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Phase conjugation apparatus and method of phase conjugating light

University College London, Selviah, D.R., Chang, C.C. (1996) Phase conjugation apparatus and method of phase conjugating light. WO 96/30802. Green open access

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Abstract

3 novel Self pumped configurations and 3 novel mutually pumped configurations for phase conjugation in photorefractive crystals A phase-conjugation apparatus comprises a photo-refractive crystal and means for directing one beam Iin of light in a self-pumped configuration (or a plurality of beams of light in a mutually-pumped configuration) into the crystal so that a phase-conjugation process takes place and a phase-conjugated beam Ipc is returned along the same path as the input beam. In order to enable improvements to be made in the range of input beam positions and/or beam orientations, and/or being the time to reach stability, and/or overall stability, and/or the phase-conjugation efficiency, the input beam is incident on the crystal at an obtuse angle to the direction in which a beam of any orientation would ultimately tend to bend in the crystal, which in the case of a barium titanate crystal equates to the so-called +C direction.

Type: Patent
Title: Phase conjugation apparatus and method of phase conjugating light
Identifier: WO 96/30802
Open access status: An open access version is available from UCL Discovery
Additional information: Imported via OAI, 7:29:01 5th Apr 2007; Imported via OAI, 7:29:00 24th Aug 2007
Keywords: phase conjugation, mutually pumped, self pumped, robust, angular misalignment tolerance, lateral misalignment tolerance, fish head
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/2885
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