By Alexander J. Dunning
This paintings unites the suggestions of laser cooling and matter-wave interferometry to improve an interferometric laser cooling approach in an experimental procedure of chilly rubidium atoms. Serving as an creation to graduate point coherent optical atomic manipulation, the thesis describes the speculation of inspired Raman transitions and atom interferometry, in addition to the experimental equipment for getting ready and manipulating chilly atoms, earlier than construction on those foundations to discover adapted optical pulse sequences and novel atomic cooling techniques.
Interferometric cooling, initially proposed by way of Weitz and Hänsch in 2000, is predicated upon the coherent broadband laser pulses of Ramsey interferometry and in precept permits laser cooling of atomic and molecular species outdoor the scope of conventional Doppler laser cooling. at the direction towards cooling, composite pulses – quantum blunders correction equipment, constructed by means of chemists to mitigate the consequences of in homogeneities in NMR spectroscopy – are investigated on the way to enhancing the functionality of atom interferometers.
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Extra info for Coherent Atomic Manipulation and Cooling: Interferometric Laser Cooling and Composite Pulses for Atom Interferometry
This is known as the cooling transition, and to this we tune our cooling laser. We detune from resonance by δ L (typically 1−3 ) in order to allow for Doppler cooling. e. not coupled by the cooling laser) lower level |5S1/2 , F = 2 is possible. 1 This quickly re-populates |5S1/2 , F = 3 via spontaneous emission from the upper level. The levels discussed above are depicted in Fig. 1. We also include in Fig. 1 the depump laser which, whilst not at all necessary for magneto-optical trapping, is an important component in Chap.
62 as (a) |F,m F ,|F ,m F q =− describe the polarisation of the electric field, in order to eE a (−1)q −q J , F , m F |rq |J, F, m F . 66) in which k and q depend on the properties of the operator and the term in parentheses is a Wigner 3–j symbol , with a constant of proportionality α , F T k α, F , known as the reduced matrix element. 67) in which the term in braces is a Wigner 6–j symbol. Since it is a vector, the position operator rˆ has rank k = 1, hence by applying the Wigner-Eckart theorem to Eq.
Each ECDL con1A repump laser resonant with the |5P3/2 , F = 2 upper state would also be suitable. 42 3 Rubidium MOT and Experimental Procedures Fig. 1 Optical transitions in 85 Rb used in the experiments. The cooling and repump transitions are used for magneto optical trapping, the depump transition is used for optical depumping into F = 2. The solid arrows indicate absorption routes, whilst the dashed arrows indicate the associated spontaneous emission routes. The colour-associations in this diagram are applied consistently in the remainder of this chapter sists of a Sharp GH07895A6C laser diode (nominally 785 nm but can be tuned to 780 nm) and an 1800 lines/mm Edmund Optics holographic grating in the Littrow configuration.