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Elimination of photorefractive grating writing instabilities in iron-doped lithium niobate

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8 Author(s)
Evans, D.R. ; Mater. & Manuf. Directorate, Air Force Res. Lab., Wright-Patterson AFB, OH, USA ; Basun, S.A. ; Saleh, M.A. ; Allen, A.S.
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Two types of instabilities, one slow (seconds) and one fast (nanoseconds), are observed while writing volume gratings in bulk crystals of iron-doped lithium niobate using contra-directional two-beam coupling along the c axis. A method to eliminate the fast instability was achieved by coating the z surfaces of the crystal with either dielectric (anti-reflection) or transparent conductive coatings. For the second case, electrically shorting the crystal eliminated the slow instability.

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Quantum Electronics, IEEE Journal of  (Volume:38 ,  Issue: 12 )