Discharge pumped non-chain repetitively pulsed HF laser

Abstract

The design and performance of a closed cycle, repetitively pulsed HF laser is described. The homogeneous glow discharge is formed with UV pre-ionization and transverse discharge structure. The optimal output parameters of single pulse operation are given by the investigation of discharge characteristics in SF 6 /C 2 H 6 gas mixture and output characteristics of laser pulse. The repetitively pulse energy stability of laser device are checked with different conditions of gas flowing velocity, charging voltage and total pressure of gas mixture. It is shown that the maximal output energy of laser pulse of 0.6J, peak power 3MW are obtained. Total efficiency of laser device is about 2.4%. When the gas mixture circulating with 4m/s flowing velocity, the maximal running frequency of 50Hz are obtained and operating stability keep well. Under these conditions, the laser pulse energy keeps stable and the average output power is 18W.

Pulse energy sustainability of a burst mode closed-cycle pulsed HF chemical laser

“…Empirical values of related parameters, including the H atom generation coefficient m and the de-excitation ratio β, are obtained with m = 1.90 and β = 0.32 through experiments and tests with a closed-cycle, 500 mJ pulsed HF laser system previously reported in [30,31]. The average number of laser photons emitted from one HF E molecule η = 2.11 is derived with the energy distribution characteristics of different HF E molecules given in [32] for the F + C 2 H 6 reaction system.…”

Discharge initiated high power repetitively pulsed HF/DF laser

“…The system structure and experimental procedures are generally identical to those of our previous works [5][6][7] , so that only some relevant points will be touched below. The transverse excitation electric discharge structure with UV pre-ionization is designed to create suitable conditions for forming the glow discharge.…”