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(Color online) Setup for time-domain measurements. An electro-optic-modulator (EOM) is used to impose frequency sidebands on a carrier wave for amplitude modulation (AM). The transmitted AM beam is detected using a fast photo-receiver and displayed on a digital scope.
Experimental results of (a) attenuation vs modulation frequency, revealing the absorption dip due to coherent population oscillation, and (b) time delay vs modulation frequency.
(Color online) (a) Power dependence of the time delay at various modulation frequencies. (b) Off-resonant modulation trace and resonant modulation traces at and 8 mW demonstrating controllable delay.
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