论文部分内容阅读
:利用提拉法生长出大尺寸、高质量的激光自倍频晶体Nd∶GdCa4 O(BO3) 3(Nd∶GdCOB) .测量了Nd∶GdCOB晶体的室温偏振透过谱及荧光谱 ,计算了其在 53 0nm和 81 1nm处沿不同主轴的吸收截面 .利用电光调Q -Nd∶YAG激光器 ,首次测试得出晶体位于XY主平面外的 (θ=66.8°,φ =1 3 2 .6°)位相匹配方向的有效倍频系数为2 .1 pm/V ;而在XY主平面内 (θ =90° ,φ =4 6°)的方向为 0 .7pm/V .通过计算和实验比较 ,认为前者位相匹配方向为最佳倍频方向 .用钛宝石连续激光器对这两个方向的样品进行自倍频实验 ,在52 0mW的输入功率时获得绿光输出为 1 1 .3mW ,光 -光转换效率为 2 .3 % ,激光阈值低于 1mW .目前θ=66.8°,φ =1 3 2 .6°匹配方向在大功率钛宝石泵浦下 ,转换效率可以达到 1 4 .4 % .
: Large-size and high-quality laser self-doubling crystal Nd: GdCa4O (BO3) 3 (Nd: GdCOB) was grown by Czochralski method.Phosphorescence spectra and fluorescence spectra of Nd: GdCOB crystals were measured at room temperature Its absorption cross section along different major axes at 53 0nm and 81 1nm.Using electro-optical Q-Nd: YAG laser, the first test results show that the crystal lies outside the XY plane (θ = 66.8 °, φ = 132.2 ° ), The effective multiplication factor of the phase matching direction is 2.1 pm / V, while the direction in the XY principal plane (θ = 90 °, φ = 46 °) is 0. 7 pm / V. By calculating and experimenting, The former direction of phase matching is considered to be the best frequency-doubling direction.The self-frequency doubling experiments were carried out on the samples in both directions with a sapphire continuous laser to obtain a green output of 11.3 mW at an input power of 5200 mW, The conversion efficiency is 2.3%, and the laser threshold is lower than 1mW. At present, θ = 66.8 °, φ = 132.26 °. The matching direction can be up to 14.4% under the high-power Ti: sapphire pump.