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RESEARCH PRODUCT
Slow light with photorefractive four-wave mixing
Pierre MatheyKonstantin ShcherbinGrégory Gadretsubject
PhysicsCouplingFour-wave mixingOpticsbusiness.industryPhotorefractive effectSlow lightPhase conjugationbusinessAtomic and Molecular Physics and OpticsBeam (structure)Mixing (physics)Pulse (physics)description
A slowing down of light pulses using backward-wave four-wave mixing is achieved in photorefractive crystals with different coupling strength. The delay and width of the output pulse are studied as a function of the input pulse width and pump intensity ratio for the amplified transmitted beam and for the phase-conjugated beam. The delay characteristics are compared with those of the two-beam coupling. It is demonstrated that the four-wave mixing process ensures a larger slowing down of short pulses (pulses with width shorter than the photorefractive response time) as compared to the photorefractive two-beam coupling scheme and guarantees the elimination of forerunners. The delay of long pulses in the four-wave mixing configuration is almost the same as the one that can be reached with two-beam coupling. The effect of absorption on the nonlinear shape transformation of the output pulses is discussed qualitatively.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-12-01 | Physical Review A |