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Conference on Lasers and Electro-Optics

Vector phase conjugation and its implementation in holographic laser resonators

R.P.M. Green, Santiago Camacho-López, Darren Udaiyan, D.H. Kim, Michael J. Damzen

Published Jun 2, 1996• 0 citations
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Abstract

Summary form only given. In this paper, vector phase conjugation (VPC) is demonstrated both in a saturable absorber (Cr/sup 4+/:YAG) and a gain material (Nd:YAG) for the first time, to our knowledge. We present resuits that show that four wave mixing (FWM) in both of these materials can compensate for large polarization aberrations.

Related papers

Vectorial phase conjugation by degenerate four-wave-mixing in a saturable amplifier polymer laser dye

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Summary form only given. Vectorial phase conjugation (VPC) is an effective technique of eliminating phase and polarization aberrations in optical systems. Applications of VPC in visible region include optical image processing and optical computing. We present what we believe the first demonstration of visible vectorial phase conjugator (VPC) in a laser-pumped polymer laser dye Rhodamine 6G in PMMA matrix.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Nov 11, 2002•0 citations

Phase conjugation in Cr^4+:YAG at 106 μm

A. Brignon, J.-P. Huignard

Phase conjugation in a Cr(4+):YAG saturable absorber by degenerate four-wave mixing with nanosecond pulses at lambda = 1.06 mu m is demonstrated for the first time to our knowledge. An experimental phase-conjugate energy ref lectivity of ~2% and an overall eff iciency of ~0.4% are achieved. Because of the presence of absorbing dipoles oriented along specif ic directions, it is shown that the phase-conjugated beam can be made orthogonally polarized relative to the signal beam or to both pump beams with almost no reduction of the energy reflectivity.

Optics Letters•Aug 1, 1996•7 citations

Wave-Mixing and Vector Phase Conjugation by Polarization-Dependent Saturable Absorption in Cr4+:YAG

Michael J. Damzen, Santiago Camacho-López, R.P.M. Green

We describe a theory of four-wave mixing in the saturable absorber ${\mathrm{Cr}}^{4+}:\mathrm{Y}\mathrm{A}\mathrm{G}$ and compare with experiments performed at 1.064 \ensuremath{\mu}m wavelength. We show that the strong polarization dependence of the saturable absorption along orthogonal crystallographic axes leads to unique polarization properties for wave mixing in ${\mathrm{Cr}}^{4+}:\mathrm{Y}\mathrm{A}\mathrm{G}$. Also there are a range of conditions that lead to vector phase conjugation of the polarization state of a signal beam. Optimum reflectivity for vector phase conjugation occurs when the pump beams have either orthogonal circular polarizations or parallel linear polarizations at 45\ifmmode^\circ\else\textdegree\fi{} to the crystallographic axes. The latter case is unique to this type of nonlinearity.

Physical Review Letters•Apr 15, 1996•19 citations

Phase conjugation by saturable-gain degenerate four-wave mixing in solid state laser media

A. Brignon, Jean‐Pierre Huignard, Henri J. Rajbenbach

We present a method to achieve phase conjugation based on saturable-gain degenerate four- wave mixing in the laser medium itself. Experimental and theoretical investigations show that phase conjugate reflectivities and efficiencies higher than 100% can be achieved with such an interaction. High conjugate-reflectivity at (lambda) equals 1.06 micrometers is demonstrated in conventional flash-pumped Nd:YAG amplifiers and in compact diode-pumped Nd:YVO4 amplifiers.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Apr 11, 1996•2 citations

Polarization Properties of Nonlinear Optical Materials

Michelle S. Malcuit, Robert W. Boyd, Daniel J. Gauthier +2 more

Nonlinear optical interactions can depend in a complicated manner on the state of polarization of the incident optical waves. For the case of isotropic nonlinear optical materials, the third order nonlinear polarization is expressed in terms of two parameters A and B describing the material system and can be written as1,2 (1) where E → is the total field incident upon the medium. In this paper we present the results of investigations of the polarization properties of phase conjugation by degenerate four-wave mixing (DFWM) in fluorescein-doped boric acid glass and in sodium vapor utilizing the 3S1/2→6S1/2 two-photon allowed transition. We find that these two materials can be used for a vector phase conjugation. Vector phase conjugation (VPC) corrects for both wavefront and polarization distortions upon double pass through an aberrating medium.3

Nonlinear Optical Properties of Materials•Jan 1, 1988•0 citations

Experimental investigation of vector phase conjugation in Nd^3+:YAG

R.P.M. Green, Santiago Camacho-López, Michael J. Damzen

We present a study of vector phase conjugation based on degenerate four-wave mixing in inverted Nd:YAG. The results demonstrate polarization correction for weak probe strength, with near-unity fidelity for polarization compensation of the returning conjugate. As the probe strength is increased, the fidelity of the polarization state of the conjugate is seen to deteriorate to an average value of 92% when the probe is strongly saturating and is several times stronger than the pump beams. We also show that, for strong probe strengths, an individual transmission grating or reflection grating is more efficient than when both gratings are present.

Optics Letters•Aug 15, 1996•11 citations
Phase conjugation in a Cr(4+):YAG saturable absorber by degenerate four-wave mixing with nanosecond pulses at lambda = 1.06 mu m is demonstrated for the first time to our knowledge. An experimental phase-conjugate energy ref lectivity of ~2% and an overall eff iciency of ~0.4% are achieved. Because of the presence of absorbing dipoles oriented along specif ic directions, it is shown that the phase-conjugated beam can be made orthogonally polarized relative to the signal beam or to both pump beams with almost no reduction of the energy reflectivity.
We describe a theory of four-wave mixing in the saturable absorber Cr4+:YAG{\mathrm{Cr}}^{4+}:\mathrm{Y}\mathrm{A}\mathrm{G}Cr4+:YAG and compare with experiments performed at 1.064 \ensuremath{\mu}m wavelength. We show that the strong polarization dependence of the saturable absorption along orthogonal crystallographic axes leads to unique polarization properties for wave mixing in Cr4+:YAG{\mathrm{Cr}}^{4+}:\mathrm{Y}\mathrm{A}\mathrm{G}Cr4+:YAG. Also there are a range of conditions that lead to vector phase conjugation of the polarization state of a signal beam. Optimum reflectivity for vector phase conjugation occurs when the pump beams have either orthogonal circular polarizations or parallel linear polarizations at 45\ifmmode^\circ\else\textdegree\fi{} to the crystallographic axes. The latter case is unique to this type of nonlinearity.
Nonlinear optical interactions can depend in a complicated manner on the state of polarization of the incident optical waves. For the case of isotropic nonlinear optical materials, the third order nonlinear polarization is expressed in terms of two parameters A and B describing the material system and can be written as1,2 (1) where E → is the total field incident upon the medium. In this paper we present the results of investigations of the polarization properties of phase conjugation by degenerate four-wave mixing (DFWM) in fluorescein-doped boric acid glass and in sodium vapor utilizing the 3S1/2→6S1/2 two-photon allowed transition. We find that these two materials can be used for a vector phase conjugation. Vector phase conjugation (VPC) corrects for both wavefront and polarization distortions upon double pass through an aberrating medium.3
We present a study of vector phase conjugation based on degenerate four-wave mixing in inverted Nd:YAG. The results demonstrate polarization correction for weak probe strength, with near-unity fidelity for polarization compensation of the returning conjugate. As the probe strength is increased, the fidelity of the polarization state of the conjugate is seen to deteriorate to an average value of 92% when the probe is strongly saturating and is several times stronger than the pump beams. We also show that, for strong probe strengths, an individual transmission grating or reflection grating is more efficient than when both gratings are present.