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Optics Letters

Very high-gain two-wave mixing in BaTiO_3 with a self-bent pump beam

A. Brignon, Sebastien Breugnot, J.-P. Huignard

Published Aug 15, 1995• 14 citations
Publisher

Abstract

We propose a two-wave mixing interaction between a self-bent pump beam and a signal beam in a BaTiO3 crystal. This new configuration exhibits two-wave mixing gain values as high as Gsat = 1.5 × 105, corresponding to an enhancement of 40× in comparison with a conventional two-wave mixing geometry. Application to coherent image amplification with such a high gain combined with a very good signal-to-noise ratio is demonstrated.

DOI
10.1364/ol.20.001689

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Frontiers in Optics•Jan 1, 2007•0 citations
We propose a two-wave mixing interaction between a self-bent pump beam and a signal beam in a BaTiO3 crystal. This new configuration exhibits two-wave mixing gain values as high as Gsat = 1.5 × 105, corresponding to an enhancement of 40× in comparison with a conventional two-wave mixing geometry. Application to coherent image amplification with such a high gain combined with a very good signal-to-noise ratio is demonstrated.
Low noise image amplification owing to contradirectional two-wave mixing (CTWM) is proposed and demonstrated in Rh-doped BaTiO 3 crystal. Comparing with the conventional forward two-wave mixing scheme, an enhancement of signal-to-noise ratio in the order of 10 3 is obtained. The theoretical analyses are presented and give a reasonable explanation for the experimental results. The further discussion shows that CTWM scheme can also reduce the influence of the crystal absorption and crystal size on the two-wave mixing process to rise the signal beam gain.
Two-wave mixing in photorefractive crystals has been shown to combine coherently a modulated optical signal beam with a strong pump optical field.’ For a phase-modulated signal beam, the induced index of refraction phase grating inside the crystal yields a coupling of the optical fields of the pump and signal so that subsequent intensity detection results in apparent intensity modulation of the transmitted signal or pump beams. This provides an easy way to detect phase differences between two optical beams. Some of the advantages the above scheme offers over commonly used coherent optical phase detection schemes are: no loss of 3 dB in the signal beam intensity at the 50/50 beam splitter (used to combine signal and local oscillator fields); automatic alignment of the index of refraction grating with the two incident optical wavefronts; insensitivity to slow random changes in the phases of both beams. Experimental results are given, and a new definition for the resulting mixing gain for the phase-modulated beam is introduced, through which optimal conditions for input beam intensity ratios can be found. Applications to coherent homodyne detection are discussed.
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.