Abstract.
Exceptionally high values of photorefractive gain coefficient of up to 100 cm-1 have been observed in Fe-doped and Fe/Tb-doped crystals of photorefractive lithium niobate. It is believed that these are the highest observed coefficients of any crystalline photorefractive medium. Accurate measurements of gain coefficient have been possible for the first time by using a specially cut triangular crystal which allows the use of short interaction lengths and the complete elimination of surface reflections by having the beams incident at Brewster’s angle. Experimental results are consistent with a simple model of photorefractive beam coupling up until the onset of noise which is observed to deplete the pump for interaction lengths longer than 1 mm.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 28 September 1998 / Revised version: 8 January 1999 / Published online: 31 March 1999
Rights and permissions
About this article
Cite this article
Cook, G., Finnan, C. & Jones, D. High optical gain using counterpropagating beams in iron and terbium-doped photorefractive lithium niobate . Appl Phys B 68, 911–916 (1999). https://doi.org/10.1007/s003400050723
Issue Date:
DOI: https://doi.org/10.1007/s003400050723