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 (Co:SBN) crystals confirm the occurrence of interference that is achieved for the case of two beams.
© 2007 Optical Society of America
Full Article | PDF ArticleMore Like This
Kotomi Kawakami, Shigeaki Uchida, and Hideki Okamura
Appl. Opt. 51(10) 1572-1580 (2012)
Christian A. Schäfer
Opt. Express 18(13) 13451-13467 (2010)
Shlomi Arnon, Stanly Rotman, and Norman S. Kopeika
Appl. Opt. 36(24) 6095-6101 (1997)