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Physical Review A

Ultraviolet light-induced atom desorption for large rubidium and potassium magneto-optical traps (7 pages)

T. Henninger, Tim van Zoest, Carsten Klempt

Published Jan 1, 2006• 4 citations
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Ultraviolet light-induced atom desorption for large rubidium and potassium magneto-optical traps

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We show that light-induced atom desorption (LIAD) can be used as a flexible atomic source for large $^{87}\mathrm{Rb}$ and $^{40}\mathrm{K}$ magneto-optical traps. The use of LIAD at short wavelengths allows for fast switching of the desired vapor pressure and permits experiments with long trapping and coherence times. The wavelength dependence of the LIAD effect for both species was explored in a range from $630\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}253\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ in an uncoated quartz cell and a stainless steel chamber. Only a few $\mathrm{mW}∕{\mathrm{cm}}^{2}$ of near-UV light produce partial pressures that are high enough to saturate a magneto-optical trap at $3.5\ifmmode\times\else\texttimes\fi{}{10}^{9}$ $^{87}\mathrm{Rb}$ atoms or $7\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $^{40}\mathrm{K}$ atoms. Loading rates as high as $1.2\ifmmode\times\else\texttimes\fi{}{10}^{9}$ $^{87}\mathrm{Rb}$ atoms/s and $8\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $^{40}\mathrm{K}$ atoms/s were achieved without the use of a secondary atom source. After the desorption light is turned off, the pressure quickly decays back to equilibrium with a time constant as short as $200\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{s}$, allowing for long trapping lifetimes after the MOT loading phase.

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We show that light-induced atom desorption (LIAD) can be used as a flexible atomic source for large 87Rb^{87}\mathrm{Rb}87Rb and 40K^{40}\mathrm{K}40K magneto-optical traps. The use of LIAD at short wavelengths allows for fast switching of the desired vapor pressure and permits experiments with long trapping and coherence times. The wavelength dependence of the LIAD effect for both species was explored in a range from 630to253nm630\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}253\phantom{\rule{0.3em}{0ex}}\mathrm{nm}630to253nm in an uncoated quartz cell and a stainless steel chamber. Only a few mW∕cm2\mathrm{mW}∕{\mathrm{cm}}^{2}mW∕cm2 of near-UV light produce partial pressures that are high enough to saturate a magneto-optical trap at $3.5\ifmmode\times\else\texttimes\fi{}{10}^{9}$ 87Rb^{87}\mathrm{Rb}87Rb atoms or $7\ifmmode\times\else\texttimes\fi{}{10}^{7}$ 40K^{40}\mathrm{K}40K atoms. Loading rates as high as $1.2\ifmmode\times\else\texttimes\fi{}{10}^{9}$ 87Rb^{87}\mathrm{Rb}87Rb atoms/s and $8\ifmmode\times\else\texttimes\fi{}{10}^{7}$ 40K^{40}\mathrm{K}40K atoms/s were achieved without the use of a secondary atom source. After the desorption light is turned off, the pressure quickly decays back to equilibrium with a time constant as short as $200\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{s}$, allowing for long trapping lifetimes after the MOT loading phase.