Combustion parametric optimization for all gas-phase iodine laser driven by D(2)/NF(3)/DCl combustion was performed, and an energy transfer channel called self-pooling of NCl(a) catalyzed by NF(a)/NF(b) was presented. The results show that a flow rate ratio of NF(3) and D(2) of 0.8 to 1.5 and DCl and D(2) of >1.5 is necessary for high efficiency of Cl atoms generation. The results also show that NF(a) and NF(b) from the reaction of HN(3) and residual F atoms or from the D(2)/NF(3) combustion have a serious effect on the generation and transport of NCl(a) via the NF(a) direct quenching of NCl(a) or via the catalysis of NF(a)/NF(b) on NCl(a) self-pooling. The generation of NF can be avoided if sufficient DCl was used and the NF(3)/D(2) flow rate ratio was properly controlled.