摘要
采用电子束和气体放电两种激励方式开展重复频率非链式HF激光研究。基于全固态脉冲功率源SPG-200建立了重复频率HF实验装置,探索了产生重频大面积均匀电子束的技术途径,利用法拉第筒对进入激光气室的电子束的轴向均匀性进行了诊断,开展了激光器输出特性研究和重频实验调试,在C2H6∶SF6=0.035,总气压为35 kPa时,激光器输出能量最大约为4.8 mJ,并实现了最高30 Hz的HF激光稳定输出。采用峰化电容及紫外自动预电离技术设计研制了放电激励重频HF激光器,研究了SF6气体放电特性和重频运行稳定性。研究发现SF6气体放电具有典型的辉光放电、电压维持和电弧放电三阶段特征。在充电电压为28 kV,总气压为12 kPa,C2H6含量为8%时,放电激励HF激光器最大脉冲能量约600 mJ,比能量输出达到8.5 J/l,激光器的电光转换效率约为2.5%。该激光器在150 Hz实现了重频输出,首脉冲能量〉500 mJ,在10 Hz时稳定输出能量约为200 mJ。
The repetitive-pulsed non-chain HF lasers initiated by e-beams and fast discharges were studied respectively.The e-beam initiated HF laser characterized by an all-solid-state generator was developed.A large area repetitive uniform e-beam was obtained and the Faraday cup was used to diagnose the uniformity of e-beam into the laser gas cell.The output characteristics of the laser were studied and the maximal energy of 4.8 mJ was obtained with gas mixture C2H6∶SF6=0.035.The e-beam initiated HF laser could operate at the repetition rate of 30 Hz.The discharge initiated non-chain HF laser was designed by using the technologies of peaking capacitor and UV pre-ionizing.The discharge characteristics and stability of SF6 gas in repetition mode were studied.The results show that the discharge includes main discharge（volume discharge） and arc discharge,between which the voltage maintains and no evident discharge is visible.The maximal output energy of 600 mJ is achieved under the condition of 28 kV charging voltage and 12 kPa gas pressure with 8% C2H6.Specific output energy of 8.5 J/l and laser electrical efficiency of 2.5% are obtained.In repetition mode,the laser can operate in the repetition rate from 1 Hz to 50 Hz.The first pulse energy is above 500 mJ,and the stable output energy of the laser at the repetition rate of 10 Hz is about 200 mJ.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2011年第2期360-366,共7页
Optics and Precision Engineering
基金
激光与物质相互作用国家重点实验室基金资助项目(No.SKL110902)
