「Ferroelectric Domain Control for Polarization-Reversed Optical Devices」Summary of research result

1.“选择性成核”技术的发展。我们在18.7 kV/mm的电场下开发了“选择性成核”，比以往在LN中报道的要低。SN提高了反极化结构的均匀性，提高了激光的波长转换效率2。极化反畴高纵横比。在极化反转参数优化的情况下，获得了250 ~ 300的高长宽比（深度/宽度），在6 ~ 8um周期内获得了1mm的深度，这与商用Nd: YAG激光器在波长转换中产生的绿光相对应。高功率波长转换为绿光。以铌酸锂和钽酸锂（SLT）为原料制备了波长转换器。特别是。在SLT中，我们通过脉冲Nd: YAG激光的二次谐波产生了4.4W的绿光。

1.Development of "Selective Nucleation" techinique.We developed "selective nucleation" at an electric field of 18.7 kV/mm, lower than ever reported in LN. The SN improved the unifromity of polarizartion-reversed strucutures and efficiency in wavelength conversion of laser light.2.High aspect ratio in polarization reversed domains.High aspect ratio (depth/width) of 250-300 were obtained with optimized parameters in polarization reversal and 1mm depth was achieved for 6-8um periods, which correspond to green light generation from a commercial Nd : YAG laser in wavelength conversion.3.High power wavelength conversion to green light.Wavelength converters were fabricated in congruent lithium niobate and stoichiometric lithium tantalate (SLT). and especially. in SLT we demonstrated 4.4W green light through second-harminic generation from a pulsed Nd : YAG laser.