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Stopping Atoms with Diode Lasers (With 2 Figures)

Richard N. Watts, Carl Wieman

Published Jan 1, 1985• 0 citations
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Stopping Atoms with Diode Lasers

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La température limite d'un jet atomique de césium ralenti par diode laser

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The velocity distribution ofcesium atoms decelmated by a laser diode is measwed using a dye lasm with a narrow spectral width. The "stopped atoms" density is four times greatm than that ofthe free atomic beam at maximum of the Doppler distribution. The average quadratic velocity of these stopped atoms is 3 m/s, and is much lower than the width of the velocity class resonant with the lasm diode (25 m/s). The cooling observed is in good agreement with the simple theoretical mode1 presented in this Note. The possibility of using a "three-frequency" diode is also demonstrated.

•Jan 1, 1988•0 citations

The Diode Laser Manipulation Of Cesium Atoms (polarization, Stopping).

Richard N. Watts

The results of two experiments involving the rapid frequency modulation of diode lasers are presented. In the first experiment, a cesium beam of 10('14) atoms/sec is produced with more than 98% of the atoms in a single spin state. The beam is polarized by optically pumping it with a single diode laser whose frequency is switched between the 6s(F = 4)-6p(,3/2)(F = 5) and 6s(F = 3)-6p(,3/2)(F = 4) transitions at 100 kHz. To do this, the frequency response of a diode laser to changes in injection current was first determined and the injection current modified to force a jump of 9.2 GHz in 1.5 (mu)sec. The same laser is used to probe the atomic population distribution simultaneously. In the second experiment, two diode lasers, tuned to the 6s(F = 4)-6p(,3/2)(F = 5) and 6s(F = 3)-6p(,3/2)(F = 4) transitions, are used to cool and stop a beam of cesium atoms. The laser frequencies are swept to keep them in resonance with the slowing atoms. The same lasers are used to probe the resulting velocity distribution. More than 10('10) atoms/sec are slowed to a velocity of 0 (+OR-) 15 m/sec, corresponding to a temperature of 1(DEGREES)K. Both of these experiments demonstrate extremely simple and inexpensive ways to manipulate atomic cesium.

•Jan 1, 1986•0 citations

Cooling and trapping atoms using diode lasers (A)

Carl E. Weiman

Journal of the Optical Society of America A•Jan 1, 1987•0 citations
The velocity distribution ofcesium atoms decelmated by a laser diode is measwed using a dye lasm with a narrow spectral width. The "stopped atoms" density is four times greatm than that ofthe free atomic beam at maximum of the Doppler distribution. The average quadratic velocity of these stopped atoms is 3 m/s, and is much lower than the width of the velocity class resonant with the lasm diode (25 m/s). The cooling observed is in good agreement with the simple theoretical mode1 presented in this Note. The possibility of using a "three-frequency" diode is also demonstrated.
The results of two experiments involving the rapid frequency modulation of diode lasers are presented. In the first experiment, a cesium beam of 10('14) atoms/sec is produced with more than 98% of the atoms in a single spin state. The beam is polarized by optically pumping it with a single diode laser whose frequency is switched between the 6s(F = 4)-6p(,3/2)(F = 5) and 6s(F = 3)-6p(,3/2)(F = 4) transitions at 100 kHz. To do this, the frequency response of a diode laser to changes in injection current was first determined and the injection current modified to force a jump of 9.2 GHz in 1.5 (mu)sec. The same laser is used to probe the atomic population distribution simultaneously. In the second experiment, two diode lasers, tuned to the 6s(F = 4)-6p(,3/2)(F = 5) and 6s(F = 3)-6p(,3/2)(F = 4) transitions, are used to cool and stop a beam of cesium atoms. The laser frequencies are swept to keep them in resonance with the slowing atoms. The same lasers are used to probe the resulting velocity distribution. More than 10('10) atoms/sec are slowed to a velocity of 0 (+OR-) 15 m/sec, corresponding to a temperature of 1(DEGREES)K. Both of these experiments demonstrate extremely simple and inexpensive ways to manipulate atomic cesium.