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Dispersion and absorption study of two-photon transition in cascade three-level system by ultrafast modulation spectroscopy (in Chinese)

Xiaotao Mi, Zhangping Yu, Qinghua Jiang, Xihua Li, Peng‐Yan Fu

Published Jan 1, 1998• 0 citations
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STUDY OF THE PHOTON ECHO IN UMSCTS

ZHANG YAN-PENG, Zhu Jing-Ping, TANG TIAN-TONG +2 more

We have studied the photon echo in ultrafast modulation spectroscopy in a cascade three-level system (UMSCTS).When the pump beams have broadband linewidth,the one-photon and two-photon four-wave mixings are related to the three-pulse stimulated photon echo and sum-frenquency three-level echo when τ＞0,respectively;while the result should coincide with the case that the beams have narrow linewidth when τ＜0.

Acta Physica Sinica•Jan 1, 1998•0 citations
Based on the polarization interference between one-photon and two-photon processes, we demonstrated an ultrafast modulation spectroscopy in a cascade three-level system (UMSCTS) in Na vapor, which showed a modulation of the four-wave mixing signal intensity with a 55-fs period, corresponding to the beating between the resonant frequencies of the transitions from 3S1/2{\mathit{S}}_{1/2}S1/2​ to 3P3/2{\mathit{P}}_{3/2}P3/2​ and from 3P3/2{\mathit{P}}_{3/2}P3/2​ to 4D3/2,5/2{\mathit{D}}_{3/2,5/2}D3/2,5/2​. We have also discussed the possibility of using UMSCTS to measure the energy levels of the excited states with Doppler-free precision.
We study theoretically ultrafast modulation spectroscopy in Doppler-broadened cascading three-level and four-level systems. The pump beams consist of two frequency components that drive two-pathway excitation. The four-wave mixing (FWM) signal exhibits damping oscillation as the relative time delay τ between the two pump beams is varied, from which the resonant frequencies between energy levels can be deduced. Furthermore, Doppler-free precision in the measurement of the resonant frequencies can be achieved when the pump beams have either narrow-band or broadband linewidths. We study two-photon resonant FWM induced by time-delayed correlated fluctuating fields in a Doppler-broadened cascading three-level system. It is related intrinsically to the sum-frequency trilevel echo when the pump beams have broadband linewidths. However, unlike the corresponding incoherent-light stimulated photon echo, the maximum of the FWM signal is shifted from τ≃0. If we consider the fluctuations of the pump beams, the FWM signal exhibits damping oscillation when the laser frequency is off resonant from the two-photon transition.