Photorefractive nonlinear propagation of single beams in undoped LiNbO3: Self-defocusing and beam break-up
نویسندگان
چکیده
Beam propagation in photorefractive LiNbO3 planar waveguides has been studied at different beam intensities and propagation lengths. Self-defocusing and beam break-up have been observed and explained using BPM simulations under a two-center band transport model. OCIS codes: 190.4390 Nonlinear optics, integrated optics; 190.5940 Self-action effects; 230.7390 Waveguides,
منابع مشابه
High intensity behavior of pyroelectric photorefractive self-focusing in LiNbO3
The formation of self-confined beams using pyroelectric effect is numerically and experimentally studied in photorefractive LiNbO3. For a given crystal temperature change, the trapped beam width is shown to be less efficient as intensity is increased. Numerical calculations reveal that the induced refractive-index profile varies along propagation for large intensities due to a nonlinear photovo...
متن کاملPropagation of Incoherently Coupled Soliton Pairs in Photorefractive Crystals and their Self-Deflection
Propagation of incoherently soliton pairs in photorefractive crystals under steady-state conditions is studied. These soliton states can be generated when the two mutually incoherent optical beams with the same polarization and wavelength incident on the biased photorefractive crystal. Such soliton pairs can exist in bright-bright, dark-dark, gray-gray as well as in bright-dark types. In this p...
متن کاملMeasurement of the Nonlinear Refractive Index of LiNb03 by Z-scan Technique
Nonlinear refractive index, n of an undoped z-cut photorefractive LiNbO3 crystal has been investigated here by the Z-scan technique using a continuous wave (cw) laser beam from a multiline argon-ion laser. Here both the sign and magnitude of the measured n are considerably different from the reported z-scan result in LiNbO3 obtained with picoseconds pulsed laser at 532 nm but in good agreement ...
متن کاملPropagation of light beams in anisotropic nonlinear media: From symmetry breaking to spatial turbulence.
Propagation and spatial evolution of light beams in nonlinear media is a central topic of nonlinear optical dynamics. There has been continuing interest in this topic since the initial investigations of self-trapping of light beams in nonlinear media @1,2#. Analysis of the stability and nonlinear evolution of solitary-wave solutions of nonlinear propagation equations is one of the most crucial ...
متن کاملNonlinear beam steering by fractional vortex dipoles
Propagation of optical beams in nonlinear media NLM has been a subject of continuing interest for more than 4 decades due to the possibility for creation of reconfigurable waveguides through the intensity-dependent refractive index change 1,2 . Such optically induced waveguides can guide weak signal beams and pulses 3,4 , which motivates the investigation of novel techniques for manipulation of...
متن کامل