Optical Near-Field Phase Conjugation: A Nonlocal DFWM Response Tensor

Duncan G. Steel, Stephen Colby Rand, Jing Liu

We describe detailed studies of the degenerate and nearly degenerate four-wave mixing (DFWM and NDFWM, respectively) response in Cr:YAlO3 of importance to optical phase conjugation. We report on measurements of the DFWM response as a function of pump intensity and wavelength. We also report on measurements of the temporal response of the material and compare the results with the NDFWM response. Finally, we present an analysis of the NDFWM spectral response in the presence of strong pumps.

Fan Rong-Wei, Deying Chen, Fang Tao +3 more

In this paper, frequency-doubled Nd:YAG laser's phase conjugation has been investigated experimentally using resonant degenerate four-wave mixing (DFWM). The iodine solution was used as resonant medium. In this way, the energy of the DFWM phase conjugation beam arrived at 43μJ/pulse while the total pump beam's energy reached 8mJ/pulse. The relation between the pulse energy of the DFWM phase conjugation beam and that of the pump beam was investigated. We also measured the optical field distributions of pump beam and DFWM phase conjugation beam, from which it can be noticed that the DFWM phase conjugation can improve the laser beam quality. At the same time, we observed the influence of the pump beam's disturbance on the DFWM signal.

Robert W. Boyd, G. Grynberg

Lloyd L. Chase, Marion Claude, Daniele Hulin +1 more

Measurements have been made of phas conjugation from degenerate four-wav mixing (DFWM) based on the large nonlinear susceptibility resulting from the two-photo absorption (TPA) resonance of the excitoni molecule state in CuCl. The excitonic molecule in CuCl is a bound state of two exciton that is responsible for a very strong two-photon absorption resonance at a photo energy of 3.186 eV at T ~ 4.2 K.1