高能激光束在线测量系统的光强衰减设计
Optical attenuation design for high energy laser beam on-line diagnostic system
-
摘要: 针对环形光刀取样式高能激光束在线测量系统应用中光电探测器线性饱和功率密度低而被测高能激光功率密度高的特点，采用对取样激光扩束和介质膜衰减片级联衰减的方式，实现了数千倍的线性光强衰减。介绍了环形光刀扫描取样及其扩束衰减原理，并对介质膜衰减片在激光入射角 0°~15° 和功率密度1~1 000 W/cm2条件下的透过率特性进行了分析，用实验验证了该光强衰减设计的有效性。Abstract: Optical attenuation coefficient as low as 10-4~10-3 is needed in the application of the high energy laser beam on-line diagnostic system based on a scanning circular reflector. For the low linear saturation threshold of photoelectric detector, a new and reliable method used in diagnostic system is introduced to attenuate high energy laser power density using multilayer dielectric coating. The principle of the beam sampling and attenuation is presented, and transmission coefficient characteristics of the coating are investigated under laser incidence angle of 0°~15° and power density of 1~1 000 W/cm2. At last, the feasibility of the method is proved by experiments.
-
点击查看大图
计量
- 文章访问数: 2391
- HTML全文浏览量: 261
- PDF下载量: 593
- 被引次数: 0
下载:
