Zhang Jianxiu, Wang Guiling, Liu Zuoliang, Wang Lirong, Zhang Guochun, Zhang Xin, Wu Yang, Fu Peizhen, Wu Yicheng
Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Opt Express. 2010 Jan 4;18(1):237-43. doi: 10.1364/OE.18.000237.
New nonlinear crystals Na(3)La(9)O(3)(BO(3))(8) (abbreviated as NLBO) with desired morphologies, high quality and weight exceeding 40g have been grown along different directions, such as [001], [110], and [100], by top-seeded solution growth(TSSG) method. The refractive indices were accurately measured over the full transmission range, and the second-order nonlinear optical coefficients were determined by the Maker fringe technique. The optimal phase-matching (PM) conditions and the corresponding effective nonlinear coefficient were calculated for second harmonic generation (SHG) at different wavelengths. In order to confirm the correctness of our calculation, we also performed the SHG experiments under 1064 and 800 nm pumping, respectively. In addition, we directly compared the SHG performance of NLBO with that of LBO under the same experimental conditions with the 1064 nm pumping source. As the results, a conversion efficiency of 58.3% at 532 nm was obtained for NLBO, and whereas only 21.5% was obtained for LBO, indicating that NLBO is a highly attractive nonlinear material for frequency conversion of pulses into the visible and ultraviolet.
通过顶部籽晶溶液生长（TSSG）法，已沿不同方向（如[001]、[110]和[100]）生长出具有所需形貌、高质量且重量超过40克的新型非线性晶体Na(3)La(9)O(3)(BO(3))(8)（简称为NLBO）。在整个透射范围内精确测量了折射率，并通过Maker条纹技术确定了二阶非线性光学系数。计算了不同波长下二次谐波产生（SHG）的最佳相位匹配（PM）条件和相应的有效非线性系数。为了证实我们计算的正确性，我们还分别在1064和800 nm泵浦下进行了SHG实验。此外，在1064 nm泵浦源的相同实验条件下，我们直接比较了NLBO和LBO的SHG性能。结果表明，NLBO在532 nm处的转换效率为58.3%，而LBO仅为21.5%，这表明NLBO是一种极具吸引力的用于将脉冲频率转换为可见光和紫外光的非线性材料。
