Quasi-phase-matched frequency conversion in ridge waveguides fabricated by ion implantation and diamond dicing of MgO:LiNbO_3 crystals

Abstract

We report on the fabrication and second harmonic generation from a periodically-poled MgO-doped lithium niobate ridge waveguide within the telecommunication L-band. The ridge waveguide is fabricated by carbon ion implantation and the following diamond blade dicing method. A normalized second harmonic conversion efficiency of 20.3%W^-1cm^-2 was obtained with a total insertion loss of 4.3dB at wavelength of 1612.7nm. Our analysis shows that at least ~70% of the second-order nonlinearity was preserved after the implantation and thermal annealing process.

Broadband and efficient second harmonic generation in LiNbO3-LiTaO3 composite ridge waveguides at telecom-band

“…The fabrication of low-loss ridged LiNbO 3 waveguides with ultra-smooth sidewalls has been demonstrated using the optical-grade dicing method. [25][26][27] The above experiments proved that our device was experimentally accessible.…”

CW demonstration of SHG spectral narrowing in a PPLN waveguide generating 2.5 W at 780 nm

“…After optimisation and fitting to the measured data in Fig. 3, we determine values of = 0.12 dB/cm, = 0.58 dB/cm, and a = 7.6 pm/V, the being a similar value measured by Wang et al [19]. To show consistency between measured spectra and the ability for our model to predict spectral narrowing; we have plotted measured results from the small and large conversion regimes along with modelling in Fig.…”

Guiding properties of proton-implanted Nd 3+ -doped phosphate glass waveguides

“…[8,9] It has been widely used in the formation and application of optical waveguides. [10][11][12] The energetic irradiation ions lose most of their energy when they slow down in the form of collisions with target electrons and by introducing atomic displacements. [13,14] It causes a negative change in refractive index at the end of the ion track, which is the principle of the ion-implanted waveguide.…”