse propagation in resonant dense media. Therefore the experimental indications of CBE failure in the description of coherent transients [1][2][3][4][5][6] and hole burning [7] in solids with inhomogeneous absorption spectra stimulated a widespread theoretical interest [8][9][10][11][12][13][14][15][16][17][18][19][20] (the list is not exhausted).…”

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confidence: 99%

“…Indirect measurement of the hole width via free induction decay (FID) [1][2][3][4][5] and direct measurement by the pump-probe pulse train [7] revealed that the hole burnt in the inhomogeneous spectrum by a long pulse is much narrower than CBE predict. In fact, according to the CBE, the half width at half maximum (HWHM) of the hole equals ϳx p T 1 ͞T 2 in the strong saturation ͑x 2 T 1 T 2 ¿ 1͒ limit, where x is the Rabi frequency, T 2 is the dephasing time, and T 1 is the relaxation time of the population difference.…”

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confidence: 99%

“…We show that the two noise components influence to a different extent both T 1 and T 2 relaxation processes. The theoretical results are compared to experiments on FID [4] and TN [21].…”

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confidence: 99%

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Non-Bloch Transients in Solids: Free Induction Decay and Transient Nutations

1997

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Free induction decay and transient nutations are investigated in a system of two-level particles with an inhomogeneously broadened spectrum. The influence of the x (real) and y (imaginary) parts of the complex amplitude of the noise, induced by the driving field in the sample, is considered. It is shown that both noises affect T 1 and T 2 relaxation processes. When field-noise contributions to 1͞T 2 and 1͞T 1 relaxation rates are dominant and equal to each other, Bloch's saturation is changed to Redfield's saturation. This effect also accelerates transient nutation decay. Comparison with experimentally observed free induction decay and transient nutation in color centers in quartz is discussed.[S0031-9007(97)04230-0]

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confidence: 74%

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confidence: 99%

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confidence: 99%

“…We show that the two noise components influence to a different extent both T 1 and T 2 relaxation processes. The theoretical results are compared to experiments on FID [4] and TN [21].…”

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confidence: 99%

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Non-Bloch Transients in Solids: Free Induction Decay and Transient Nutations

1997

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“…24 These experiments stimulated researchers to consider generalizations to the standard optical Bloch equations. [25][26][27][28][29][30][31][32][33][34][35][36] In this paper it will be shown that many of these treatments correspond to a certain limit of the GBE.…”

Section: Introductionmentioning

confidence: 99%

On the relaxation of a two-level system driven by a strong electromagnetic field

Geva

Kosloff

Skinner

1995

The Journal of Chemical Physics

132

123

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Green's functions and optical line shapes of a general twolevel system in the strong electronic coupling limit A detailed and unified account of the theory of the generalized Bloch equations is presented. The equations apply to a two-level system weakly coupled to a heat bath and subject to a monochromatic rotating field of arbitrary intensity. The relaxation tensor obtained is explicitly field-dependent. The derivation is valid for general coupling to a quantum heat bath. The generalized Bloch equations are shown to be thermodynamically consistent, as opposed to the standard Bloch equations. Different limits of the generalized Bloch equations are examined and related to previous studies. The potential use of the generalized Bloch equations as a probe of the bath spectral density is demonstrated for the case of a two-level system embedded in a Debye solid.

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