以聚叠氮缩水甘油醚(GAP)作为烧蚀靶材,以纳米碳粉和红外染料作为掺杂剂,采用微尺度羽流观测系统对GAP靶材的喷射羽流图像进行了观测,分析了掺杂浓度、靶材厚度及激光烧蚀模式对GAP烧蚀特性和推进性能的影响。结果表明,在激光烧蚀过程中,未掺杂吸收剂的GAP靶材利用率非常低;掺杂纳米碳粉后,靶材的推进性能显著增强,但对靶材厚度的依赖性较强,厚度较薄的掺杂纳米碳粉的GAP适合作为透射式激光烧蚀微推力器的靶材;掺杂红外染料后,聚合物的气化程度显著提高,透射式下厚度对羽流喷射的影响较小。红外染料适合作为反射式激光烧蚀微推力器聚合物靶材的掺杂剂。

The energetic polymer glycidyl azide polymer (GAP) is taken as the ablation target and the nano-carbon powder and infrared dye are taken as dopants. The plume of GAP is observed by the microscale plume observation system, and the influences of doping concentration, target thickness and laser ablation mode on GAP ablation characteristics and propulsion performance are analyzed. The results show that the utilization rate of absorber-undoped GAP is very low in the laser ablation process. The propulsion performance of GAP doped with nano-carbon powder is significantly improved, which is sensitive to the target thickness, and the thin GAP doped with nano-carbon powder is more suitable as the target of laser ablation micro-thruster in the transmission mode. The gasification of polymer doped with infrared dye is substantially improved and the plume is weakly affected by the target thickness in the transmission mode. The infrared dye is considered suitable as the polymer target of the laser ablation micro-thruster in the reflection mode.