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Λ-enhanced gray molasses cooling (Λ-GMC) technique has been widely used in experiments to prepare cold atomic samples below the sub-doppler temperature limit. To meet the experimental requirements of cavity quantum electrodynamics systems, we designed and constructed a wide-range, fast-tuning laser system by integrating tapered amplifiers, fiber phase modulators, etalon, and injection locking amplification techniques and so on. This laser system achieves a maximum tuning range of 600MHz and a frequency tuning speed of 5ns. Based on this laser system, loading atom in a crossed dipole trap assisted by cesium D2 line Λ-GMC cooling in the center of the optical microcavity is studied, various factors affecting the atom loading are mainly as follows: laser duration τ, three-dimensional magnetic field(Bx,By,Bz), single-photon detuning∆, two-photon detuning δ, ratio of cooling beam power to repumping beam power Icool/Irep, and cooling beam power Icooling. The optimal parameters in this system are:τ=7ms,δ=0.2MHZ,∆=5Γ,Icool/Irep=3,Icool=1.2Isat. Comparing to traditional PGC-assisted loading, the number of atoms is increased by about 4 times, and the atomic temperature is reduced from 25μk to 8μk. This experiment provides important insights for preparing ultracold atomic samples and capturing single atom arrays.
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Keywords:
- Λ-enhanced gray molasses cooling /
- doppler temperature limit /
- wide-range frequency tuning /
- cold atom
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