title: Optical retrodirective tracking system approach using an array of phase conjugators for communication and power transmission.
abstract: A new concept for a retrodirective tracking system applicable for communication and power transmission is proposed. In the proposed concept, the power transmitter utilizes a receiver's pilot signal to obtain information about its direction by conjugating the signal's phase inside a nonlinear medium. Power is therefore transmitted back to the receiver by the phase-conjugated signal beam. The power can be concentrated by an array of phase conjugators, which provides a large aperture so that the intensity can be increased on the receiver's photovoltaic panels compared to a single element. Controlling the phase and the direction of the readout beams in the four-wave-mixing process provides control over the interference pattern, its position, and its size. A numerical analysis is given for the phase and spot size control, and measurements with two Co-doped Sr(x)Ba(1-x)Nb(2)O(6) (Co:SBN) crystals confirm the occurrence of interference that is achieved for the case of two beams.
authors.affiliation: Department of Computer and Systems Engineering, Kobe University, Japan. schaefec@phobos.cs.kobe-u.ac.jp
authors.forename: Christian A
authors.initials: CA
authors.lastname: Schäfer
authors.forename: Osamu
authors.initials: O
authors.lastname: Matoba
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kaya