Proceedings PaperEffect of velocity cross-relaxation and mode separation upon the power spectrum of a chemical oxygen-iodine laser resonator
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A gain model for optical extraction from the CW chemical oxygen-iodine laser medium is described. It uses a simplified, temperatuire-dependent, chemical kinetics package which consists of several reactions between molecular oxygen, atomic and molecular iodine, water, and helium. The Heidner I2 dissociation mechanism is included to allow for incomplete dissociation. Gas flow is treated using a premixed, one-dimensional stream-tube model which accounts for gas expansion and heat release in the cavity. Collisional cross-relaxation effects upon the Doppler-broadened line are treated using a Fokker-Planck diffusion model of the velocity distribution of the upper and lower laser levels. This model, in conjunction with geometric optics, multimode model of an unstable standing-wave confocal resonator, is used to examine the influence of incomplete velocity cross-relaxation and longitudinal mode separation upon the output power and mode spectrum of the laser. It is shown that lasing will occur on all available modes even when the mode separation is less than the collision linewidth.