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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Spectro-spatial coherent control of ultrafast laser interaction with atomic vapor

Woojun Lee, Hyosub Kim, Kyungtae Kim, Jaewook Ahn

Published Aug 1, 2015• 0 citations
Publisher

Abstract

Spectro-spatial coherent control methods are reported demonstrating optimized resonant two-photon transitions of rubidium atomic vapor by counter-propagating ultrashort pulse pairs. By properly programming the spectral sign changes across resonance frequencies, unlike non-resonant two-photon transitions, the resonant two-photon transitions probabilities could be enhanced, experiment finds.

DOI
10.1109/cleopr.2015.7376437

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Spectro-spatial coherent control methods are reported demonstrating optimized resonant two-photon transitions of rubidium atomic vapor by counter-propagating ultrashort pulse pairs. By properly programming the spectral sign changes across resonance frequencies, unlike non-resonant two-photon transitions, the resonant two-photon transitions probabilities could be enhanced, experiment finds.
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The spatial coherent control of resonant two-photon transitions in atomic rubidium using counter-propagating ultra-short laser pulses is investigated in this work. There are two transition pathways involved in the spatial excitation pattern. A special pulse shaping scheme is designed to distinguish their individual contribution. The scheme consists of a n-step function flipping at the poles and zeros of the transition amplitude function and two segmented linear function with different slopes, and it can make the desired transition pathway dominate at the assigned spatial position. The simulations show that our scheme is quite effective compared to the previous single linear shaping scheme.
We have investigated multiphoton-ionization passages of rubidium atoms initiated from the excited 5P3/25{P}_{3/2}5P3/2​ energy state. For this we used coherent control schemes based on femtosecond laser pulse shaping applied to cold atoms spatially isolated in a magneto-optical trap. With programed laser pulses of spectral $\ensuremath{\pi}$-phase step, of which location was varied within the laser spectrum, the sequential two-photon-ionization passage along the 5P3/25{P}_{3/2}5P3/2​-5D5D5D continuum was probed in terms of trap-loss spectroscopy. The coherent control two-photon-ionization method unveiled not only the resonantly enhanced two-photon ionization but also the asymmetric nature of the ionization profile structure given as a function of the spectral phase step location. Experimental results show good agreement with the second-order perturbation calculation of the constituent possible ionization passages.
We present a method that harnesses coherent control capability to two-dimensional Fourier-transform optical spectroscopy. For this, three ultrashort laser pulses are individually shaped to prepare and control the quantum interference involved in two-photon interexcited-state transitions of a V\mathsf{V}V-type quantum system. In experiments performed with atomic rubidium, quantum control for the enhancement and reduction of the 5PPP${}_{1/2}\ensuremath{\rightarrow}$ 5PPP3/2{}_{3/2}3/2​ transition was successfully tested in which the engineered transitions were distinguishably extracted in the presence of dominant one-photon transitions.
We demonstrate the ultrafast coherent control of a nonlinear two-photon absorption in a dynamically shifted energy level structure. We use a spectrotemporal laser-pulse shaping that is programed to preserve the resonant absorption condition during the intense laser-field interaction. Experiments carried out in the strong-field regime of two-photon absorption in the ground state of atomic cesium reveal that the analytically obtained offset and curvature of a laser spectrum compensate the effect of both static and dynamic energy shifts of the given light-atom interaction.