Sum-Frequency and Difference-Frequency Modulation of Time-Delayed Four-Wave Mixing in Alkali Vapors.

D. DeBeer

D. DeBeer, L. G. Van Wagenen, Raymond John Beach +1 more

D. DeBeer, Eric W. Usadi, Sven R. Hartmann

Transient time‐delayed four‐wave mixing (TDFWM) experiments have been performed on the Na D doublet and modulations of 980 attoseconds have been observed. This period corresponds to the sum frequency of the two Na D lines. The experiments were performed using 7 ns pulses of light with frequency components at each of the D‐line transitions. The effects of superposition‐state modulations are observed in the integrated TDFWM signal as a function of the time delay. As the time delay is varied, the lowest diffraction order mixing signal is modulated. Higher diffraction order mixing signals contain modulation components at integral multiples of the beat frequency.

D. DeBeer, Eric W. Usadi, Sven R. Hartmann

Transient, time-delayed, four-wave mixing (TDFWM) experiments have been performed on the Na D doublet with use of a novel angled-beam geometry. The effects of petahertz superposition-state modulations have been observed in the integrated TDFWM signal as a function of the time delay. As the time delay is varied, the lowest-order mixing signal modulates with a period of 980 as---corresponding to the sum frequency of the two Na D lines. Higher-diffraction-order mixing signals contain modulation components at integral multiples of the doublet sum frequency.

David S. Glassner

Takashi Nakajima