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Experimental setup for the nonlinear interferometer. The laser is Ti:sapphire laser which is split into pump1, pump2 and seed beams using PBS (polarization beam splitter) and AOM (acoustic optic modulator). Cell1 and cell2 are the Rb-85 vapor cells which provide the mediums for FWM, i.e., PA process. L and L′ are lenses that constitute the 4f imaging system to make sure the waists of all the beams are same at cell1 and cell2. GL is Glan laser polarizer, GT is Glan-Thompson polarizer, and WP is half wave plate. Finally, the signal and idler fields are detected by photodetector and sent into oscilloscope. Top left: energy level diagram of Rb-85 D1 line for four-wave mixing. Δ is one-photon detuning and δ is two-photon detuning
The interference visibilities of the signal (a) and idler (b) outputs from interferometer given by Eqs. (5) and (6) as a function of G 1 and G2
The relationship between visibility and G 1 with different G 2. (a) and (b) are theoretical simulations from Eqs. (5) and (6) . (c) and (d) are experimental results.
The visibilities of signal interference fringe (blue diamond-dashed line) and idler interference fringe (red diamond-dashed line) as a function of one-photon detuning. The gains of PA1 (green dot) and PA2 (yellow dot) are also shown in this graph.
The visibilities of output signal (blue diamond-dashed line) and idler (red diamond-dashed line) fields as a function of two-photon detuning. The gains of PA1 (green dot) and PA2 (yellow dot) are also shown in this graph.
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