Evaluation of downstream mixing scheme for $9.4 \mu m$ $CO_2$ gas dynamic laser

A theoretical analysis of a downstream-mixing $16-\mu m$ $C0_2$ gasdynamic laser revealed the possibility of utilizing the downstream-mixing scheme for the generation of $9.4-\mu m$ radiation using a $CO_2$, gasdynamic laser. The flow-field has been analyzed using complete two-dimensional, unsteady laminar form of Navier-Stokes equations coupled with the finite rate vibrational kinetic equations. The analysis showed that integrated small-signal gain of $11.5 m^{-1}$ for Lorentzian broadening and $4.8 m^{-1}$ considering Voigt function can be obtained for $N_2$ reservoir temperature of $2000^0K$ and velocity ratio 1:l between the $CO_2$, and $N_2$, mixing streams. These results (presented in graphs) clearly highlight the large potential of downstream-mixing $CO_2$, gasdynamic laser for $9.4-\mu m$ laser generation.