# Analysis of a cascade-pumped 16 $\mu$m $CO_2-N_2$ downstream-mixing gasdynamic laser

Chakravarty, Purandar and Reddy, NM and Reddy, KPJ (1990) Analysis of a cascade-pumped 16 $\mu$m $CO_2-N_2$ downstream-mixing gasdynamic laser. In: Applied Physics Letters, 57 (9). pp. 852-854.

The generation of a 16 µm laser beam through cascading in a downstream-mixing $CO_2$ gasdynamic laser is studied. To simulate actual lasing action, a generalized, two-dimensional, flow-radiation-coupled power extraction model for a gasdynamic laser is used. Also, to model the cascade process a new four-mode $CO_2-N_2$ vibrational kinetic model has been proposed. The steady-state intensity obtained for an exclusive 9.4 $\mu$m transition is of the order of $5\times10^7 W/m^2$. In the cascade mode of operation the steady-state intensities for 9.4 and 16 $\mu$m transitions of the order of $5\times10^7 W/m^2$ and $1.0\times10^6 W/m^2$, respectively, have been obtained.