Double phase conjugation in copper-doped potassium sodium strontium barium niobate crystals

Abstract

We show a double phase conjugator with novel crystals of copper-doped potassium sodium strontium barium niobate. The phase conjugation reflectivity can reach 278% and depends on relative input positions of both incident beams. The response time with the input beam power ratio is measured and modeled as a function of input beam power ratio. The formation of the arch coupling loop is analyzed with theoretical simulation results and a positive feedback process is proposed. The influence of a self-pumped phase conjugation process on double phase conjugation fidelity is also discussed. It is necessary to avoid generating self-pumped phase conjugation to prevent the reduction of double phase conjugation fidelity.

Characterization of optical planar waveguide in Ce:KNSBN crystal formed by triple-energy helium ion implantation

“…Doped with active ions with certain concentrations, e.g. cerium (Ce) or copper (Cu), controllable and intriguing photorefractive or ferroelectric properties could be held in this crystal, which is often used for optical data storage and data processing [6,7]. Optical waveguides in KNSBN may have many applications in integrated optics, combined with some other components, e.g.…”