以GT-wave光纤为代表的泵浦增益一体化复合功能激光光纤是分布式侧面泵浦光纤技术的典型代表。GT-wave复合功能激光光纤具有良好的结构扩展性,泵浦注入路数可递增,泵浦光注入吸收和信号光增益放大都自然而均匀地实现,可有效热管理,转换效率高,稳定性好。英国SPI公司和美国IPG公司均采用此类光纤用于kW级高功率光纤激光器的研究和生产,我国相关研究单位也在逐步进入此研究领域并取得了初步进展。

The disk electrode of a gas switch with different materials is studied by self-breakdown experiment in slightly uneven electric field. In the self-breakdown experiment, the gap length and the gas pressure of the switches are identical .The gap length is 5 mm and the gas pressure is 0.25 MPa, so the self-breakdown voltage of each switch is almost 40 kV. Stainless steel, brass, tungsten-copper alloy and graphite are studied in the experiment. The differences of switch performance, like static performance, electrode mass loss and electrode surface, are compared in the research.The experiment result shows that the probability of self-breakdown at low working ratio of the graphite electrode switch is much lower than the others of metal material electrode switches. There is little difference of the static performances among the metal electrode switches. Mass loss of graphite electrode is higher than that of other electrodes. But, because most of the graphite ablation production is gas, the insulator of the graphite electrode switch is polluted much more lightly than that of others.The ablation of the tungsten-copper alloy electrode is lighter than that of others.