Abstract
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.
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