Chinese Optics Letters, 2016, 14 (12): 121902, Published Online: Aug. 2, 2018
Electro-optically tunable self-focusing and self-defocusing in KTP crystals by a cascaded second-order process Download: 530次
190.2620 Harmonic generation and mixing 190.4360 Nonlinear optics, devices 260.5950 Self-focusing 260.1180 Crystal optics
Abstract
We report the transformation of a linear electro-optically tunable non-phase-matched second-order nonlinear process into a cascaded second-order nonlinear process in a bulk KTP crystal to generate the effect of electro-optically tunable Kerr-type nonlinearity. By applying an electric field on the x – y plane, parallel to the z -axis of the crystal, phase mismatch is created, which introduces a nonlinear phase shift between the launched and reconverted fundamental waves from the generated second harmonic wave. Due to the nonuniform radial intensity distribution of a Gaussian beam, a curvature will be introduced into the fundamental wavefront, which focuses or defocuses the incident beam while propagating through the crystal.
Ruma Debnath, Digvijay Singh Hada, Susheel Kumar Beda, Ardhendu Saha. Electro-optically tunable self-focusing and self-defocusing in KTP crystals by a cascaded second-order process[J]. Chinese Optics Letters, 2016, 14(12): 121902.