The performance of a pulsed HF chemical laser with an F2/H2 chain reaction system is widely compared to that of an F/H2 non-chain reaction system by using a chemical laser simulation code based on the constant gain method. According to the simulation results, peak power differs little between both systems; laser pulse duration is more than an order of magnitude shorter in the F/H2 system than that in the F2/H2 system; laser pulse energy in the F2/H2 system is greater than that in the F/H2 system; difference in these energies is exponentially proportional to the inverse of the initial fluorine atom concentration; laser pulse energy per mol of HF() produced prior to termination of the lasing differs little between both systems; the thermodynamical efficiency is a decreasing function of the initial fluorine atom concentration in the F2/H2 system while in the F/H2 system it has a maximum value at the certain concentration.

The pulsed HF chemical laser of the HI/SF6 system can be excited to the sixth HF vibrational level, and the spectra of this system coincide with those of the HF chemical laser of the H2/F2 system. The pulsed HF chemical laser of the HI/SF6 system can therefore be used as an oscillator or a preamplifier for the power-amplifier of the H2/F2 system. The power of a pulsed HF chemical laser of the HI/SF6 system is said to be poor in comparison with other mixed systems, but the use of a Blumlein-discharge circuit to initiate the electric discharge proved to be effective. An electrical efficiency of 3.9% for a pulsed HF chemical laser of the HI/SF6 system was obtained, and both the electrical efficiency and the output energy of this laser system were comparable with those of the HI/SF6 system.

A pulsed HF chemical laser of the HI/SF6 system can be used as an oscillator or a preamplifier for the laser power-amplifier system of the H2/F2 system. The HF chemical laser of the HI/SF6 system is predicted to extract more energy than the other mixed systems, but the results of calculations based on a simulation model were not in agreement with experiment. In this paper, our calculation was based on the assumption that the HI molecules dissociated upon the initiation. The pulsed HF chemical laser of the HI/SF6 system is here treated theoretically, utilizing the constant-gain methode by a pulsed chemical laser code. The pulsed HF chemical laser is characterized by the laser output energy, power and pulse width. The calculated results in accordance with the assumption that 1% of SF6 and 25% of HI are dissociated by the electric discharge, are in good agreement with the experimental data for a pulsed HF chemical laser of the HI/SF6 system with the Blumlein-discharge circuit.