Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition
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...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SciPost
2019-04-01
|
| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.6.4.047 |
| _version_ | 1818315677740564480 |
|---|---|
| author | Govind Unnikrishnan, Michael Gröbner, Hanns-Christoph Nägerl |
| author_facet | Govind Unnikrishnan, Michael Gröbner, Hanns-Christoph Nägerl |
| author_sort | Govind Unnikrishnan, Michael Gröbner, Hanns-Christoph Nägerl |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T09:09:20Z |
| format | Article |
| id | doaj.art-8defef17da7147ef9500a95f4649ec95 |
| institution | Directory Open Access Journal |
| issn | 2542-4653 |
| language | English |
| last_indexed | 2024-12-13T09:09:20Z |
| publishDate | 2019-04-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj.art-8defef17da7147ef9500a95f4649ec952022-12-21T23:53:00ZengSciPostSciPost Physics2542-46532019-04-016404710.21468/SciPostPhys.6.4.047Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transitionGovind Unnikrishnan, Michael Gröbner, Hanns-Christoph NägerlWe 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.https://scipost.org/SciPostPhys.6.4.047 |
| spellingShingle | Govind Unnikrishnan, Michael Gröbner, Hanns-Christoph Nägerl Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition SciPost Physics |
| title | Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition |
| title_full | Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition |
| title_fullStr | Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition |
| title_full_unstemmed | Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition |
| title_short | Sub-Doppler laser cooling of $^{39}$K via the 4S$\to$5P transition |
| title_sort | sub doppler laser cooling of 39 k via the 4s to 5p transition |
| url | https://scipost.org/SciPostPhys.6.4.047 |
| work_keys_str_mv | AT govindunnikrishnanmichaelgrobnerhannschristophnagerl subdopplerlasercoolingof39kviathe4sto5ptransition |