Critical slowing-down in photorefractive scattering below the self-oscillation threshold

Author

Jullien, P. ; Mathey, P. ; Odoulov, S. ; Shinkarenko, O.

Author_Institution

Lab. de Phys., Bourgogne Univ., Dijon, France

fYear

2000

fDate

10-15 Sept. 2000

Abstract

Summary form only given. Summary from only given. Photorefractive crystals may generate new optical beams of the same frequency as a pump wave if the appropriate optical feedback is ensured with external mirrors or with a special choice of the pump beam orientation. The onset of oscillation in these coherent oscillators is similar either to the second order phase transition or first order phase transition. We report on the study of the threshold behaviour of the semilinear coherent oscillator with two counterpropagating pump waves. The beam of an Ar+-laser (0.51 /spl mu/m) is used to pump a 3.6-mm thick BaTiO/sub 3/ sample (PRC).

Keywords

barium compounds; mirrors; optical feedback; optical pumping; optical resonators; photorefractive materials; solid-state phase transformations; 0.51 mum; 3.6 mm; Ar; BaTiO/sub 3/; BaTiO/sub 3/ sample; coherent oscillators; counterpropagating pump waves; critical slowing-down; external mirrors; first order phase transition; optical feedback; photorefractive crystals; photorefractive scattering; pump beam orientation; pump wave; second order phase transition; self-oscillation threshold; semilinear coherent oscillator; threshold behaviour; Crystals; Frequency; Laser excitation; Mirrors; Optical beams; Optical feedback; Optical scattering; Oscillators; Photorefractive effect; Photorefractive materials;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics Conference, 2000. Conference Digest. 2000 International

Conference_Location

Nice, France

Print_ISBN

0-7803-6318-3

Type

conf

DOI

10.1109/IQEC.2000.907840

Filename

907840