Abstract
By using femtosecond laser direct writing, we have fabricated depressed-cladding waveguides in periodically-poled lithium niobate (PPLN) crystals, with which the second harmonic generation (SHG) of 1064 nm has been realized. The third-order quasi-phase matching (QPM) has been adopted to achieve this SHG process. At optimal QPM temperature (∼94.9 °C), we have studied the guiding properties and SHG properties of waveguides in detail. The maximum conversion efficiency of ∼0.075% has been obtained in our experiment. In addition, it has been found that the mode profiles at 532 nm can be tailored by changing cross-sections of waveguides. This work plays an essential part in creating novel and high-performance frequency converters by using femtosecond-laser-written PPLN depressed-cladding waveguides.
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