Probe spectroscopy in an operating magneto-optical trap: The role of Raman transitions between discrete and continuum atomic states

High Resolution Spectroscopy of Cold, Trapped Atoms

“…Such a shape can be qualitatively understood in terms of a two-level dressed atom model [1] extended to include multilevel structure of rubidium states and inhomogeneities of the net optical field in the trap. The results of such modeling [2] are in a good agreement with the experimental signals. …”

“…In order to model the spectra one also has to include E and B-field inhomogeneities in the trap. However, such a modeling [2], despite its better agreement with experimental signal for δ ≈ 0 still does not provide the exact shape of the absorption curve in its very central part, namely for |δ| < 0.05 Γ . This can only be achieved by including the processes of the momentum exchange between atoms and the laser field, leading to so-called recoil-induced resonances (RIR) [3][4][5][6][7].…”

“…The discrepancy between the simple model and experiment is primarily due to the lack of inclusion of E and B-field inhomogeneities in the trap [2].…”

Opto-mechanical estimation of micro-trap with cold atoms via nonlinear stimulated Raman scattering spectrum

“…In order to estimate the trapping parameters of microtraps, many different methods have been proposed, such as dynamical methods on atomic oscillations [21][22][23], the trap-loss rate method of atomic collisions [24], the free-expansion method by temperature measurement [25] and optical spectroscopic methods via stimulated Raman scattering (SRS) [26][27][28] or recoil induced resonance on atomic velocity [29][30][31]. Because the field-induced microtrap on atom chips is relatively flexible on small scales, above mentioned mechanical methods on this system are difficult to carry out in a high resolution limit.…”

Phase-sensitive imaging of cold atoms at the shot-noise limit

“…Sequences of images can be used to estimate temperature and atomic coherence. 1,2 On the other hand, spectroscopy can be used to derive the frequency dependent absorption and dispersion of a sample, which provides an alternative means to estimate the velocity distribution 3 or frequency shifts 4 through coupling to the environment. Ideally, one would like a technique that could do both simultaneously as one could then explore, e.g., spatial variations of the refractive index of the sample.…”