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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1989),
  • paper MAA3

Measurement of the magnitude and phase of χ(3) by means of a new phase conjugate interferometer

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Abstract

We have constructed a new type of phase conjugate interferometer utilizing two conjugate mirrors based on degenerate four-wave mixing. A schematic representation of this interferometer, which in fact is analog to the classical Twyman–Green interferometer, is shown in Fig. 1. The pump and probe beams are split into two by beam splitter 6S and then follow the two paths shown in Fig. 1. After interacting at the phase conjugate mirrors PC, the retroreflected pump beams recombine at the beam splitter. The signal generated by the recombination of the pump beams constitutes the conventional Twyman-Green interferometer, which we designate as a pump interferometer (PI). The phase conjugate interferometer (CI) consists of the two-phase conjugate signals, which Interfere with each other at beam splitter BS. The reflected probe beams also interfere at the beam splitter forming a probe beam interferometer. Therefore, this unique interferometer has three outputs at one side of the Interferometer and three outputs at the other side. The interdependency of the three interferometers as seen in Fig, 1 is such that alignment of any one Interferometer results in the automatic alignment of the others. Using the conjugate interferometer output and pump interferometer output we were able (a) to measure the ratio of χ(3) of the two conjugate media, (b) to determine the relative phase shift between the conjugate signals, (c) to detect weak phase conjugated signals, (d) to measure the fidelity of the conjugate process.1

© 1989 Optical Society of America

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