Abstract

In this paper we report a new method to obtain sufficient two wave mixing in Rb:BaTiO₃ using a Bi₁₂TiO₂₀(Bismuth Titanium Oxide) crystal and small power He-Ne laser which, other wise is not possible as the later responds to infrared wavelengths. The BTO crystal is optically active and when placed along the path of a laser beam it rotates its plane of polarization and this rotation increases with respect to length of the crystal. In a conventional two wave mixing geometry the Rb:BaTiO₃ crystal is kept in such a way that the two collimated laser beams are allowed to interfere. When the BTO crystal is kept along one of the paths of interfering beams then the energy of laser beams after mixing inside Rb:BaTiO₃ changes due to the optical activity of BTO. We were able to achieve appreciable wave mixing like undoped BaTiO₃ with small power He-Ne laser.

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