Chain Of Non-pulse-discharge Hf Laser

High power electrically-initiated HF pulsed chemical lasers are particularly attractive since they can very efficiently generate high intensity infrared radiation in the 2.5-3.5(m range. We have experimentally found that the optimum E/P value of pulsed HF laser is much higher than that of pulsed CO2 laser. When the discharge becomes arcing, the output energy still increases with the charging voltage. The pulse width decreases with the gas pressure increases. The influence of the peaking capacitor, the component and pressure of mixture gas on the performance of spark preionized pulsed HF laser is investigated. There exists an optimum mixing ratio (SF6/C2H6=20) and an optimum capacitor ratio (Cp/Cs=0.27). Under the condition of optimum mixing ratio, an increase in the charging voltage increases the attainable output energy and the optimal pressure. The laser with active volume 1cm(2cm(56cm has been operated with gas mixture of SF6 and C2H6, giving laser output energy up to 400mJ, the laser peak power up to 1.5MW, the specific laser energy is 31.7J/l(atm, with a maximum technical efficiency about 2.2%. The electrical characteristics of the charge transfer circuits,which are used for the excitation of pulsed gas lasers, are investigated. The formalism that is followed is based on the solution of the differential equations that are obeyed by the currents in the two loops of the circuit. The method can be applied to any type of gas laser using a charge transfer circuit,so that the shape of the voltage and current waveforms can be predicted from the circuit parameters and vice versa. Two important parameters, the resistance and inductance of the discharge plasma can also be solved.