Self-pumped, continuous-wave phase conjugation using internal reflection (A)

Chen-Chia Wang, June‐Koo Kevin Rhee, RICHARD A. LINKE

Summary form only given. We have demonstrated optical phase conjugation via four-wave mixing and self-pumped phase conjugation with an external cavity in the DX material CdF/sub 2/:Ga. Room-temperature, low optical power cw operation was achieved by employing plasma gratings with temperature-tunable lifetimes. Phase conjugation reflectivity as high as 50% was demonstrated at the temperature of T=12/spl deg/C in four-wave mixing experiments while a self-pumped phase-conjugation reflectivity of 3% was achieved with the sample placed inside a resonant cavity.

Juan Francisco Lam, Richard C. Lind, Ross A. McFarlane +2 more

R.P.M. Green, Graham J. Crofts, K. Syed +1 more

Shuo‐Xing Dou, Jiasen Zhang, Muyang Wang +2 more

Effects of stimulated photorefractive backscattering (SPB) interactions in both stimulated photorefractive backscattering and four-wave mixing (SPB-FWM) and total internal reflection (TIR) self-pumped phase conjugators have been analyzed theoretically. SPB interactions in the four-wave mixing regions are neglected. Calculations show that the operational threshold and the phase conjugation reflectivity of both phase conjugators are very sensitive to the backscattering two-wave mixing gain coefficient of the crystals. From these results the mechanism transition phenomenon of a self-pumped phase conjugator between SPB-FWM and TIR can be explained if the backscattering gain coefficient of the crystal varies with doping concentration or with wavelength.

Henk F. Arnoldus, Thomas F. George

Celestino J. Gaeta, Jenny Lam, Richard C. Lind

Self-pumped optical phase conjugation has been demonstrated for the first time to our knowledge in a resonant atomic system. This process was implemented by using a single cw pump beam to excite a sodium-vapor oscillator. The counterpropagating optical fields inside this oscillator then combine with the pump beam in an internal fourwave-mixing interaction to yield the phase conjugate of the incident (pump) beam.