Abstract
We report the temporal intensity correlation (TIC) of scattered photons (SPs) generated via a two-photon transition in a Doppler-broadened warm atomic vapor of the 5S1/2 − 5P3/2 − 5D5/2 transition of 87Rb atoms. Through the investigation of the TICs of the SPs obtained via both one- and two-photon transitions, the second-order correlation values g(2)(0) (i.e., at zero time delay) of both SPs were measured as approximately 1.75, respectively. The widths of the g(2)(τ) spectra were measured as 26 ns (corresponding to the natural lifetime of the 5P3/2 state) for the one-photon transition and 1.8 ns (corresponding to the Doppler width of the warm atomic vapor) for the two-photon transition. We confirmed that the coherence time of the SPs can vary in accordance with the photons emitted from the one- or two-photon transitions in the ladder-type atomic system. The correlated SPs obtained via the two-photon transition contributed to almost all the velocity classes of the atoms in the Doppler-broadened atomic ensemble.
Highlights
Light is understood in terms of fundamental concepts related to both the wave property and particle property, such as optical coherence and photon statistics, respectively[1]
The most popular photon-pair source is the correlated photon pairs generated via the spontaneous parametric down-conversion (SPDC) process in χ(2) nonlinear crystals[33,34,35]
We experimentally demonstrated the temporal intensity correlation (TIC) of bunched light from a warm atomic vapor obtained via a ladder-type two-photon transition, i.e., the 5S1/2 − 5P3/2 − 5D5/2 transition of 87Rb
Summary
Light is understood in terms of fundamental concepts related to both the wave property and particle property, such as optical coherence and photon statistics, respectively[1]. In the photon context, thermal light is understood as a bunching of photons and examined in terms of the temporal statistical properties of those photons. The second-order temporal correlation of the fluorescence from various atomic media has been definitively observed as photon bunching at zero time delay, the spectral features in that case are dependent on the characteristics of the atomic media, such as multiscattering, Doppler broadening, and homogenous effects[8,9,10,11,12,13,14]. We investigate the temporal statistical properties of these two kinds of scattered photons (SPs), i.e., those resulting from one- and two-photon transitions, from a Doppler-broadened warm atomic vapor, and from the 5S1/2 − 5P3/2 − 5D5/2 transition of 87Rb atoms. The spectral features of the TIC are elucidated by examining the two-photon resonance contributions from almost all the atomic velocity groups in the Doppler-broadened ladder-type atomic system
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