The linear-perpendicular-linear polarization gradient technique was used for investigating laser collimation of a gallium atomic beam in one dimension. The full angular divergence of the atomic beam was reduced to 0.3 mrad by operating on a particular electron transition at 294.45 nm. The transverse velocity of the atoms was reduced to 11 cm/s, which was about half of the Doppler cooling limit. The one-dimensional kinetic energy of atoms was reduced to 6 neV. The transition state exhibited optical pumping of the atoms by the cooling laser.The linear-perpendicular-linear polarization gradient technique was used for investigating laser collimation of a gallium atomic beam in one dimension. The full angular divergence of the atomic beam was reduced to 0.3 mrad by operating on a particular electron transition at 294.45 nm. The transverse velocity of the atoms was reduced to 11 cm/s, which was about half of the Doppler cooling limit. The one-dimensional kinetic energy of atoms was reduced to 6 neV. The transition state exhibited optical pumping of the atoms by the cooling laser.

APS Four Corners Section Meeting AbstractsNov 1, 20010 citations

Laser cooling of two-level atoms

WORLD SCIENTIFIC eBooksSep 1, 20110 citations

Laser collimation of an atomic gallium beam

Steven J. Rehse, Karen M. Bockel, S. A. Lee

We have laser collimated a gallium atomic beam in one dimension using the linear-perpendicular-linear polarization gradient technique. Operating on the cycling $4{p}^{\phantom{\rule{0.2em}{0ex}}2}{P}_{3∕2}(F=3)\ensuremath{\rightarrow}4{d}^{\phantom{\rule{0.3em}{0ex}}2}{D}_{5∕2}(F=4)$ transition at $294.45\phantom{\rule{0.3em}{0ex}}\text{nm}$ , the full angular divergence of the atomic beam was reduced to $0.3\phantom{\rule{0.3em}{0ex}}\text{mrad}$ , corresponding to a transverse velocity of $\ifmmode\pm\else\textpm\fi{}11\phantom{\rule{0.3em}{0ex}}\text{cm}∕\mathrm{s}$, about one-half the Doppler cooling limit. The dependence of the cooling efficiency on the laser detuning and power was investigated. Optical pumping of the atoms out of the $4{p}^{\phantom{\rule{0.2em}{0ex}}2}{P}_{3∕2}(F=3)$ state by the cooling laser was observed. Repumping schemes were investigated and found to successfully repopulate the cooled $F=3$ hyperfine state.We have laser collimated a gallium atomic beam in one dimension using the linear-perpendicular-linear polarization gradient technique. Operating on the cycling $4{p}^{\phantom{\rule{0.2em}{0ex}}2}{P}_{3∕2}(F=3)\ensuremath{\rightarrow}4{d}^{\phantom{\rule{0.3em}{0ex}}2}{D}_{5∕2}(F=4)$ transition at $294.45\phantom{\rule{0.3em}{0ex}}\text{nm}$, the full angular divergence of the atomic beam was reduced to $0.3\phantom{\rule{0.3em}{0ex}}\text{mrad}$, corresponding to a transverse velocity of $\ifmmode\pm\else\textpm\fi{}11\phantom{\rule{0.3em}{0ex}}\text{cm}∕\mathrm{s}$, about one-half the Doppler cooling limit. The dependence of the cooling efficiency on the laser detuning and power was investigated. Optical pumping of the atoms out of the $4{p}^{\phantom{\rule{0.2em}{0ex}}2}{P}_{3∕2}(F=3)$ state by the cooling laser was observed. Repumping schemes were investigated and found to successfully repopulate the cooled $F=3$ hyperfine state.

Physical Review AJun 7, 200427 citations

Light force manipulation of gallium atoms

Steven J. Rehse, Lee, Siu Au, advisor, Menoni, Carmen, committee member +2 more

We have demonstrated the first one-dimensional laser cooling of neutral gallium atoms. We identified the 4p2P3/2(F=3) → 4d2D5/2(F=4) transition at 294.45 nm as a cycling transition suitable for laser cooling. We developed a frequency stabilized tunable UV laser capable of generating over 90 mW for use at that wavelength. A careful spectroscopy of the hyperfine structure was performed on the 294.45 nm transition. This spectroscopy significantly improved the measurement of the Ga hyperfine constants and corrected existing errors in the literature.We have demonstrated the first one-dimensional laser cooling of neutral gallium atoms. We identified the 4p2P3/2(F=3) → 4d2D5/2(F=4) transition at 294.45 nm as a cycling transition suitable for laser cooling. We developed a frequency stabilized tunable UV laser capable of generating over 90 mW for use at that wavelength. A careful spectroscopy of the hyperfine structure was performed on the 294.45 nm transition. This spectroscopy significantly improved the measurement of the Ga hyperfine constants and corrected existing errors in the literature.

Jan 1, 20021 citation

294.45\phantom{\rule{0.3em}{0ex}}\text{nm}

, the full angular divergence of the atomic beam was reduced to

0.3\phantom{\rule{0.3em}{0ex}}\text{mrad}

, corresponding to a transverse velocity of $\ifmmode\pm\else\textpm\fi{}11\phantom{\rule{0.3em}{0ex}}\text{cm}∕\mathrm{s}$, about one-half the Doppler cooling limit. The dependence of the cooling efficiency on the laser detuning and power was investigated. Optical pumping of the atoms out of the

4{p}^{\phantom{\rule{0.2em}{0ex}}2}{P}_{3∕2}(F=3)

state by the cooling laser was observed. Repumping schemes were investigated and found to successfully repopulate the cooled

F=3

hyperfine state.