Abstract
The low gain nature of HF overtone chemical lasers has heretofore limited the devices to low magnifications on the order of 1.5. In this paper analyses are presented that show a phase step mirror resonator can enhance modal feedback in these devices such that operation at magnifications of at least 3 is possible. The mechanism for this feedback enhancement is destructive interference of the output wave causing confinement of the beam around the resonator axis. It is shown that the radius of the phase step for optimum performance is directly related to the resonator geometry. It is also seen that the phase step technique increases sensitivity of the resonator to misalignments. The analyses include both two and three-dimensional physical optics calculations complete with rotational non-equilibrium chemical laser gain.
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