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  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QTuF2

Nonlinear-nonreciprocal spectroscopy of antiferromagnets

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Abstract

Nonreciprocal effects are caused by breaking of time-inversion symmetry. Nonlinear spectroscopy is an excellent tool to study nonreciprocal effects as e.g., antiferromagnetic (afm) ordering, as was recently shown for Cr2O3. Because below Néel temperature (TN) the time-inversion symmetry is broken, one expects physical property tensors, which are time-noninvariant. There is indeed a third-rank tensor χ(2)(c) that changes sign by applying the time-inversion operator T^ . Because applying T^ is equivalent to reversing all spin directions, this change of sign of χ(2)(c) is for 180° domains the same as going from one domain to the other. One can thus do very conveniently domain topography if the change of sign of χ(2)(c) is resolved spatially. The sign of χ(2)(c) can indeed be measured by second-harmonic generation (SHG) if there is at the same time a SH-contribution from a time-invariant χ(2)(i) susceptibility tensor. The reference field due to χ(2)(i) can be created either internally as in the first experiments on Cr2O3 or one can use an external coherent SH field from any noncentrosymmetric crystal that is pumped by the same laser. In order to get a good contrast, one has to be able to adjust the amplitude and the phase of this reference field.

© 1998 Optical Society of America

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