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Up to 2.8 nm of filtering bandwidth was achieved with a simple temperature-gradient-control technique in a 78-mm-long Ti-diffused periodically poled LiNbO3 (Ti:PPLN) waveguide, which has a 0.2-nm wavelength filtering bandwidth at an uniform temperature.
All-optical wavelength tuning in a waveguide-type Solc filter based on a Ti:PPLN waveguide has been demonstrated for the first time by ultraviolet illumination. The measured wavelength tuning rate as a function of the UV intensity was about -26.42 nm/W cm-2.
We have analyzed the wavelength filtering characteristics in a periodically poled Ti:LiNbO3 (TkPPLN) waveguide depending on wave-guiding mode. In single-mode guiding condition, we have observed a single wavelength filtering which has about a 0.21 nm bandwidth. We also have observed a dual wavelength filtering in the case of multi-mode guiding condition.
Second-Harmonic generation (SHG) has been demonstrated in a periodically poled lithium niobate (PPLN) waveguide fabricated by femtosecond laser pulses. The measured SHG wavelength was about 1562 nm in a 44.8-mm-long PPLN waveguide.
All-optical AND and NAND gates have been demonstrated in a Ti-diffused periodically poled LiNbO3 channel waveguide which has two second phase-matching peaks by cascaded sum frequency generation/difference frequency generation and sum frequency generation processes.
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