作　　者： ; ; ; ; ; ; ;

机构地区： 深圳大学光电工程学院光电子器件与系统教育部重点实验室

出　　处： 《红外与激光工程》 2016年第12期54-59,共6页

摘　　要： 研制了基于电子束时间展宽技术和微通道板(microchannel plate,MCP)选通技术的时间展宽分幅相机。相机有三条厚度80 nm、宽度8 mm的微带阴极,阴极上加载斜率为2.1 V/ps的高压斜坡脉冲,使得先发射的电子较后面的电子速度快,经过50 cm的漂移区后,电子束产生时间展宽,从而提高相机时间分辨率。阴极和MCP均加载了脉冲电压,因此,需要精确同步光脉冲、阴极脉冲和MCP选通脉冲,分析了完整的同步过程。当阴极仅加直流电压,无电子束时间展宽时,获得相机的时间分辨率为78 ps。当阴极加载高压斜坡脉冲时,电子束时间展宽技术将系统的时间分辨率提高至12 ps。改变延时,将光脉冲分别同步在斜坡脉冲不同位置,获得了时间分辨率与同步位置的关系。 A dilation framing camera based on the gated microchannel plate （MCP） technology and the time-dilation technology was reported. In the camera, the photo-cathode （PC） was applied with a high voltage fast step pulse with gradient of 2.1 V/ps. The electron pulse generated at the PC was accelerated by a time varying electric field between the PC and the anode mesh, which leads to an energy dispersion of the electron signal. The electrons generated early in time obtain a larger energy. Therefore, the initial electrons transit the drift space between the mesh and the MCP at a higher velocity than those coming later. While the electrons travel through the 50 cm drift space to the MCP, the temporal shape of the electron signal was dilated or temporally magnified due to the time-dilation system. Then, the dilated electron pulse was detected by the gated MCP framing camera. Therefore, the temporal resolution of the framing camera was improved. The camera has three transmission photo-cathodes coated with 80 nm Au.The width of each PC is 8 mm. Both the PC and the MCP were applied with pulse, therefore the laser pulse, the PC pulse, and the MCP pulse should be synchronized accurately. The synchronized process was analyzed. While the PC was applied with dc bias only, the measured temporal resolution of the camera without time-dilation was about 78 ps. While the high voltage fast step pulse was applied on the PC, the temporal resolution was improved to 12 ps. The relationship between the temporal resolution and the synchronized point was also provided.

关 键 词： 分幅相机 时间展宽 时间分辨率 惯性约束聚变 箍缩

领　　域： [电子电信] [理学] [理学]