Abstract
We report the experimental results of the optical beam self-focusing and soliton formation in a photorefractive Fe doped lithium niobate (LN:Fe) crystal caused by a pyroelectric effect. The laser beam at 632.8 nm wavelength and with power of 5 mW and a 10 mm length LN:Fe crystal with the controlled temperature in the range of 10–45C are used. The time evolution of the soliton formation shows approximately two times decrease of the optical beam diameter to ~60 m with simultaneous bending of ~140 m opposite to the crystalline C+-axis. The physical model is developed to explain the experimental results. The generated curvilinear waveguiding channels in the crystal are long-living making them promising for applications.
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