Abstract
We report on the fabrication of ridge waveguides formed in congruent periodically poled lithium niobate (PPLN). The waveguides were fabricated by periodic poling, proton exchange, subsequent annealing and reverse proton exchange followed by diamond blade dicing. Up to 1 W of single-pass second-harmonic generation at 775 nm has been realized in 50 mm long ridge waveguides with internal conversion efficiency of 70%. Furthermore, difference frequency generation at 3.3 μm of two pump waves at 1.05 μm and 1.55 μm has been obtained in similarly fabricated PPLN ridge waveguides with an appropriate poling period.
Highlights
Wide transparency window, excellent electro-optical, acousto-optical and nonlinear properties combined with low-loss waveguides make lithium niobate a material of choice for a wide variety of photonics applications
periodically poled lithium niobate (PPLN) waveguides both with channel and ridge geometries, have been used for generation of mid-infrared (MIR) light in the (3.2 – 4) μm wavelength range through difference frequency generation (DFG) of the two pump waves with wavelengths around 1050 nm and 1550 nm
We report on the first annealed/reverse proton exchanged, diamond blade diced PPLN ridge waveguides with 510 %/W (25 %/Wꞏcm2) conversion efficiency
Summary
Excellent electro-optical, acousto-optical and nonlinear properties combined with low-loss waveguides make lithium niobate a material of choice for a wide variety of photonics applications. Watt-level second-harmonic generation (SHG) outputs, have been demonstrated in PPLN waveguides with relatively low efficiencies of (50 – 100) %/W [3, 4]. PPLN waveguides both with channel and ridge geometries, have been used for generation of mid-infrared (MIR) light in the (3.2 – 4) μm wavelength range through difference frequency generation (DFG) of the two pump waves with wavelengths around 1050 nm and 1550 nm. We report on the first annealed/reverse proton exchanged, diamond blade diced PPLN ridge waveguides with 510 %/W (25 %/Wꞏcm2) conversion efficiency. DFG in the mid-infrared range around 3.3 μm is demonstrated in fabricated PPLN ridge waveguides under 1.05 μm and 1.55 μm pumping
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