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Updated: May 8, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Three-wave mixing with three incoming waves: signal-idler coherent attenuation and gain enhancement in a parametric
Flavius Schackert1, Ananda Roy, Michael Hatridge
1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06511, USA.
Abstract:
We demonstrate the time-reversed process of nondegenerate three-wave parametric amplification from three distinct sources in the fully nonlinear regime using a Josephson amplifier. In the reverse process, coherent attenuation, signal and idler beams destructively interfere in the presence of a pump to generate additional pump photons. This effect is observed through the symmetric phase-dependent amplification and attenuation of the signal and idler beams and, in the depleted pump regime, through the phase-dependent modulation of the amplifier gain, directly probing the enhancement of the pump. Results are found to be in good agreement with theory.
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