Phasar nonlinear optical experimentation - Phased far-field return from multiple telescopes by optical wavefront reversal of a reference signal

Details Phasar nonlinear optical experimentation - Phased far-field return from multiple telescopes by optical wavefront reversal of a reference signal Phasar nonlinear optical experimentation - Phased far-field return from multiple telescopes by optical wavefront reversal of a reference signal

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988opten..27..722k&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 27, Sept. 1988, p. 722-729.

Physics

Optics

Far Fields, Nonlinear Optics, Phased Arrays, Signal Processing, Telescopes, Transmitter Receivers, Barium Titanates, Mirrors, Phase Conjugation, Wave Fronts

Scientific paper

A multiple telescope array, Phasar, is used to collect light for a phase-conjugate mirror of barium titanate, forming a hybrid receiving/transmitting system. The observed fidelity of the system output is independent of the type and amount of aberration introduced into the optical path. In all test cases, the measured far-field peak intensity indicates that the fidelity of the return from the three telescopes approaches the fidelity required to yield the ideal in-phase superposition of waves in the far field. The system demonstrates high fidelity phase conjugation for a telescope piston mismatch of up to + or - 5 microns, for tilt error up to + or - 700 microrad, and for higher-order aberrations. A scheme implemented to compensate for depolarizing and polarization-altering effects boosts the amplitude of the point spread function considerably. Near-field diagnostics confirm the fidelity of the phase-conjugate output.

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