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Modulated OPC signal experimental setup in saturable absorber solid thin films. BS1 to BS4 are beam splitters, M1 to M8 are mirrors, M3 is a piezomirror, L1 is the lens, P1 and P2 are pump beams, P3 is a probe beam via the piezomirror with the applied frequency, P4 is the OPC beam, and BD is a beam dump.
Optical phase-conjugate signal in degenerate four wave mixing with the piezomirror off (a) and with the piezomirror on. OPC-NDFWM signal in rhodamine 110 doped BAG thin films at frequency detunings (b) , (c) , and (d) at ; the incident ratios of the beam intensities are and . Triangular voltage applied to the piezoelement to upshift (positive slope, ) and downshift (negative slope, ). The frequency of probe beam P3 is shown in curve (e).
Normalized OPC reflectivity (a.u.) vs frequency of probe beam, experimental results (dotted points) and Lorentz fitted (solid line), for the condition that beams P1, P2, P3, and P4 are coherent.
Simultaneous measurement of intensities of all four beams with the beam P1 coherence destroyed. The traces marked by correspond to detuning frequency and those marked by + correspond to .
Normalized OPC reflectivity (a.u.) vs detuning frequency, numerically calculated data (solid line) and experimental data (+), corresponding to the signals in Fig. 4 .
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