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High optical gain using counterpropagating beams in iron and terbium-doped photorefractive lithium niobate |
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| Authors: | G Cook CJ Finnan DC Jones |
| Institution: | (1) Defence Evaluation and Research Agency, Lasers and Photonics Department, St Andrew’s Road, Great Malvern, Worcestershire, UK (Fax: 44-1684/896-270, E-mail: garyc@dera.gov.uk), UK;(2) University of Strathclyde, Optical Materials Research Centre, Colville Building, North Portland Street, Glasgow, Scotland (Fax: 44-141/553-4162, E-mail: acp96106@pop-hub.strath.ac.uk), UK |
| 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. Received: 28 September 1998 / Revised version: 8 January 1999 / Published online: 31 March 1999 |
| Keywords: | PACS: 42 65 Hw 42 70 Nq |
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