Abstract

We have developed a new kind of phase conjugator consisting of multimode quartz fibers with core diameters between 50 and 400 μm by using stimulated Brillouin scattering (SBS) in glass fibers as phase-conjugating process. In contrast to commonly used toxic liquids or gases under high pressure as SBS-materials, fibers are harmless to the environment and can be handled easily. Such fiber phase conjugators with a length of more than 2 m were characterized with respect to the phase conjugating parameters like threshold, reflectivity, and fidelity at wavelengths of 1064 nm, 532 nm and 355 nm. We achieved reflectivities of more than 60 %, maximum fidelity up to 93 %, and less than 2 kW power threshold. A depolarization of the light could be reduced to less than 0.5 % by proper configuration of the fiber. High power densities of more than 500MW/cm² do not damage the fiber phase conjugator.

© 1997 Optical Society of America