High-modulation-depth effects in photorefractive wave mixing: influence on pattern formation and physical foundations Academic Article

abstract

• Spatio-temporal pattern formation in contra-directional two-wave mixing in photorefractive crystals is investigated both numerically and analytically, taking high-modulation-depth effects into account. We use a modified two-wave-mixing model that includes a correction function f(m), which is introduced as a phenomenological modification. Transverse instabilities arise only if the modulation depth at one side of the crystal is high (near unity). Therefore, high-modulation-depth effects are both relevant and important. In the near field, transverse running waves appear above the instability threshold. The gain of the signal beam then exhibits an unexpected saturation. Furthermore, the physical justifications of the correction function f(m) are investigated by exactly integrating the nonlinear Kukhtarev equations. We do not neglect the phases of the counter-propagating beams. For static gratings we obtain real and superlinear correction functions, whereas for running gratings they change to complex correction functions. 2003 Elsevier Science B.V. All rights reserved.

authors

• Belic, Milivoj

published proceedings

• OPTICS COMMUNICATIONS

author list (cited authors)

• Pauly, F., Sandfuchs, O., Kaiser, F., & Belic, M. R.

citation count

• 2

complete list of authors

• Pauly, F||Sandfuchs, O||Kaiser, F||Belic, MR

publication date

• April 2003

publisher

• Elsevier  Publisher

published in

• Optics Communications  Journal

keywords

• High Modulation-depth Effects
• Nonlinear Optics
• Photorefractive Effect
• Spatio-temporal Dynamics
• Transverse Instabilities
• Two-wave Mixing

Digital Object Identifier (DOI)

• 10.1016/S0030-4018(03)01232-X

start page

• 385

end page

• 407

volume

• 218

issue

• 4-6

URL

• http://dx.doi.org/10.1016/s0030-4018(03)01232-x