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Laser frequency offset locking using electromagnetically induced transparency
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DOI：10.1063/1.2734471.png)
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Abstract
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The authors have used an electromagnetically induced transparency resonance in rubidium as a dispersive reference to lock the relative frequency of two lasers to the atomic ground-state hyperfine splitting. The beat frequency between the two lasers directly generates a microwave signal at 3.036 GHz (Rb-85) or 6.835 GHz (Rb-87). High bandwidth (600 kHz) feedback was achieved with only low-frequency (10 MHz) electronics using the frequency modulation sideband method. The spectral width of the microwave beat frequency was reduced to less than 1 kHz. The technique offers a convenient and low-cost method suitable for many topical two-frequency experiments, including coherent population trapping, slow light, lasing without inversion, and Raman sideband cooling. (c) 2007 American Institute of Physics.
Keywords:
DIODE-LASER
MODULATION
ABSORPTION
STABILIZATION
SPECTROSCOPY
PHASE
LINE
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