多模光纤激光器实现高功率低阶模输出

采用光纤缠绕的方法，来抑制大模场面积（LMA）双包层光纤激光器中的高阶模振荡。将光纤缠绕至两种不同半径，实验测量了相应条件下激光器的输出功率和光束质量因子M2。缠绕半径为165mm时，输出功率为217W，M2为2.96；缠绕半径为52mm时，输出功率为160W，M2为1.38。光纤激光器相应的斜率效率分别为60％和48％。光纤缠绕半径较小时，虽然激光器输出功率减小，但其亮度是大缠绕半径时对应值的3.4倍。

Property studies of optical waveguide formed by 6.0 MeV carbon ion implantation into Nd : silicate glass

Nd:silicate glass was implanted at room temperature by 6.0 MeV C3+ ions with a dose of 2.0 x 10(15) ions cm(-2). A waveguide with thickness of about 6.3 mu m was formed. The prism-coupling method was used to observe the dark modes of the waveguide at 633 nm and 1539 nm, respectively. There are three dark modes at 633 nm, of which one is the enhanced-index mode. The propagation loss of the enhanced-index mode in the waveguide measured at 633 nm is 0.42 dB cm(-1) after annealing at 217 degrees C for 35 min. The reflectivity calculation method was applied to simulate the refractive index profiles in the waveguide. The mode optical near-field output at 633 nm was presented.

Co^2＋，Er^3＋：Y3Al5O12晶体的生长及其吸收特性

应用中频感应提拉法成功生长出新型的Co^2＋，Er^3＋：Y3Al5O12晶体。研究了室温下晶体的吸收光谱性能。结合Er^3＋：Y3Al5O12晶体的光谱，并利用调Q判据对Co^2＋，Er^3＋：Y3Al5O12晶体调Q特性进行了简单的分析。结果表明Co^2＋，Er^3＋：YAG晶体是一种很有潜力的白调Q激光晶体。

退火对ZrO2薄膜微结构及激光损伤阈值的影响

利用电子束蒸发方法在Yb:YAG晶体和熔融石英衬底上沉积单层ZrO2薄膜,分别在673 K和1 073 K的温度下经过12 h退火以后,通过X射线衍射(XRD)分析了薄膜晶相,计算了薄膜的晶粒尺寸;利用表面热透镜技术获得了薄膜的吸收;测量了退火后薄膜的激光损伤阈值.实验结果表明:两种衬底上的薄膜结构受到退火温度和衬底表面结构的影响,高温退火有利于单斜相的形成,含单斜相的ZrO2薄膜具有较高的激光损伤阈值,而由于衬底的吸收,Yb:YAG晶体上薄膜的损伤阈值远小于石英衬底上薄膜的损伤阈值.