Multiple-conjugation expansion in distortion elimination by phase conjugation

The multiple-conjugation expansion results from a method of phase-conjugate scattering analysis that is convenient in connection with strong aberrators and weak phase conjugators. Based on this expansion, a new proof is obtained of a recently established theorem according to which a complete cancellation of distortion is possible in the absence of gains or losses. The proof makes use of the reciprocity property and of the generalized optical theorem of potential scattering.     

A NEW METHOD TO PREPARE UNIFORM PARTICLES; PRECIPITATION FROM LYOTROPIC LIQUID CRYSTALS

Basic copper sulfate panicles of uniform size and shape were prepared at room temperature by precipitation from a lyotropic liquid crystal of water and Tween 80, a nonionic surfactant.

The size (< 2.5 μm) of the panicles depended on the pH of the aqueous copper salt solution and the precipitation time.

The formation of the basic precipitates at room temperature was due to the presence of polyethylene oxide chains in the aqueous layers, while the narrow size distribution was due to immobilization of panicle nuclei by the rigidity of the liquid crystal.