One-dimensional laser beam steering using frequency detuning in two - wave mixing with a BaTiO3 crystal

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Date
2000
Authors
Dharmsaktu, K S
Joseph, Joby
Kehar Singh
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Abstract
We demonstrate a method of one-dimensional laser beam deflection using frequency detuning in two-wave mixing. Energy exchange between the interfering beams in a photo-refractive BaTiO 3 crystal has been used for deflection of a pump beam into predetermined probe beam directions. A one-dimensional array of several beams is generated from a single probe beam, employing a piezo-mirror and beam splitter combination. Probe beams so produced are detuned by exciting the piezo-mirror with a periodic near-saw-tooth voltage so as to produce running fringes. However, stable holographic gratings are recorded by matching the frequency of the probe beam with that of a pump beam reflected from another vibrating piezo-mirror, thereby controlling the direction of beam deflection.
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Keywords
Photorefraction, Two-beam coupling, Beam steering
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