Fig. 131: Sketch of the cavity with the two active Bragg crystals made in a monolithic device. Photons impinging from the left can be trapped due to transmission T and reflection probabilities R. They exit the cavity with probabilities TT, TRRT...T2R2N for 0, 1...N back-and-forth bounces at t0, t1...tN. They are delayed up to N times the time of flight inside the resonator of 1.0 ns. The mean diffraction angle is adjusted to exactly 180 degrees and the beam paths of multiply reflected photons are superimposed in space.

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