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Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition
by Govind Unnikrishnan, Michael Gröbner, Hanns-Christoph Nägerl
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Submission summary
| Authors (as registered SciPost users): | Govind Unnikrishnan |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/1811.02185v3 (pdf) |
| Date accepted: | 2019-03-29 |
| Date submitted: | 2019-03-26 01:00 |
| Submitted by: | Unnikrishnan, Govind |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
We demonstrate sub-Doppler laser cooling of $ ^{39} $K using degenerate Raman sideband cooling via the 4S$_{1/2} \rightarrow $5P$ _{1/2} $ transition at 404.8 nm. By using an optical lattice in combination with a magnetic field and optical pumping beams, we obtain a spin-polarized sample of up to $5.6 \times 10^{7}$ atoms cooled down to a sub-Doppler temperature of 4 $\mu $K, reaching a peak density of $3.9 \times 10^{9}$ atoms/cm$ ^{3} $, a phase-space density greater than $ 10^{-5} $, and an average vibrational level of $ \langle \nu \rangle=0.6 $ in the lattice. This work opens up the possibility of implementing a single-site imaging scheme in a far-detuned optical lattice utilizing shorter wavelength transitions in alkali atoms, thus allowing improved spatial resolution.
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Published as SciPost Phys. 6, 047 (2019)