Applied Physics B

, Volume 68, Issue 5, pp 911–916

High optical gain using counterpropagating beams in iron and terbium-doped photorefractive lithium niobate

Authors

  • G. Cook
    • 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)
  • C.J. Finnan
    • 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)
  • D.C. Jones
    • 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)
Regular paper

DOI: 10.1007/s003400050723

Cite this article as:
Cook, G., Finnan, C. & Jones, D. Appl Phys B (1999) 68: 911. doi:10.1007/s003400050723

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.

PACS: 42.65.Hw; 42.70.Nq
Download to read the full article text

Copyright information

© Springer-Verlag 1999