Marangoni Marco, Osellame R, Ramponi R, Takekawa S, Nakamura M, Kitamura K
Opt Express. 2004 Jun 14;12(12):2754-61. doi: 10.1364/opex.12.002754.
Buried waveguides with nearly symmetrical refractive index profile and high homogeneity were obtained by applying the reverse-proton-exchange technique to MgO doped stoichiometric lithium tantalate, a promising nonlinear material due to its low coercive field and high damage threshold. By characterizing several samples fabricated under different experimental conditions, we identified a fabrication procedure in which the annealing and the reverse-exchange processes are performed at the same temperature, and the diffusion of hydrogen ions towards the substrate is negligible during the burial step. These fabrication conditions are simpler than the conventional ones used for lithium niobate. Accurate empirical laws were found, relating the fabrication conditions to the optical parameters.
通过将反向质子交换技术应用于掺氧化镁的化学计量比钽酸锂，获得了具有近乎对称折射率分布和高均匀性的掩埋波导。由于其低矫顽场和高损伤阈值，钽酸锂是一种很有前途的非线性材料。通过对在不同实验条件下制备的几个样品进行表征，我们确定了一种制备工艺，即在相同温度下进行退火和反向交换过程，并且在掩埋步骤中氢离子向衬底的扩散可以忽略不计。这些制备条件比用于铌酸锂的传统条件更简单。我们发现了将制备条件与光学参数相关联的精确经验规律。
