Growth and optical homogeneity investigations of Fe and Fe:Mn codoped LiNbO3 crystals |
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Authors: | S Kar Sunil Verma M S Khan K S Bartwal |
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Abstract: | Lithium niobate (LiNbO3) crystals doped with Fe and Fe:Mn were grown by Czochralski technique. The doping concentrations of Fe and Mn were optimized. Transmission studies reveal broad absorption band centered at 488 nm. The UV cutoff observed for Fe doped LiNbO3 is 358 nm whereas for Fe:Mn codoped LiNbO3 is 352 nm. This decrease in UV cutoff for Fe and Mn codoped LiNbO3 compared to only Fe doped LiNbO3 is due to the increase in Li/Nb ratio. Optical homogeneity was assessed using conoscopy and birefringence interferometry. Dark and photo conductivity measurements prove that LiNbO3 is a negative photo conducting material. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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Keywords: | lithium niobate Czochralski method doping photorefractive materials |
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