标题：Second harmonic generation of femtosecond laser written depressed cladding waveguides in periodically poled MgO:LiTaO3 crystal
作者：Wang, Lei; Zhang, Xintong; Li, Lingqi; Lu, Qingming; Romero, Carolina; Vazquez de Aldana, Javier R.; Chen, Feng
作者机构：[Wang, Lei; Zhang, Xintong; Li, Lingqi; Chen, Feng] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China.; [L 更多
通讯作者：Wang, Lei;Wang, L
通讯作者地址：[Wang, L]Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China.
摘要：We report on the fabrication of depressed cladding waveguides in periodically poled MgO doped LiTaO3 by using low-repetition-rate femtosecond laser writing, and their use for guided-wave second harmonic generation (SHG). The cladding waveguides exhibit different guiding performance along the extraordinary and ordinary polarizations. The temperature-dependent quasi-phase-matching (QPM) is realized to obtain SHG in the depressed cladding waveguides. The results show that the QPM temperature was dependent on the poling period and on the features of the cladding waveguides. The highest nonlinear conversion efficiency (0.74%W (-1) cm(-2) ) was found in the waveguide fabricated with large scanning velocity (0.75 mm/s) and small radius (15 mu m). (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement