Abstract: Disclosed herein is a CO2-N2-He gas dynamic laser. The operation of a gas dynamic laser involves heating the gas, rapidly cooling that gas in a supersonic nozzle, flowing the gas through an optical cavity wherein stimulated emission (lasing) takes place, and exhausting the gas. Isentropic equations are used to find flow properties throughout the nozzle and diffuser from the properties at their inlets in order to produce a Shock-Free minimum length nozzle.