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WORLD SCIENTIFIC eBooks

Simplified atom trap by using direct microwave modulation of a diode laser

Christopher J. Myatt, Nathan R. Newbury, Carl Wieman

Published Jan 1, 2008• 0 citations
Publisher
DOI
10.1142/9789812813787_0045

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Simplified atom trap by using direct microwave modulation of a diode laser

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We have demonstrated microwave modulation of a diode laser which is operated with optical feedback from a diffraction grating. By directly modulating the diode laser current at frequencies up to 6.8 GHz, we observed 2-30% of the laser power in a single sideband for 20mW of microwave power. Using such a diode laser modulated at 6.6GHz, we have trapped {sup 87}Rb in a vapor cell. With 10mW of microwave power, the number of trapped atoms was only 15% smaller than the number obtained using two lasers in the conventional manner. A microwave modulated diode laser should also be useful for driving stimulated Raman transitions between the hyperfine levels of Rb or Cs.

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We demonstrate direct microwave modulation of diode lasers operated with optical feedback from a diffraction grating. We obtain substantial fractions of the laser power (2–30%) in a single sideband at frequencies as high 6.8 GHz with 20 mW of microwave power and simple inefficient microwave coupling. Using a single diode as modulated at 6.6 GHz, we trapped 87Rb atoms in a vapor cell. With only 10 mW of microwave power we laser trapped 85% as many atoms as were obtained by using two lasers in the conventional manner.
We have demonstrated microwave modulation of a diode laser which is operated with optical feedback from a diffraction grating. By directly modulating the diode laser current at frequencies up to 6.8 GHz, we observed 2-30% of the laser power in a single sideband for 20mW of microwave power. Using such a diode laser modulated at 6.6GHz, we have trapped {sup 87}Rb in a vapor cell. With 10mW of microwave power, the number of trapped atoms was only 15% smaller than the number obtained using two lasers in the conventional manner. A microwave modulated diode laser should also be useful for driving stimulated Raman transitions between the hyperfine levels of Rb or Cs.