부산대학교 도서관

Broadband type 0 (ee-e) and type I (oo-e) quasi-phase-matching (QPM) second-harmonic generations (SHGs) are investigated in 0.5 mol% MgO-doped periodically poled stoichiometric LiTaO3 (0.5 mol% MgO:PPSLT). The group-velocity matching (GVM) fundamental wavelength and corresponding QPM crystal grating period are calculated for temperatures from 20 to 200 C. The SHG bandwidths are obtained at different temperatures. The tuning ranges of GVM fundamental wavelength for type 0 and I QPM are 2.575 − 2.590 μm and 2.497 − 2.712 μm for temperature from 20 to 200 C, respectively. The SHG bandwidths are all around 90 nm at 25 (room temperature), 100 and 200 C at a crystal length of 10 mm for type 0 and I QPM. The influence of temperature on the GVM fundamental wavelength and the SHG bandwidth is larger for type I QPM than that for type 0 QPM.