Abstract
The observation of the nonlinear four-wave-mixing (4WM) effect in a magnetic solid is reported. The measurements were done with the antiferromagnetic FeF2 (Neel temperature TN = 78.6 K). Ferrous fluoride is an ionic crystal of rutile structure and has been of interest for basic studies on magnetism for many years.1 In the present experiment the electronic transition between the ground A1g and the excited B1g state of the Fe2+ ion has been studied in detail. The generation of light at the frequency ω4 = 2ω1 − ω2 by two incident laser beams at ω1 and ω2 is studied as a function of (ω1−ω2) of the sample temperature and of the laser’s polarization. The data analysis yields the energy, width, and symmetry assignment of the resonance.
© 1983 Optical Society of America
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