Two-photon echo method to determine the transverse relaxation time of excitonic molecules

T. Takagahara

doi:10.1016/0038-1098(81)91131-5

Two-photon echo method to determine the transverse relaxation time of excitonic molecules

T. Takagahara

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

A nonlinear optical method to determine the transverse relaxation time of excitonic molecules by means of two-photon echo is proposed. In the case of two-photon transition such as excitonic molecule one needs three pulses to obtain an echo signal. When the wave-vector and frequency of the three successive pulses are denoted by k₁,ω₁, k₂,ω₂ and k₃,ω₃, the two-photon echo can be observed in the direction of 4k₂-2k₁-k₃ with frequency 4ω₂-2ω₁-ω₃. Tuning both ω₁ and ω₂ to be two-photon resonant with excitonic molecule, we can satisfy the phase-matching condition rather easily for appropriate values of ω₃ due to the large dispersion of excitonic polaritons. From the correlation trace of the two-photon echo we can determine directly the transverse relaxation time of excitonic molecules.

Original language	English
Pages (from-to)	179-182
Number of pages	4
Journal	Solid State Communications
Volume	38
Issue number	3
DOIs	https://doi.org/10.1016/0038-1098(81)91131-5
Publication status	Published - 1981 Apr
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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10.1016/0038-1098(81)91131-5

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Takagahara, T. (1981). Two-photon echo method to determine the transverse relaxation time of excitonic molecules. Solid State Communications, 38(3), 179-182. https://doi.org/10.1016/0038-1098(81)91131-5

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abstract = "A nonlinear optical method to determine the transverse relaxation time of excitonic molecules by means of two-photon echo is proposed. In the case of two-photon transition such as excitonic molecule one needs three pulses to obtain an echo signal. When the wave-vector and frequency of the three successive pulses are denoted by k1,ω1, k2,ω2 and k3,ω3, the two-photon echo can be observed in the direction of 4k2-2k1-k3 with frequency 4ω2-2ω1-ω3. Tuning both ω1 and ω2 to be two-photon resonant with excitonic molecule, we can satisfy the phase-matching condition rather easily for appropriate values of ω3 due to the large dispersion of excitonic polaritons. From the correlation trace of the two-photon echo we can determine directly the transverse relaxation time of excitonic molecules.",

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AB - A nonlinear optical method to determine the transverse relaxation time of excitonic molecules by means of two-photon echo is proposed. In the case of two-photon transition such as excitonic molecule one needs three pulses to obtain an echo signal. When the wave-vector and frequency of the three successive pulses are denoted by k1,ω1, k2,ω2 and k3,ω3, the two-photon echo can be observed in the direction of 4k2-2k1-k3 with frequency 4ω2-2ω1-ω3. Tuning both ω1 and ω2 to be two-photon resonant with excitonic molecule, we can satisfy the phase-matching condition rather easily for appropriate values of ω3 due to the large dispersion of excitonic polaritons. From the correlation trace of the two-photon echo we can determine directly the transverse relaxation time of excitonic molecules.

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