Measurements of temperature and spring constant in a magneto-optical trap

An Asymmetric Magneto-Optical Trap

“…(4a) with the normalized saturation intensities s 0 = I z /I s and s 0 = I z /(I s ) av , respectively. Here (I s ) av = 3.78 mW/cm 2 is the averaged saturation intensity (Wallace et al, 1994). With the averaged saturation intensity, the result agrees well with experimental results.…”

“…Since the spring constant is one of the basic parameters of a MOT, there has been much effort to measure the spring constant, inferred from the measured spatial profile and the temperature by means of the equi-partition theorem (Drewsen et al, 1994;Wallace et al, 1994), by using the beam imbalance (Wallace et al, 1994;Steane et al, 1992) or by using the imposed oscillating magnetic field (Kohns et al, 1993;Hope et al, 1993). Authors in Ref.…”

“…16(a), it is similar to the conventional six-beam MOT, except that the detunings (δ x and δ y ) and intensities (I x and I y ) of the transverse lasers can be different from those of the longitudinal ones (δ z and I z ). In the case of usual MOT, one obtains a usual Doppler trap superimposed with a tightly confined SDT at the MOT center, exhibiting bimodal velocity as well as spatial distributions (Dalibard, 1988;Townsend et al, 1995;Drewsen et al, 1994;Wallace et al, 1994;. Under equal detunings but unequal intensities (I x , I y I z ), which typically arise in the nonlinear dynamics study of nonadiabatically driven MOT (Kim et al, 2003;, one still obtains the bimodal distribution.…”

“…In addition, there have been intensive studies on the MOT itself such as cold collisions (Walker & Feng, 1994), nonlinear optics (Tabosa et al, 1991), existence of sub-Doppler force (Wallace et al, 1994), or limit of density (Townsend et al, 1995). Nevertheless MOT itself is far from quantitative understanding and still keeps providing surprises as unexplored characteristics and applications are being developed.…”

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.…”