This article is cited in 3 papers

Integrated optics

Conversion of spectral characteristics of laser radiation in periodic domain structures written by the electron-beam method in planar waveguides formed by Ti diffusion in Y-oriented LiNbO₃

S. M. Shandarov^a, L. S. Kokhanchik^b, T. R. Volk^c, E. N. Savchenkov^a, M. V. Borodin<sup>a

a</sup> Tomsk State University of Control Systems and Radioelectronics
^b Institute of Microelectronics Technology and High-Purity Materials RAS
^c Institute of Cristallography Russian Academy of Sciences, Moscow

Abstract: Periodic domain structures for nonlinear conversion of spectral characteristics of laser radiation in the planar Ti : LiNbO₃ waveguide have been formed by the method of electron-beam writing. Domain gratings with a spatial period of 6.50 μm formed in the Y-cut plate over a wide range of accelerating voltages have been visualised by the method of second harmonic generation microscopy (SHG-microscopy) in transmitting geometry and at waveguide excitation. It is found that the domain structure written at an accelerating voltage of 10 kV in a waveguide with an exponential refractive index profile and an effective thickness of 1.75 μm is characterised by high homogeneity. It is composed of continuous domain rows and provides near-quasi-phase-matching radiation conversion at a wavelength of 1053 nm into the second harmonic for the TE₀ → TE₁ waveguide process.

Keywords: periodic domain structures, diffusion planar waveguide, lithium niobate, SHG microscopy, waveguide quasi-phase-matching SHG.

Received: 24.04.2018
Revised: 21.06.2018

 English version: Quantum Electronics, 2018, 48:8, 761–766

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